Re: [Qgis-user] Symbolizing a discrete or a boolean raster (Stéphane Henriod)

[Paolo Cavallini]

Il 02/02/2017 15:46, Stéphane Henriod ha scritto:
> Dear all
> 
> we have now managed to set up a concrete offer for this feature and are
> now looking for funding. The costs are 4000€ and we have gathered
> 2000-2500€ so far.
> 
> Is there anyone on this list who also craves for this feature and would
> like to financially support it? I can provide any additional info offline.
> 
> Also, given the relatively low costs, I'd prefer to avoid a full-fledge
> crowdsourcing campaign. Too much overhead.

Thanks, quite useful.
I'm spreading the word.
All the best.
-- 
Paolo Cavallini - www.faunalia.eu
QGIS & PostGIS courses: http://www.faunalia.eu/training.html
https://www.google.com/trends/explore?date=all&geo=IT&q=qgis,arcgis
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Re: [Qgis-user] Symbolizing a discrete or a boolean raster (Stéphane Henriod)

[Stéphane Henriod]

t;>>>>> management. See https://github.com/qgis/QGIS/p
>>>>>> ulls?utf8=%E2%9C%93&q=is%3Apr%20discrete%20is%3Aclosed%20 or
>>>>>> https://github.com/qgis/QGIS/pulls?utf8=%E2%9C%93&q=is%3Apr%
>>>>>> 20pseudocolor%20is%3Aclosed%20 but testing upcoming 3.0 shows that
>>>>>> nothing has changed in the area you are interested in.
>>>>>>
>>>>>> Harrissou
>>>>>>
>>>>>> 2017-01-11 4:37 GMT+01:00 Stéphane Henriod :
>>>>>>
>>>>>>> Hi Harrissou
>>>>>>>
>>>>>>> is there any description / documentation of the work that has been
>>>>>>> done on this (feature description, etc.)? If yes, I'd like to have a 
>>>>>>> look
>>>>>>> and maybe
>>>>>>>
>>>>>>> Thanks a lot!
>>>>>>>
>>>>>>> Stéphane
>>>>>>>
>>>>>>>
>>>>>>> Le mardi 10 janvier 2017, DelazJ  a écrit :
>>>>>>>
>>>>>>>> Hi Stéphane,
>>>>>>>>
>>>>>>>> 2017-01-10 4:02 GMT+01:00 Stéphane Henriod :
>>>>>>>>
>>>>>>>>> Hi Chris
>>>>>>>>> this is very nice! I indeed didn't know this trick and will
>>>>>>>>> certainly use it again in the future!
>>>>>>>>>
>>>>>>>>> However... :-)
>>>>>>>>>
>>>>>>>>> I am currently teaching QGIS to beginners and this for sure is not
>>>>>>>>> an appropriate method for them (especially in the case you have to 
>>>>>>>>> generate
>>>>>>>>> the symbology file through a script)!
>>>>>>>>>
>>>>>>>>> Since the user can style continuous rasters with some
>>>>>>>>> "button-clicking", I believe the same option should be available for
>>>>>>>>> discrete rasters as well.
>>>>>>>>>
>>>>>>>>> I am thus wondering if anyone else than me sees it as a priority
>>>>>>>>> for QGIS? If yes, how to motivate the developers to take it for the 
>>>>>>>>> next
>>>>>>>>> release and / or how much would such a development cost? (I 
>>>>>>>>> unfortunately
>>>>>>>>> don't have the competences to do it myself)
>>>>>>>>>
>>>>>>>>> There have been some work done in the raster properties dialog in
>>>>>>>> the upcoming 3.0. I don't know if your concern was covered though.
>>>>>>>> If you want, you can move the question to the developer's list
>>>>>>>> <http://qgis.org/en/site/getinvolved/mailinglists.html#qgis-developers-list>
>>>>>>>> and discuss whether/how this can be implemented (and its requirements).
>>>>>>>>
>>>>>>>> Regards,
>>>>>>>> Harrissou
>>>>>>>>
>>>>>>>> Thanks again and cheers!
>>>>>>>>>
>>>>>>>>> Stéphane
>>>>>>>>>
>>>>>>>>>
>>>>>>>>> Le mardi 10 janvier 2017, Chris House  a
>>>>>>>>> écrit :
>>>>>>>>>
>>>>>>>>>> Hi Stéphane,
>>>>>>>>>>
>>>>>>>>>> I don't know if this is what you are looking for or not but I
>>>>>>>>>> have a method of classifying rasters by color based on a set 
>>>>>>>>>> (standard)
>>>>>>>>>> colors.  I created a spreadsheet that has several required columns, 
>>>>>>>>>> value,
>>>>>>>>>> red, green, blue...and you can have an optional field for a display 
>>>>>>>>>> value.
>>>>>>>>>> So say value 1 is water you can use that last column to name that 
>>>>>>>>>> value so
>>>>>>>>>> that in the QGIS layer tree and in legend it says Water instead of 
>>>>>>>>>

Re: [Qgis-user] Symbolizing a discrete or a boolean raster (Stéphane Henriod)

[Stéphane Henriod]

t;>> Stéphane
>>>>>>
>>>>>>
>>>>>> Le mardi 10 janvier 2017, DelazJ  a écrit :
>>>>>>
>>>>>>> Hi Stéphane,
>>>>>>>
>>>>>>> 2017-01-10 4:02 GMT+01:00 Stéphane Henriod :
>>>>>>>
>>>>>>>> Hi Chris
>>>>>>>> this is very nice! I indeed didn't know this trick and will
>>>>>>>> certainly use it again in the future!
>>>>>>>>
>>>>>>>> However... :-)
>>>>>>>>
>>>>>>>> I am currently teaching QGIS to beginners and this for sure is not
>>>>>>>> an appropriate method for them (especially in the case you have to 
>>>>>>>> generate
>>>>>>>> the symbology file through a script)!
>>>>>>>>
>>>>>>>> Since the user can style continuous rasters with some
>>>>>>>> "button-clicking", I believe the same option should be available for
>>>>>>>> discrete rasters as well.
>>>>>>>>
>>>>>>>> I am thus wondering if anyone else than me sees it as a priority
>>>>>>>> for QGIS? If yes, how to motivate the developers to take it for the 
>>>>>>>> next
>>>>>>>> release and / or how much would such a development cost? (I 
>>>>>>>> unfortunately
>>>>>>>> don't have the competences to do it myself)
>>>>>>>>
>>>>>>>> There have been some work done in the raster properties dialog in
>>>>>>> the upcoming 3.0. I don't know if your concern was covered though.
>>>>>>> If you want, you can move the question to the developer's list
>>>>>>> <http://qgis.org/en/site/getinvolved/mailinglists.html#qgis-developers-list>
>>>>>>> and discuss whether/how this can be implemented (and its requirements).
>>>>>>>
>>>>>>> Regards,
>>>>>>> Harrissou
>>>>>>>
>>>>>>> Thanks again and cheers!
>>>>>>>>
>>>>>>>> Stéphane
>>>>>>>>
>>>>>>>>
>>>>>>>> Le mardi 10 janvier 2017, Chris House  a
>>>>>>>> écrit :
>>>>>>>>
>>>>>>>>> Hi Stéphane,
>>>>>>>>>
>>>>>>>>> I don't know if this is what you are looking for or not but I have
>>>>>>>>> a method of classifying rasters by color based on a set (standard) 
>>>>>>>>> colors.
>>>>>>>>> I created a spreadsheet that has several required columns, value, red,
>>>>>>>>> green, blue...and you can have an optional field for a display value. 
>>>>>>>>>  So
>>>>>>>>> say value 1 is water you can use that last column to name that value 
>>>>>>>>> so
>>>>>>>>> that in the QGIS layer tree and in legend it says Water instead of 
>>>>>>>>> value
>>>>>>>>> 1.
>>>>>>>>>
>>>>>>>>> save the spreadsheet as a csv and change the extension to .txt
>>>>>>>>> instead of .csv.
>>>>>>>>>
>>>>>>>>> I then go into the symbology section of the raster choose
>>>>>>>>> singleband pseudocolor. Use the folder to browse to your text file and
>>>>>>>>> click add.  There is a format for this text file.  It is below.  If 
>>>>>>>>> you
>>>>>>>>> need me to email it I will do that in direct email.
>>>>>>>>>
>>>>>>>>> # QGIS Generated Color Map Export File
>>>>>>>>> INTERPOLATION:EXACT
>>>>>>>>> -,0,0,0,255,NoData
>>>>>>>>> 0,176,176,176,255,Non-Forested
>>>>>>>>> 15,234,255,191,255,10 <=  CC < 20
>>>>>>>>> 25,187,230,149,255,20 <=  CC < 30
>>>>>>>>> 35,140,201,109,255,30 <=  CC < 40
>>>>>>>>> 45,98,176,74,255,40 <=  CC < 50
>&g

Re: [Qgis-user] Symbolizing a discrete or a boolean raster

[Kurt Menke]

Nyall and Alexandre, Thanks so much for the suggestions and reminders! I
contributed this winter as part of the QGIS 3.0 push but would also love to
be able to contribute to a specific enhancement. I’ll work with Stéphane on
this.

Best,

Kurt 

 

**

Kurt Menke, GISP

Bird’s Eye View 

  www.BirdsEyeViewGIS.com 

Work: 505-265-0243

Cell: 505-362-1776

 

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Re: [Qgis-user] Symbolizing a discrete or a boolean raster (Stéphane Henriod)

[Stéphane Henriod]

;>>>>>
>>>>>>> Since the user can style continuous rasters with some
>>>>>>> "button-clicking", I believe the same option should be available for
>>>>>>> discrete rasters as well.
>>>>>>>
>>>>>>> I am thus wondering if anyone else than me sees it as a priority for
>>>>>>> QGIS? If yes, how to motivate the developers to take it for the next
>>>>>>> release and / or how much would such a development cost? (I 
>>>>>>> unfortunately
>>>>>>> don't have the competences to do it myself)
>>>>>>>
>>>>>>> There have been some work done in the raster properties dialog in
>>>>>> the upcoming 3.0. I don't know if your concern was covered though.
>>>>>> If you want, you can move the question to the developer's list
>>>>>> <http://qgis.org/en/site/getinvolved/mailinglists.html#qgis-developers-list>
>>>>>> and discuss whether/how this can be implemented (and its requirements).
>>>>>>
>>>>>> Regards,
>>>>>> Harrissou
>>>>>>
>>>>>> Thanks again and cheers!
>>>>>>>
>>>>>>> Stéphane
>>>>>>>
>>>>>>>
>>>>>>> Le mardi 10 janvier 2017, Chris House  a écrit :
>>>>>>>
>>>>>>>> Hi Stéphane,
>>>>>>>>
>>>>>>>> I don't know if this is what you are looking for or not but I have
>>>>>>>> a method of classifying rasters by color based on a set (standard) 
>>>>>>>> colors.
>>>>>>>> I created a spreadsheet that has several required columns, value, red,
>>>>>>>> green, blue...and you can have an optional field for a display value.  
>>>>>>>> So
>>>>>>>> say value 1 is water you can use that last column to name that value so
>>>>>>>> that in the QGIS layer tree and in legend it says Water instead of 
>>>>>>>> value
>>>>>>>> 1.
>>>>>>>>
>>>>>>>> save the spreadsheet as a csv and change the extension to .txt
>>>>>>>> instead of .csv.
>>>>>>>>
>>>>>>>> I then go into the symbology section of the raster choose
>>>>>>>> singleband pseudocolor. Use the folder to browse to your text file and
>>>>>>>> click add.  There is a format for this text file.  It is below.  If you
>>>>>>>> need me to email it I will do that in direct email.
>>>>>>>>
>>>>>>>> # QGIS Generated Color Map Export File
>>>>>>>> INTERPOLATION:EXACT
>>>>>>>> -9999,0,0,0,255,NoData
>>>>>>>> 0,176,176,176,255,Non-Forested
>>>>>>>> 15,234,255,191,255,10 <=  CC < 20
>>>>>>>> 25,187,230,149,255,20 <=  CC < 30
>>>>>>>> 35,140,201,109,255,30 <=  CC < 40
>>>>>>>> 45,98,176,74,255,40 <=  CC < 50
>>>>>>>> 55,59,153,43,255,50 <= CC < 60
>>>>>>>> 65,0,128,0,255,60 <=  CC < 70
>>>>>>>> 75,15,92,11,255,70 <=  CC < 80
>>>>>>>> 85,17,61,12,255,80 <=  CC < 90
>>>>>>>> 95,16,36,12,255,90 <=  CC <= 100
>>>>>>>>
>>>>>>>> In my example if I don't assign a value it gets ignored by QGIS.
>>>>>>>> If you are wondering how to assign unique colors to say 200 unique
>>>>>>>> values...just script it.  I have done this and as long as you have the
>>>>>>>> number of unique values you want and to make them unique in the script 
>>>>>>>> it
>>>>>>>> works.
>>>>>>>>
>>>>>>>> I hope this helps.  I know it isn't a "button" but to be honest I
>>>>>>>> like this better.  If you already knew this...well then maybe it will 
>>>>>>>> help
>>>>>>>> someone out in the future.
>>>>>>>>
>>>>>>>> --Chris
>>>>>>>>
>>>>>>

Re: [Qgis-user] Symbolizing a discrete or a boolean raster (Stéphane Henriod)

[Stéphane Henriod]

>>>>> <http://qgis.org/en/site/getinvolved/mailinglists.html#qgis-developers-list>
>>>>> and discuss whether/how this can be implemented (and its requirements).
>>>>>
>>>>> Regards,
>>>>> Harrissou
>>>>>
>>>>> Thanks again and cheers!
>>>>>>
>>>>>> Stéphane
>>>>>>
>>>>>>
>>>>>> Le mardi 10 janvier 2017, Chris House  a écrit :
>>>>>>
>>>>>>> Hi Stéphane,
>>>>>>>
>>>>>>> I don't know if this is what you are looking for or not but I have a
>>>>>>> method of classifying rasters by color based on a set (standard) 
>>>>>>> colors.  I
>>>>>>> created a spreadsheet that has several required columns, value, red, 
>>>>>>> green,
>>>>>>> blue...and you can have an optional field for a display value.  So say
>>>>>>> value 1 is water you can use that last column to name that value so 
>>>>>>> that in
>>>>>>> the QGIS layer tree and in legend it says Water instead of value 1.
>>>>>>>
>>>>>>> save the spreadsheet as a csv and change the extension to .txt
>>>>>>> instead of .csv.
>>>>>>>
>>>>>>> I then go into the symbology section of the raster choose singleband
>>>>>>> pseudocolor. Use the folder to browse to your text file and click add.
>>>>>>> There is a format for this text file.  It is below.  If you need me to
>>>>>>> email it I will do that in direct email.
>>>>>>>
>>>>>>> # QGIS Generated Color Map Export File
>>>>>>> INTERPOLATION:EXACT
>>>>>>> -,0,0,0,255,NoData
>>>>>>> 0,176,176,176,255,Non-Forested
>>>>>>> 15,234,255,191,255,10 <=  CC < 20
>>>>>>> 25,187,230,149,255,20 <=  CC < 30
>>>>>>> 35,140,201,109,255,30 <=  CC < 40
>>>>>>> 45,98,176,74,255,40 <=  CC < 50
>>>>>>> 55,59,153,43,255,50 <= CC < 60
>>>>>>> 65,0,128,0,255,60 <=  CC < 70
>>>>>>> 75,15,92,11,255,70 <=  CC < 80
>>>>>>> 85,17,61,12,255,80 <=  CC < 90
>>>>>>> 95,16,36,12,255,90 <=  CC <= 100
>>>>>>>
>>>>>>> In my example if I don't assign a value it gets ignored by QGIS.  If
>>>>>>> you are wondering how to assign unique colors to say 200 unique
>>>>>>> values...just script it.  I have done this and as long as you have the
>>>>>>> number of unique values you want and to make them unique in the script 
>>>>>>> it
>>>>>>> works.
>>>>>>>
>>>>>>> I hope this helps.  I know it isn't a "button" but to be honest I
>>>>>>> like this better.  If you already knew this...well then maybe it will 
>>>>>>> help
>>>>>>> someone out in the future.
>>>>>>>
>>>>>>> --Chris
>>>>>>>
>>>>>>> On Mon, Jan 9, 2017 at 3:00 PM, 
>>>>>>> wrote:
>>>>>>>
>>>>>>>> Send Qgis-user mailing list submissions to
>>>>>>>> qgis-user@lists.osgeo.org
>>>>>>>>
>>>>>>>> To subscribe or unsubscribe via the World Wide Web, visit
>>>>>>>> http://lists.osgeo.org/mailman/listinfo/qgis-user
>>>>>>>> or, via email, send a message with subject or body 'help' to
>>>>>>>> qgis-user-requ...@lists.osgeo.org
>>>>>>>>
>>>>>>>> You can reach the person managing the list at
>>>>>>>> qgis-user-ow...@lists.osgeo.org
>>>>>>>>
>>>>>>>> When replying, please edit your Subject line so it is more specific
>>>>>>>> than "Re: Contents of Qgis-user digest..."
>>>>>>>>
>>>>>>>>
>>>>>>>> Today's Topics:
>>>>>>>>
>>>>>>>>1. Re: Symbolizing a discrete or a boolean raster (Stéphane
>>

Re: [Qgis-user] Symbolizing a discrete or a boolean raster (Stéphane Henriod)

[Nyall Dawson]

t;
>>>>>> Stéphane
>>>>>>
>>>>>>
>>>>>> Le mardi 10 janvier 2017, Chris House  a écrit :
>>>>>>>
>>>>>>> Hi Stéphane,
>>>>>>>
>>>>>>> I don't know if this is what you are looking for or not but I have a
>>>>>>> method of classifying rasters by color based on a set (standard) 
>>>>>>> colors.  I
>>>>>>> created a spreadsheet that has several required columns, value, red, 
>>>>>>> green,
>>>>>>> blue...and you can have an optional field for a display value.  So say 
>>>>>>> value
>>>>>>> 1 is water you can use that last column to name that value so that in 
>>>>>>> the
>>>>>>> QGIS layer tree and in legend it says Water instead of value 1.
>>>>>>>
>>>>>>> save the spreadsheet as a csv and change the extension to .txt
>>>>>>> instead of .csv.
>>>>>>>
>>>>>>> I then go into the symbology section of the raster choose singleband
>>>>>>> pseudocolor. Use the folder to browse to your text file and click add.
>>>>>>> There is a format for this text file.  It is below.  If you need me to 
>>>>>>> email
>>>>>>> it I will do that in direct email.
>>>>>>>
>>>>>>> # QGIS Generated Color Map Export File
>>>>>>> INTERPOLATION:EXACT
>>>>>>> -,0,0,0,255,NoData
>>>>>>> 0,176,176,176,255,Non-Forested
>>>>>>> 15,234,255,191,255,10 <=  CC < 20
>>>>>>> 25,187,230,149,255,20 <=  CC < 30
>>>>>>> 35,140,201,109,255,30 <=  CC < 40
>>>>>>> 45,98,176,74,255,40 <=  CC < 50
>>>>>>> 55,59,153,43,255,50 <= CC < 60
>>>>>>> 65,0,128,0,255,60 <=  CC < 70
>>>>>>> 75,15,92,11,255,70 <=  CC < 80
>>>>>>> 85,17,61,12,255,80 <=  CC < 90
>>>>>>> 95,16,36,12,255,90 <=  CC <= 100
>>>>>>>
>>>>>>> In my example if I don't assign a value it gets ignored by QGIS.  If
>>>>>>> you are wondering how to assign unique colors to say 200 unique
>>>>>>> values...just script it.  I have done this and as long as you have the
>>>>>>> number of unique values you want and to make them unique in the script 
>>>>>>> it
>>>>>>> works.
>>>>>>>
>>>>>>> I hope this helps.  I know it isn't a "button" but to be honest I
>>>>>>> like this better.  If you already knew this...well then maybe it will 
>>>>>>> help
>>>>>>> someone out in the future.
>>>>>>>
>>>>>>> --Chris
>>>>>>>
>>>>>>> On Mon, Jan 9, 2017 at 3:00 PM, 
>>>>>>> wrote:
>>>>>>>>
>>>>>>>> Send Qgis-user mailing list submissions to
>>>>>>>> qgis-user@lists.osgeo.org
>>>>>>>>
>>>>>>>> To subscribe or unsubscribe via the World Wide Web, visit
>>>>>>>> http://lists.osgeo.org/mailman/listinfo/qgis-user
>>>>>>>> or, via email, send a message with subject or body 'help' to
>>>>>>>> qgis-user-requ...@lists.osgeo.org
>>>>>>>>
>>>>>>>> You can reach the person managing the list at
>>>>>>>> qgis-user-ow...@lists.osgeo.org
>>>>>>>>
>>>>>>>> When replying, please edit your Subject line so it is more specific
>>>>>>>> than "Re: Contents of Qgis-user digest..."
>>>>>>>>
>>>>>>>>
>>>>>>>> Today's Topics:
>>>>>>>>
>>>>>>>>1. Re: Symbolizing a discrete or a boolean raster (Stéphane
>>>>>>>> Henriod)
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>> --
>>>>>>>>
>>>>>>>>

Re: [Qgis-user] Symbolizing a discrete or a boolean raster (Stéphane Henriod)

[Alexandre Neto]

ample if I don't assign a value it gets ignored by QGIS.  If you
> are wondering how to assign unique colors to say 200 unique values...just
> script it.  I have done this and as long as you have the number of unique
> values you want and to make them unique in the script it works.
>
> I hope this helps.  I know it isn't a "button" but to be honest I like
> this better.  If you already knew this...well then maybe it will help
> someone out in the future.
>
> --Chris
>
> On Mon, Jan 9, 2017 at 3:00 PM,  wrote:
>
> Send Qgis-user mailing list submissions to
> qgis-user@lists.osgeo.org
>
> To subscribe or unsubscribe via the World Wide Web, visit
> http://lists.osgeo.org/mailman/listinfo/qgis-user
> or, via email, send a message with subject or body 'help' to
> qgis-user-requ...@lists.osgeo.org
>
> You can reach the person managing the list at
> qgis-user-ow...@lists.osgeo.org
>
> When replying, please edit your Subject line so it is more specific
> than "Re: Contents of Qgis-user digest..."
>
>
> Today's Topics:
>
>1. Re: Symbolizing a discrete or a boolean raster (Stéphane Henriod)
>
>
> --
>
> Message: 1
> Date: Mon, 9 Jan 2017 23:07:36 +0600
> From: Stéphane Henriod 
> To: Enrico Fiore 
> Cc: qgis-user 
> Subject: Re: [Qgis-user] Symbolizing a discrete or a boolean raster
> Message-ID:
> <
> cak6pvbxurm_e7drp+8sp9ampuux0+cn3gvxlpnjohhno85o...@mail.gmail.com>
> Content-Type: text/plain; charset="utf-8"
>
> Hi
>
> thanks for following up!
>
> It actually does part of the job!
>
> Using *Color interpretation: Exact*, I can indeed input the exact values I
> want to display (1,5 and 10) and all other pixels are hidden.
>
> HOWEVER,
>
> this still feels like a workaround:
>
>- In the case of a discrete raster with many (> 50) unique values, I do
>not want to input all of them manually
>- In some cases, I do not know in advance all the unique values of my
>raster
>- If I click on *Classify*, QGIS will choose X values (based on the
>number of classes and the classification method (continuous or equal
>interval)), which no longer match the "exact" values of my raster. It
>doesn't really make sense to classify a discrete rendering
>
> So I would say, we still need a render type "discrete raster" which offers
> the function to "retrieve all unique values" (and automatically apply a
> discrete color ramp)
>
> Attached a (fake) test dataset.
>
> Thanks and cheers
>
> Stéphane
>
>
> Le lundi 9 janvier 2017, Enrico Fiore  a écrit :
>
> > Hi,
> > Sorry I can't do test, but if you use exact in color interpolation
> > parameter?
> >
> > Cheers
> >
> > Enrico
>
>
> Le lundi 9 janvier 2017, Stéphane Henriod  a écrit :
>
> > Hi
> >
> > unfortunately this is doing quite something different!
> >
> > If I have a raster with 10 Landcover classes (1,2,3,4,5,6,7,8,9,10) and I
> > want to display only 1,5 and 10, using *Discrete *(1: red, 5: yellow, 10:
> > blue) the following will happen:
> >
> > All pixels between 1 and 4 will be red
> > All pixels between 5 and 9 will be yellow
> > All pixels with 10 will be blue
> >
> > In this sense, the pixels are indeed not interpolated, but this still is
> > not the behavior I am expecting when styling discrete rasters.
> >
> > A "style discrete raster" function should offer the following:
> >
> >- Automatically recover all unique values from the raster
> >- Only display the pixels to which the user has explicitly assigned a
> >color
> >
> > But thanks for your hint, this can be helpful in other cases!
> >
> > Cheers
> >
> > Stéphane
> >
> >
> > Le lundi 9 janvier 2017, Enrico Fiore  > > a écrit :
> >
> >> Hi,
> >> I think that the solution is in the QGIS documentation, that you can
> read
> >> here: http://docs.qgis.org/2.14/en/docs/user_manual/working_with_r
> >> aster/raster_properties.html#band-rendering
> >> you have to use *Singleband pseudocolor *and set color interpolation to
> >> Discrete.
> >>
> >> Enrico
> >>
> >>
> >> Messaggio originale
> >> Da: "Stéphane Henriod" 
> >> Data: 09/01/2017 6.30
> >> A: "qgis-user"
> >> Ogg: [Qgis-user] Symbolizing a discrete or a boolean r

Re: [Qgis-user] Symbolizing a discrete or a boolean raster (Stéphane Henriod)

[Stéphane Henriod]

gt;>>>
>>>>> In my example if I don't assign a value it gets ignored by QGIS.  If
>>>>> you are wondering how to assign unique colors to say 200 unique
>>>>> values...just script it.  I have done this and as long as you have the
>>>>> number of unique values you want and to make them unique in the script it
>>>>> works.
>>>>>
>>>>> I hope this helps.  I know it isn't a "button" but to be honest I like
>>>>> this better.  If you already knew this...well then maybe it will help
>>>>> someone out in the future.
>>>>>
>>>>> --Chris
>>>>>
>>>>> On Mon, Jan 9, 2017 at 3:00 PM, 
>>>>> wrote:
>>>>>
>>>>>> Send Qgis-user mailing list submissions to
>>>>>> qgis-user@lists.osgeo.org
>>>>>>
>>>>>> To subscribe or unsubscribe via the World Wide Web, visit
>>>>>> http://lists.osgeo.org/mailman/listinfo/qgis-user
>>>>>> or, via email, send a message with subject or body 'help' to
>>>>>> qgis-user-requ...@lists.osgeo.org
>>>>>>
>>>>>> You can reach the person managing the list at
>>>>>> qgis-user-ow...@lists.osgeo.org
>>>>>>
>>>>>> When replying, please edit your Subject line so it is more specific
>>>>>> than "Re: Contents of Qgis-user digest..."
>>>>>>
>>>>>>
>>>>>> Today's Topics:
>>>>>>
>>>>>>1. Re: Symbolizing a discrete or a boolean raster (Stéphane
>>>>>> Henriod)
>>>>>>
>>>>>>
>>>>>> 
>>>>>> --
>>>>>>
>>>>>> Message: 1
>>>>>> Date: Mon, 9 Jan 2017 23:07:36 +0600
>>>>>> From: Stéphane Henriod 
>>>>>> To: Enrico Fiore 
>>>>>> Cc: qgis-user 
>>>>>> Subject: Re: [Qgis-user] Symbolizing a discrete or a boolean raster
>>>>>> Message-ID:
>>>>>> >>>>> ail.com>
>>>>>> Content-Type: text/plain; charset="utf-8"
>>>>>>
>>>>>> Hi
>>>>>>
>>>>>> thanks for following up!
>>>>>>
>>>>>> It actually does part of the job!
>>>>>>
>>>>>> Using *Color interpretation: Exact*, I can indeed input the exact
>>>>>> values I
>>>>>> want to display (1,5 and 10) and all other pixels are hidden.
>>>>>>
>>>>>> HOWEVER,
>>>>>>
>>>>>> this still feels like a workaround:
>>>>>>
>>>>>>- In the case of a discrete raster with many (> 50) unique values,
>>>>>> I do
>>>>>>not want to input all of them manually
>>>>>>- In some cases, I do not know in advance all the unique values of
>>>>>> my
>>>>>>raster
>>>>>>- If I click on *Classify*, QGIS will choose X values (based on the
>>>>>>number of classes and the classification method (continuous or
>>>>>> equal
>>>>>>interval)), which no longer match the "exact" values of my raster.
>>>>>> It
>>>>>>doesn't really make sense to classify a discrete rendering
>>>>>>
>>>>>> So I would say, we still need a render type "discrete raster" which
>>>>>> offers
>>>>>> the function to "retrieve all unique values" (and automatically apply
>>>>>> a
>>>>>> discrete color ramp)
>>>>>>
>>>>>> Attached a (fake) test dataset.
>>>>>>
>>>>>> Thanks and cheers
>>>>>>
>>>>>> Stéphane
>>>>>>
>>>>>>
>>>>>> Le lundi 9 janvier 2017, Enrico Fiore  a
>>>>>> écrit :
>>>>>>
>>>>>> > Hi,
>>>>>> > Sorry I can't do test, but if you use exact in color interpolation
>>>>>> > parameter?
>>>>>> >
>>>>>> > Cheers
>>>>&

Re: [Qgis-user] Symbolizing a discrete or a boolean raster (Stéphane Henriod)

[DelazJ]

on, Jan 9, 2017 at 3:00 PM, 
>>>> wrote:
>>>>
>>>>> Send Qgis-user mailing list submissions to
>>>>> qgis-user@lists.osgeo.org
>>>>>
>>>>> To subscribe or unsubscribe via the World Wide Web, visit
>>>>> http://lists.osgeo.org/mailman/listinfo/qgis-user
>>>>> or, via email, send a message with subject or body 'help' to
>>>>> qgis-user-requ...@lists.osgeo.org
>>>>>
>>>>> You can reach the person managing the list at
>>>>> qgis-user-ow...@lists.osgeo.org
>>>>>
>>>>> When replying, please edit your Subject line so it is more specific
>>>>> than "Re: Contents of Qgis-user digest..."
>>>>>
>>>>>
>>>>> Today's Topics:
>>>>>
>>>>>1. Re: Symbolizing a discrete or a boolean raster (Stéphane Henriod)
>>>>>
>>>>>
>>>>> --
>>>>>
>>>>> Message: 1
>>>>> Date: Mon, 9 Jan 2017 23:07:36 +0600
>>>>> From: Stéphane Henriod 
>>>>> To: Enrico Fiore 
>>>>> Cc: qgis-user 
>>>>> Subject: Re: [Qgis-user] Symbolizing a discrete or a boolean raster
>>>>> Message-ID:
>>>>> >>>> ail.com>
>>>>> Content-Type: text/plain; charset="utf-8"
>>>>>
>>>>> Hi
>>>>>
>>>>> thanks for following up!
>>>>>
>>>>> It actually does part of the job!
>>>>>
>>>>> Using *Color interpretation: Exact*, I can indeed input the exact
>>>>> values I
>>>>> want to display (1,5 and 10) and all other pixels are hidden.
>>>>>
>>>>> HOWEVER,
>>>>>
>>>>> this still feels like a workaround:
>>>>>
>>>>>- In the case of a discrete raster with many (> 50) unique values,
>>>>> I do
>>>>>not want to input all of them manually
>>>>>- In some cases, I do not know in advance all the unique values of
>>>>> my
>>>>>raster
>>>>>- If I click on *Classify*, QGIS will choose X values (based on the
>>>>>number of classes and the classification method (continuous or equal
>>>>>interval)), which no longer match the "exact" values of my raster.
>>>>> It
>>>>>doesn't really make sense to classify a discrete rendering
>>>>>
>>>>> So I would say, we still need a render type "discrete raster" which
>>>>> offers
>>>>> the function to "retrieve all unique values" (and automatically apply a
>>>>> discrete color ramp)
>>>>>
>>>>> Attached a (fake) test dataset.
>>>>>
>>>>> Thanks and cheers
>>>>>
>>>>> Stéphane
>>>>>
>>>>>
>>>>> Le lundi 9 janvier 2017, Enrico Fiore  a écrit
>>>>> :
>>>>>
>>>>> > Hi,
>>>>> > Sorry I can't do test, but if you use exact in color interpolation
>>>>> > parameter?
>>>>> >
>>>>> > Cheers
>>>>> >
>>>>> > Enrico
>>>>>
>>>>>
>>>>> Le lundi 9 janvier 2017, Stéphane Henriod  a écrit :
>>>>>
>>>>> > Hi
>>>>> >
>>>>> > unfortunately this is doing quite something different!
>>>>> >
>>>>> > If I have a raster with 10 Landcover classes (1,2,3,4,5,6,7,8,9,10)
>>>>> and I
>>>>> > want to display only 1,5 and 10, using *Discrete *(1: red, 5:
>>>>> yellow, 10:
>>>>> > blue) the following will happen:
>>>>> >
>>>>> > All pixels between 1 and 4 will be red
>>>>> > All pixels between 5 and 9 will be yellow
>>>>> > All pixels with 10 will be blue
>>>>> >
>>>>> > In this sense, the pixels are indeed not interpolated, but this
>>>>> still is
>>>>> > not the behavior I am expecting when styling discrete rasters.
>>>>> >
>>>>> > A "style discrete raster&q

Re: [Qgis-user] Symbolizing a discrete or a boolean raster (Stéphane Henriod)

[Pedro Machado Monteiro]

ested
>>>> 15,234,255,191,255,10 <=  CC < 20
>>>> 25,187,230,149,255,20 <=  CC < 30
>>>> 35,140,201,109,255,30 <=  CC < 40
>>>> 45,98,176,74,255,40 <=  CC < 50
>>>> 55,59,153,43,255,50 <= CC < 60
>>>> 65,0,128,0,255,60 <=  CC < 70
>>>> 75,15,92,11,255,70 <=  CC < 80
>>>> 85,17,61,12,255,80 <=  CC < 90
>>>> 95,16,36,12,255,90 <=  CC <= 100
>>>>
>>>> In my example if I don't assign a value it gets ignored by QGIS.  If
>>>> you are wondering how to assign unique colors to say 200 unique
>>>> values...just script it.  I have done this and as long as you have the
>>>> number of unique values you want and to make them unique in the script it
>>>> works.
>>>>
>>>> I hope this helps.  I know it isn't a "button" but to be honest I like
>>>> this better.  If you already knew this...well then maybe it will help
>>>> someone out in the future.
>>>>
>>>> --Chris
>>>>
>>>> On Mon, Jan 9, 2017 at 3:00 PM, 
>>>> wrote:
>>>>
>>>>> Send Qgis-user mailing list submissions to
>>>>> qgis-user@lists.osgeo.org
>>>>>
>>>>> To subscribe or unsubscribe via the World Wide Web, visit
>>>>> <http://lists.osgeo.org/mailman/listinfo/qgis-user>
>>>>> http://lists.osgeo.org/mailman/listinfo/qgis-user
>>>>> or, via email, send a message with subject or body 'help' to
>>>>> qgis-user-requ...@lists.osgeo.org
>>>>>
>>>>> You can reach the person managing the list at
>>>>> qgis-user-ow...@lists.osgeo.org
>>>>>
>>>>> When replying, please edit your Subject line so it is more specific
>>>>> than "Re: Contents of Qgis-user digest..."
>>>>>
>>>>>
>>>>> Today's Topics:
>>>>>
>>>>>1. Re: Symbolizing a discrete or a boolean raster (Stéphane Henriod)
>>>>>
>>>>>
>>>>> --
>>>>>
>>>>> Message: 1
>>>>> Date: Mon, 9 Jan 2017 23:07:36 +0600
>>>>> From: Stéphane Henriod 
>>>>> To: Enrico Fiore 
>>>>> Cc: qgis-user 
>>>>> Subject: Re: [Qgis-user] Symbolizing a discrete or a boolean raster
>>>>> Message-ID:
>>>>> >>>> ail.com>
>>>>> Content-Type: text/plain; charset="utf-8"
>>>>>
>>>>> Hi
>>>>>
>>>>> thanks for following up!
>>>>>
>>>>> It actually does part of the job!
>>>>>
>>>>> Using *Color interpretation: Exact*, I can indeed input the exact
>>>>> values I
>>>>> want to display (1,5 and 10) and all other pixels are hidden.
>>>>>
>>>>> HOWEVER,
>>>>>
>>>>> this still feels like a workaround:
>>>>>
>>>>>- In the case of a discrete raster with many (> 50) unique values,
>>>>> I do
>>>>>not want to input all of them manually
>>>>>- In some cases, I do not know in advance all the unique values of
>>>>> my
>>>>>raster
>>>>>- If I click on *Classify*, QGIS will choose X values (based on the
>>>>>number of classes and the classification method (continuous or equal
>>>>>interval)), which no longer match the "exact" values of my raster.
>>>>> It
>>>>>doesn't really make sense to classify a discrete rendering
>>>>>
>>>>> So I would say, we still need a render type "discrete raster" which
>>>>> offers
>>>>> the function to "retrieve all unique values" (and automatically apply a
>>>>> discrete color ramp)
>>>>>
>>>>> Attached a (fake) test dataset.
>>>>>
>>>>> Thanks and cheers
>>>>>
>>>>> Stéphane
>>>>>
>>>>>
>>>>> Le lundi 9 janvier 2017, Enrico Fiore  a écrit
>>>>> :
>>>>>
>>>>> > Hi,
>>>>> > Sorry I can't do test, but if you use

Re: [Qgis-user] Symbolizing a discrete or a boolean raster (Stéphane Henriod)

[Stéphane Henriod]

ne this and as long as you have the number of unique
>>> values you want and to make them unique in the script it works.
>>>
>>> I hope this helps.  I know it isn't a "button" but to be honest I like
>>> this better.  If you already knew this...well then maybe it will help
>>> someone out in the future.
>>>
>>> --Chris
>>>
>>> On Mon, Jan 9, 2017 at 3:00 PM, >> .org>
>>> wrote:
>>>
>>>> Send Qgis-user mailing list submissions to
>>>> qgis-user@lists.osgeo.org
>>>> 
>>>>
>>>> To subscribe or unsubscribe via the World Wide Web, visit
>>>> <http://lists.osgeo.org/mailman/listinfo/qgis-user>
>>>> http://lists.osgeo.org/mailman/listinfo/qgis-user
>>>> or, via email, send a message with subject or body 'help' to
>>>> qgis-user-request@lists.osgeo
>>>> .org
>>>>
>>>> You can reach the person managing the list at
>>>> qgis-user-ow...@lists.osgeo.or
>>>> g
>>>>
>>>> When replying, please edit your Subject line so it is more specific
>>>> than "Re: Contents of Qgis-user digest..."
>>>>
>>>>
>>>> Today's Topics:
>>>>
>>>>1. Re: Symbolizing a discrete or a boolean raster (Stéphane Henriod)
>>>>
>>>>
>>>> --
>>>>
>>>> Message: 1
>>>> Date: Mon, 9 Jan 2017 23:07:36 +0600
>>>> From: Stéphane Henriod >>> >
>>>> To: Enrico Fiore >>> >
>>>> Cc: qgis-user >>> >
>>>> Subject: Re: [Qgis-user] Symbolizing a discrete or a boolean raster
>>>> Message-ID:
>>>> >>> ail.com>
>>>> Content-Type: text/plain; charset="utf-8"
>>>>
>>>> Hi
>>>>
>>>> thanks for following up!
>>>>
>>>> It actually does part of the job!
>>>>
>>>> Using *Color interpretation: Exact*, I can indeed input the exact
>>>> values I
>>>> want to display (1,5 and 10) and all other pixels are hidden.
>>>>
>>>> HOWEVER,
>>>>
>>>> this still feels like a workaround:
>>>>
>>>>- In the case of a discrete raster with many (> 50) unique values, I
>>>> do
>>>>not want to input all of them manually
>>>>- In some cases, I do not know in advance all the unique values of my
>>>>raster
>>>>- If I click on *Classify*, QGIS will choose X values (based on the
>>>>number of classes and the classification method (continuous or equal
>>>>interval)), which no longer match the "exact" values of my raster. It
>>>>doesn't really make sense to classify a discrete rendering
>>>>
>>>> So I would say, we still need a render type "discrete raster" which
>>>> offers
>>>> the function to "retrieve all unique values" (and automatically apply a
>>>> discrete color ramp)
>>>>
>>>> Attached a (fake) test dataset.
>>>>
>>>> Thanks and cheers
>>>>
>>>> Stéphane
>>>>
>>>>
>>>> Le lundi 9 janvier 2017, Enrico Fiore >>> > a écrit :
>>>>
>>>> > Hi,
>>>> > Sorry I can't do test, but if you use exact in color interpolation
>>>> > parameter?
>>>> >
>>>> > Cheers
>>>> >
>>>> > Enrico
>>>>
>>>>
>>>> Le lundi 9 janvier 2017, Stéphane Henriod >>> > a écrit :
>>>>
>>>> > Hi
>>>> >
>>>> > unfortunately this is doing quite something different!
>>>> >
>>>> > If I have a raster with 10 Landcover classes (1,2,3,4,5,6,7,8,9,10)
>>>> and I
>>>> > want to display only 1,5 and 10, using *Discrete *(1: red, 5: yellow,
>>>> 10:
>>>> > blue) the following will happen:
>>>> >
>>>> > All pixels between 1 and 4 will be red
>>>> > All pixels between 5 and 9 will be yellow
>>>> > All pixels with 10 will be blue
>>>> >
>>>> > In this sense, the pixels are indeed not interpolated, but thi

Re: [Qgis-user] Symbolizing a discrete or a boolean raster

[Stéphane Henriod]

Hi Kurt

happy to see that I'm not the only one to struggle here!

I linked your request to mine here: http://hub.qgis.org/issues/14845

Are you on the dev list as well? If yes, you can link up to my last
message. The more we are to express this need, the higher the likelihood
that it can get implemented at some point :-)

I don't really work with raster attribute tables but I guess what you
described below could fit in the same implementation. Click on "retrieve
all unique values" can retrieve either from the attribute table or from the
actual  pixel values of a geoTiff.

Cheers

Stéphane


Le mardi 10 janvier 2017, Kurt Menke  a écrit :

> Hi Stéphane,
>
> I too feel this is a major missing piece of functionality in QGIS. I often
> work with large vegetation and landcover rasters, and while it is possible
> to work with them in QGIS, it seems much more laborious than it needs to
> be. I entered a related ticket on this issue last year
>
> https://hub.qgis.org/issues/14449
>
>
>
> My take was slightly different, I was suggesting that there be support for
> raster attribute tables that come with many of these datasets, especially
> when they are in ERDAS Imagine img files. These attribute tables often
> include important data like vegetation type, vegetation complex, etc. If
> the table could be accessed you would then open the dataset up for both
> attribute queries and styling.  These attribute columns could be made
> available to style the raster via the Categorized or Rule based renderers.
> For example, a vegetation dataset could be brought in and styled by the
> vegetation type attribute column. Or groups of vegetation/landcover types
> could be assigned the same color with the Rule based renderer.
>
>
>
> However, your solution may be easier to implement. It would be a major
> improvement to the software…in my humble opinion J
>
> Cheers,
>
>
>
> Kurt
>
>
>
> **
>
> Kurt Menke, GISP
>
> Bird’s Eye View
>
> www.BirdsEyeViewGIS.com 
>
> Work: 505-265-0243
>
> Cell: 505-362-1776
>
>
>


-- 
Stéphane Henriod
CIM-Expert for GIS and Green Economy Statistics

Национальный статистический комитет Кыргызской Республики
Кыргыз Республикасынын Улуттук статистика комитети
National Statistical Committee of the Kyrgyz Republic

374 Фрунзе ул. / Frunze str.
720033 Бишкек / Bishkek

T   +996 778 46 99 02 (KG)
T   +49 176 280 11 050 (DE)
Es...@henriod.info
W   http://www.stat.kg
W3W: nightfall.into.bucket
  //  запас.союз.дружный

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Re: [Qgis-user] Symbolizing a discrete or a boolean raster (Stéphane Henriod)

[Stéphane Henriod]

Hi Harrissou

is there any description / documentation of the work that has been done on
this (feature description, etc.)? If yes, I'd like to have a look and maybe

Thanks a lot!

Stéphane


Le mardi 10 janvier 2017, DelazJ  a écrit :

> Hi Stéphane,
>
> 2017-01-10 4:02 GMT+01:00 Stéphane Henriod  >:
>
>> Hi Chris
>>
>> this is very nice! I indeed didn't know this trick and will certainly use
>> it again in the future!
>>
>> However... :-)
>>
>> I am currently teaching QGIS to beginners and this for sure is not an
>> appropriate method for them (especially in the case you have to generate
>> the symbology file through a script)!
>>
>> Since the user can style continuous rasters with some "button-clicking",
>> I believe the same option should be available for discrete rasters as well.
>>
>> I am thus wondering if anyone else than me sees it as a priority for
>> QGIS? If yes, how to motivate the developers to take it for the next
>> release and / or how much would such a development cost? (I unfortunately
>> don't have the competences to do it myself)
>>
>> There have been some work done in the raster properties dialog in the
> upcoming 3.0. I don't know if your concern was covered though.
> If you want, you can move the question to the developer's list
> <http://qgis.org/en/site/getinvolved/mailinglists.html#qgis-developers-list>
> and discuss whether/how this can be implemented (and its requirements).
>
> Regards,
> Harrissou
>
> Thanks again and cheers!
>>
>> Stéphane
>>
>>
>> Le mardi 10 janvier 2017, Chris House > > a écrit :
>>
>>> Hi Stéphane,
>>>
>>> I don't know if this is what you are looking for or not but I have a
>>> method of classifying rasters by color based on a set (standard) colors.  I
>>> created a spreadsheet that has several required columns, value, red, green,
>>> blue...and you can have an optional field for a display value.  So say
>>> value 1 is water you can use that last column to name that value so that in
>>> the QGIS layer tree and in legend it says Water instead of value 1.
>>>
>>> save the spreadsheet as a csv and change the extension to .txt instead
>>> of .csv.
>>>
>>> I then go into the symbology section of the raster choose singleband
>>> pseudocolor. Use the folder to browse to your text file and click add.
>>> There is a format for this text file.  It is below.  If you need me to
>>> email it I will do that in direct email.
>>>
>>> # QGIS Generated Color Map Export File
>>> INTERPOLATION:EXACT
>>> -,0,0,0,255,NoData
>>> 0,176,176,176,255,Non-Forested
>>> 15,234,255,191,255,10 <=  CC < 20
>>> 25,187,230,149,255,20 <=  CC < 30
>>> 35,140,201,109,255,30 <=  CC < 40
>>> 45,98,176,74,255,40 <=  CC < 50
>>> 55,59,153,43,255,50 <= CC < 60
>>> 65,0,128,0,255,60 <=  CC < 70
>>> 75,15,92,11,255,70 <=  CC < 80
>>> 85,17,61,12,255,80 <=  CC < 90
>>> 95,16,36,12,255,90 <=  CC <= 100
>>>
>>> In my example if I don't assign a value it gets ignored by QGIS.  If you
>>> are wondering how to assign unique colors to say 200 unique values...just
>>> script it.  I have done this and as long as you have the number of unique
>>> values you want and to make them unique in the script it works.
>>>
>>> I hope this helps.  I know it isn't a "button" but to be honest I like
>>> this better.  If you already knew this...well then maybe it will help
>>> someone out in the future.
>>>
>>> --Chris
>>>
>>> On Mon, Jan 9, 2017 at 3:00 PM, 
>>> wrote:
>>>
>>>> Send Qgis-user mailing list submissions to
>>>> qgis-user@lists.osgeo.org
>>>>
>>>> To subscribe or unsubscribe via the World Wide Web, visit
>>>>     http://lists.osgeo.org/mailman/listinfo/qgis-user
>>>> or, via email, send a message with subject or body 'help' to
>>>> qgis-user-requ...@lists.osgeo.org
>>>>
>>>> You can reach the person managing the list at
>>>> qgis-user-ow...@lists.osgeo.org
>>>>
>>>> When replying, please edit your Subject line so it is more specific
>>>> than "Re: Contents of Qgis-user digest..."
>>>>
>>>>
>>>> Today's Topics:
>>>>
>>>>  

Re: [Qgis-user] Symbolizing a discrete or a boolean raster (Stéphane Henriod)

[Richard McDonnell]

Harrissou,

Not sure if this is a solution, or if anyone has already given you this 
answer, but if you know a classified raster has *50* values, which 
you wish to style individually, you could try setting*:

*

 * *Colour Interpolation* to *Linear*
 * *Mode *to*Equal Interval*
 * *Classes *to*51 *(one more than the Max)

I have only just tested this on a raster with 4 values and its worked 
for me!

Hope this helps!

Regards,

Richard.

On 10/01/2017 09:49, DelazJ wrote:

Hi Stéphane,

2017-01-10 4:02 GMT+01:00 Stéphane Henriod <mailto:s...@henriod.info>>:


Hi Chris

this is very nice! I indeed didn't know this trick and will
certainly use it again in the future!

However... :-)

I am currently teaching QGIS to beginners and this for sure is not
an appropriate method for them (especially in the case you have to
generate the symbology file through a script)!

Since the user can style continuous rasters with some
"button-clicking", I believe the same option should be available
for discrete rasters as well.

I am thus wondering if anyone else than me sees it as a priority
for QGIS? If yes, how to motivate the developers to take it for
the next release and / or how much would such a development cost?
(I unfortunately don't have the competences to do it myself)

There have been some work done in the raster properties dialog in the 
upcoming 3.0. I don't know if your concern was covered though.
If you want, you can move the question to the developer's list 
<http://qgis.org/en/site/getinvolved/mailinglists.html#qgis-developers-list> 
and discuss whether/how this can be implemented (and its requirements).


Regards,
Harrissou

Thanks again and cheers!

Stéphane


Le mardi 10 janvier 2017, Chris House mailto:house...@gmail.com>> a écrit :

Hi Stéphane,

I don't know if this is what you are looking for or not but I
have a method of classifying rasters by color based on a set
(standard) colors.  I created a spreadsheet that has several
required columns, value, red, green, blue...and you can have
an optional field for a display value.  So say value 1 is
water you can use that last column to name that value so that
in the QGIS layer tree and in legend it says Water instead of
value 1.

save the spreadsheet as a csv and change the extension to .txt
instead of .csv.

I then go into the symbology section of the raster choose
singleband pseudocolor. Use the folder to browse to your text
file and click add.  There is a format for this text file.  It
is below.  If you need me to email it I will do that in direct
email.

# QGIS Generated Color Map Export File
INTERPOLATION:EXACT
-,0,0,0,255,NoData
0,176,176,176,255,Non-Forested
15,234,255,191,255,10 <=  CC < 20
25,187,230,149,255,20 <=  CC < 30
35,140,201,109,255,30 <=  CC < 40
45,98,176,74,255,40 <=  CC < 50
55,59,153,43,255,50 <= CC < 60
65,0,128,0,255,60 <=  CC < 70
75,15,92,11,255,70 <=  CC < 80
85,17,61,12,255,80 <=  CC < 90
95,16,36,12,255,90 <=  CC <= 100

In my example if I don't assign a value it gets ignored by
QGIS.  If you are wondering how to assign unique colors to say
200 unique values...just script it.  I have done this and as
long as you have the number of unique values you want and to
make them unique in the script it works.

I hope this helps.  I know it isn't a "button" but to be
honest I like this better.  If you already knew this...well
then maybe it will help someone out in the future.

--Chris

On Mon, Jan 9, 2017 at 3:00 PM,
 wrote:

Send Qgis-user mailing list submissions to
qgis-user@lists.osgeo.org

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qgis-user-requ...@lists.osgeo.org

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specific
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Today's Topics:

   1. Re: Symbolizing a discrete or a boolean raster
(Stéphane Henriod)



--

Message: 1
    Date: Mon, 9 Jan 2017 23:07:36 +0600
    From: Stéph

Re: [Qgis-user] Symbolizing a discrete or a boolean raster

[Kurt Menke]

Hi Stéphane,

I too feel this is a major missing piece of functionality in QGIS. I often
work with large vegetation and landcover rasters, and while it is possible
to work with them in QGIS, it seems much more laborious than it needs to be.
I entered a related ticket on this issue last year

https://hub.qgis.org/issues/14449

 

My take was slightly different, I was suggesting that there be support for
raster attribute tables that come with many of these datasets, especially
when they are in ERDAS Imagine img files. These attribute tables often
include important data like vegetation type, vegetation complex, etc. If the
table could be accessed you would then open the dataset up for both
attribute queries and styling.  These attribute columns could be made
available to style the raster via the Categorized or Rule based renderers.
For example, a vegetation dataset could be brought in and styled by the
vegetation type attribute column. Or groups of vegetation/landcover types
could be assigned the same color with the Rule based renderer.

 

However, your solution may be easier to implement. It would be a major
improvement to the software…in my humble opinion :)

Cheers,

 

Kurt

 

**

Kurt Menke, GISP

Bird’s Eye View 

  www.BirdsEyeViewGIS.com 

Work: 505-265-0243

Cell: 505-362-1776

 

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Re: [Qgis-user] Symbolizing a discrete or a boolean raster (Stéphane Henriod)

[Stéphane Henriod]

Done, I moved it to the developer list:
https://lists.osgeo.org/pipermail/qgis-developer/2017-January/046547.html

Thanks for the hint!

Cheers

Stéphane

Le mardi 10 janvier 2017, DelazJ  a écrit :

> Hi Stéphane,
>
> 2017-01-10 4:02 GMT+01:00 Stéphane Henriod  >:
>
>> Hi Chris
>>
>> this is very nice! I indeed didn't know this trick and will certainly use
>> it again in the future!
>>
>> However... :-)
>>
>> I am currently teaching QGIS to beginners and this for sure is not an
>> appropriate method for them (especially in the case you have to generate
>> the symbology file through a script)!
>>
>> Since the user can style continuous rasters with some "button-clicking",
>> I believe the same option should be available for discrete rasters as well.
>>
>> I am thus wondering if anyone else than me sees it as a priority for
>> QGIS? If yes, how to motivate the developers to take it for the next
>> release and / or how much would such a development cost? (I unfortunately
>> don't have the competences to do it myself)
>>
>> There have been some work done in the raster properties dialog in the
> upcoming 3.0. I don't know if your concern was covered though.
> If you want, you can move the question to the developer's list
> <http://qgis.org/en/site/getinvolved/mailinglists.html#qgis-developers-list>
> and discuss whether/how this can be implemented (and its requirements).
>
> Regards,
> Harrissou
>
> Thanks again and cheers!
>>
>> Stéphane
>>
>>
>> Le mardi 10 janvier 2017, Chris House > > a écrit :
>>
>>> Hi Stéphane,
>>>
>>> I don't know if this is what you are looking for or not but I have a
>>> method of classifying rasters by color based on a set (standard) colors.  I
>>> created a spreadsheet that has several required columns, value, red, green,
>>> blue...and you can have an optional field for a display value.  So say
>>> value 1 is water you can use that last column to name that value so that in
>>> the QGIS layer tree and in legend it says Water instead of value 1.
>>>
>>> save the spreadsheet as a csv and change the extension to .txt instead
>>> of .csv.
>>>
>>> I then go into the symbology section of the raster choose singleband
>>> pseudocolor. Use the folder to browse to your text file and click add.
>>> There is a format for this text file.  It is below.  If you need me to
>>> email it I will do that in direct email.
>>>
>>> # QGIS Generated Color Map Export File
>>> INTERPOLATION:EXACT
>>> -,0,0,0,255,NoData
>>> 0,176,176,176,255,Non-Forested
>>> 15,234,255,191,255,10 <=  CC < 20
>>> 25,187,230,149,255,20 <=  CC < 30
>>> 35,140,201,109,255,30 <=  CC < 40
>>> 45,98,176,74,255,40 <=  CC < 50
>>> 55,59,153,43,255,50 <= CC < 60
>>> 65,0,128,0,255,60 <=  CC < 70
>>> 75,15,92,11,255,70 <=  CC < 80
>>> 85,17,61,12,255,80 <=  CC < 90
>>> 95,16,36,12,255,90 <=  CC <= 100
>>>
>>> In my example if I don't assign a value it gets ignored by QGIS.  If you
>>> are wondering how to assign unique colors to say 200 unique values...just
>>> script it.  I have done this and as long as you have the number of unique
>>> values you want and to make them unique in the script it works.
>>>
>>> I hope this helps.  I know it isn't a "button" but to be honest I like
>>> this better.  If you already knew this...well then maybe it will help
>>> someone out in the future.
>>>
>>> --Chris
>>>
>>> On Mon, Jan 9, 2017 at 3:00 PM, 
>>> wrote:
>>>
>>>> Send Qgis-user mailing list submissions to
>>>> qgis-user@lists.osgeo.org
>>>>
>>>> To subscribe or unsubscribe via the World Wide Web, visit
>>>>         http://lists.osgeo.org/mailman/listinfo/qgis-user
>>>> or, via email, send a message with subject or body 'help' to
>>>> qgis-user-requ...@lists.osgeo.org
>>>>
>>>> You can reach the person managing the list at
>>>> qgis-user-ow...@lists.osgeo.org
>>>>
>>>> When replying, please edit your Subject line so it is more specific
>>>> than "Re: Contents of Qgis-user digest..."
>>>>
>>>>
>>>> Today's Topics:
>>>>
>>>>1. Re: Symbolizing a discrete or a boolean r

Re: [Qgis-user] Symbolizing a discrete or a boolean raster (Stéphane Henriod)

[DelazJ]

Hi Stéphane,

2017-01-10 4:02 GMT+01:00 Stéphane Henriod :

> Hi Chris
>
> this is very nice! I indeed didn't know this trick and will certainly use
> it again in the future!
>
> However... :-)
>
> I am currently teaching QGIS to beginners and this for sure is not an
> appropriate method for them (especially in the case you have to generate
> the symbology file through a script)!
>
> Since the user can style continuous rasters with some "button-clicking", I
> believe the same option should be available for discrete rasters as well.
>
> I am thus wondering if anyone else than me sees it as a priority for QGIS?
> If yes, how to motivate the developers to take it for the next release and
> / or how much would such a development cost? (I unfortunately don't have
> the competences to do it myself)
>
> There have been some work done in the raster properties dialog in the
upcoming 3.0. I don't know if your concern was covered though.
If you want, you can move the question to the developer's list
<http://qgis.org/en/site/getinvolved/mailinglists.html#qgis-developers-list>
and discuss whether/how this can be implemented (and its requirements).

Regards,
Harrissou

Thanks again and cheers!
>
> Stéphane
>
>
> Le mardi 10 janvier 2017, Chris House  a écrit :
>
>> Hi Stéphane,
>>
>> I don't know if this is what you are looking for or not but I have a
>> method of classifying rasters by color based on a set (standard) colors.  I
>> created a spreadsheet that has several required columns, value, red, green,
>> blue...and you can have an optional field for a display value.  So say
>> value 1 is water you can use that last column to name that value so that in
>> the QGIS layer tree and in legend it says Water instead of value 1.
>>
>> save the spreadsheet as a csv and change the extension to .txt instead of
>> .csv.
>>
>> I then go into the symbology section of the raster choose singleband
>> pseudocolor. Use the folder to browse to your text file and click add.
>> There is a format for this text file.  It is below.  If you need me to
>> email it I will do that in direct email.
>>
>> # QGIS Generated Color Map Export File
>> INTERPOLATION:EXACT
>> -,0,0,0,255,NoData
>> 0,176,176,176,255,Non-Forested
>> 15,234,255,191,255,10 <=  CC < 20
>> 25,187,230,149,255,20 <=  CC < 30
>> 35,140,201,109,255,30 <=  CC < 40
>> 45,98,176,74,255,40 <=  CC < 50
>> 55,59,153,43,255,50 <= CC < 60
>> 65,0,128,0,255,60 <=  CC < 70
>> 75,15,92,11,255,70 <=  CC < 80
>> 85,17,61,12,255,80 <=  CC < 90
>> 95,16,36,12,255,90 <=  CC <= 100
>>
>> In my example if I don't assign a value it gets ignored by QGIS.  If you
>> are wondering how to assign unique colors to say 200 unique values...just
>> script it.  I have done this and as long as you have the number of unique
>> values you want and to make them unique in the script it works.
>>
>> I hope this helps.  I know it isn't a "button" but to be honest I like
>> this better.  If you already knew this...well then maybe it will help
>> someone out in the future.
>>
>> --Chris
>>
>> On Mon, Jan 9, 2017 at 3:00 PM, 
>> wrote:
>>
>>> Send Qgis-user mailing list submissions to
>>> qgis-user@lists.osgeo.org
>>>
>>> To subscribe or unsubscribe via the World Wide Web, visit
>>> http://lists.osgeo.org/mailman/listinfo/qgis-user
>>> or, via email, send a message with subject or body 'help' to
>>> qgis-user-requ...@lists.osgeo.org
>>>
>>> You can reach the person managing the list at
>>> qgis-user-ow...@lists.osgeo.org
>>>
>>> When replying, please edit your Subject line so it is more specific
>>> than "Re: Contents of Qgis-user digest..."
>>>
>>>
>>> Today's Topics:
>>>
>>>1. Re: Symbolizing a discrete or a boolean raster (Stéphane Henriod)
>>>
>>>
>>> --
>>>
>>> Message: 1
>>> Date: Mon, 9 Jan 2017 23:07:36 +0600
>>> From: Stéphane Henriod 
>>> To: Enrico Fiore 
>>> Cc: qgis-user 
>>> Subject: Re: [Qgis-user] Symbolizing a discrete or a boolean raster
>>> Message-ID:
>>> >> ail.com>
>>> Content-Type: text/plain; charset="utf-8"
>>>
>>> Hi
>>>
>>> thanks for following up!
>>>
>>

Re: [Qgis-user] Symbolizing a discrete or a boolean raster (Stéphane Henriod)

[Stéphane Henriod]

Hi Chris

this is very nice! I indeed didn't know this trick and will certainly use
it again in the future!

However... :-)

I am currently teaching QGIS to beginners and this for sure is not an
appropriate method for them (especially in the case you have to generate
the symbology file through a script)!

Since the user can style continuous rasters with some "button-clicking", I
believe the same option should be available for discrete rasters as well.

I am thus wondering if anyone else than me sees it as a priority for QGIS?
If yes, how to motivate the developers to take it for the next release and
/ or how much would such a development cost? (I unfortunately don't have
the competences to do it myself)

Thanks again and cheers!

Stéphane


Le mardi 10 janvier 2017, Chris House  a écrit :

> Hi Stéphane,
>
> I don't know if this is what you are looking for or not but I have a
> method of classifying rasters by color based on a set (standard) colors.  I
> created a spreadsheet that has several required columns, value, red, green,
> blue...and you can have an optional field for a display value.  So say
> value 1 is water you can use that last column to name that value so that in
> the QGIS layer tree and in legend it says Water instead of value 1.
>
> save the spreadsheet as a csv and change the extension to .txt instead of
> .csv.
>
> I then go into the symbology section of the raster choose singleband
> pseudocolor. Use the folder to browse to your text file and click add.
> There is a format for this text file.  It is below.  If you need me to
> email it I will do that in direct email.
>
> # QGIS Generated Color Map Export File
> INTERPOLATION:EXACT
> -,0,0,0,255,NoData
> 0,176,176,176,255,Non-Forested
> 15,234,255,191,255,10 <=  CC < 20
> 25,187,230,149,255,20 <=  CC < 30
> 35,140,201,109,255,30 <=  CC < 40
> 45,98,176,74,255,40 <=  CC < 50
> 55,59,153,43,255,50 <= CC < 60
> 65,0,128,0,255,60 <=  CC < 70
> 75,15,92,11,255,70 <=  CC < 80
> 85,17,61,12,255,80 <=  CC < 90
> 95,16,36,12,255,90 <=  CC <= 100
>
> In my example if I don't assign a value it gets ignored by QGIS.  If you
> are wondering how to assign unique colors to say 200 unique values...just
> script it.  I have done this and as long as you have the number of unique
> values you want and to make them unique in the script it works.
>
> I hope this helps.  I know it isn't a "button" but to be honest I like
> this better.  If you already knew this...well then maybe it will help
> someone out in the future.
>
> --Chris
>
> On Mon, Jan 9, 2017 at 3:00 PM,  >
> wrote:
>
>> Send Qgis-user mailing list submissions to
>> qgis-user@lists.osgeo.org
>> 
>>
>> To subscribe or unsubscribe via the World Wide Web, visit
>> http://lists.osgeo.org/mailman/listinfo/qgis-user
>> or, via email, send a message with subject or body 'help' to
>> qgis-user-requ...@lists.osgeo.org
>> 
>>
>> You can reach the person managing the list at
>> qgis-user-ow...@lists.osgeo.org
>> 
>>
>> When replying, please edit your Subject line so it is more specific
>> than "Re: Contents of Qgis-user digest..."
>>
>>
>> Today's Topics:
>>
>>1. Re: Symbolizing a discrete or a boolean raster (Stéphane Henriod)
>>
>>
>> --
>>
>> Message: 1
>> Date: Mon, 9 Jan 2017 23:07:36 +0600
>> From: Stéphane Henriod > >
>> To: Enrico Fiore > >
>> Cc: qgis-user > >
>> Subject: Re: [Qgis-user] Symbolizing a discrete or a boolean raster
>> Message-ID:
>> > ail.com
>> 
>> >
>> Content-Type: text/plain; charset="utf-8"
>>
>> Hi
>>
>> thanks for following up!
>>
>> It actually does part of the job!
>>
>> Using *Color interpretation: Exact*, I can indeed input the exact values I
>> want to display (1,5 and 10) and all other pixels are hidden.
>>
>> HOWEVER,
>>
>> this still feels like a workaround:
>>
>>- In the case of a discrete raster with many (> 50) unique values, I do
>>not want to input all of them manually
>>- In some cases, I do not know in advance all the unique values of my
>>raster
>>- If I click on *Classify*, QGIS will choose X values (based on the
>>number of classes and the classification method (continuous or equal
>>interval)), which no longer match the "exact" values of my raster. It
>>doesn't r

Re: [Qgis-user] Symbolizing a discrete or a boolean raster (Stéphane Henriod)

[Chris House]

Hi Stéphane,

I don't know if this is what you are looking for or not but I have a method
of classifying rasters by color based on a set (standard) colors.  I
created a spreadsheet that has several required columns, value, red, green,
blue...and you can have an optional field for a display value.  So say
value 1 is water you can use that last column to name that value so that in
the QGIS layer tree and in legend it says Water instead of value 1.

save the spreadsheet as a csv and change the extension to .txt instead of
.csv.

I then go into the symbology section of the raster choose singleband
pseudocolor. Use the folder to browse to your text file and click add.
There is a format for this text file.  It is below.  If you need me to
email it I will do that in direct email.

# QGIS Generated Color Map Export File
INTERPOLATION:EXACT
-,0,0,0,255,NoData
0,176,176,176,255,Non-Forested
15,234,255,191,255,10 <=  CC < 20
25,187,230,149,255,20 <=  CC < 30
35,140,201,109,255,30 <=  CC < 40
45,98,176,74,255,40 <=  CC < 50
55,59,153,43,255,50 <= CC < 60
65,0,128,0,255,60 <=  CC < 70
75,15,92,11,255,70 <=  CC < 80
85,17,61,12,255,80 <=  CC < 90
95,16,36,12,255,90 <=  CC <= 100

In my example if I don't assign a value it gets ignored by QGIS.  If you
are wondering how to assign unique colors to say 200 unique values...just
script it.  I have done this and as long as you have the number of unique
values you want and to make them unique in the script it works.

I hope this helps.  I know it isn't a "button" but to be honest I like this
better.  If you already knew this...well then maybe it will help someone
out in the future.

--Chris

On Mon, Jan 9, 2017 at 3:00 PM,  wrote:

> Send Qgis-user mailing list submissions to
> qgis-user@lists.osgeo.org
>
> To subscribe or unsubscribe via the World Wide Web, visit
> http://lists.osgeo.org/mailman/listinfo/qgis-user
> or, via email, send a message with subject or body 'help' to
> qgis-user-requ...@lists.osgeo.org
>
> You can reach the person managing the list at
> qgis-user-ow...@lists.osgeo.org
>
> When replying, please edit your Subject line so it is more specific
> than "Re: Contents of Qgis-user digest..."
>
>
> Today's Topics:
>
>1. Re: Symbolizing a discrete or a boolean raster (Stéphane Henriod)
>
>
> ----------
>
> Message: 1
> Date: Mon, 9 Jan 2017 23:07:36 +0600
> From: Stéphane Henriod 
> To: Enrico Fiore 
> Cc: qgis-user 
> Subject: Re: [Qgis-user] Symbolizing a discrete or a boolean raster
> Message-ID:
>  gmail.com>
> Content-Type: text/plain; charset="utf-8"
>
> Hi
>
> thanks for following up!
>
> It actually does part of the job!
>
> Using *Color interpretation: Exact*, I can indeed input the exact values I
> want to display (1,5 and 10) and all other pixels are hidden.
>
> HOWEVER,
>
> this still feels like a workaround:
>
>- In the case of a discrete raster with many (> 50) unique values, I do
>not want to input all of them manually
>- In some cases, I do not know in advance all the unique values of my
>raster
>- If I click on *Classify*, QGIS will choose X values (based on the
>number of classes and the classification method (continuous or equal
>interval)), which no longer match the "exact" values of my raster. It
>doesn't really make sense to classify a discrete rendering
>
> So I would say, we still need a render type "discrete raster" which offers
> the function to "retrieve all unique values" (and automatically apply a
> discrete color ramp)
>
> Attached a (fake) test dataset.
>
> Thanks and cheers
>
> Stéphane
>
>
> Le lundi 9 janvier 2017, Enrico Fiore  a écrit :
>
> > Hi,
> > Sorry I can't do test, but if you use exact in color interpolation
> > parameter?
> >
> > Cheers
> >
> > Enrico
>
>
> Le lundi 9 janvier 2017, Stéphane Henriod  a écrit :
>
> > Hi
> >
> > unfortunately this is doing quite something different!
> >
> > If I have a raster with 10 Landcover classes (1,2,3,4,5,6,7,8,9,10) and I
> > want to display only 1,5 and 10, using *Discrete *(1: red, 5: yellow, 10:
> > blue) the following will happen:
> >
> > All pixels between 1 and 4 will be red
> > All pixels between 5 and 9 will be yellow
> > All pixels with 10 will be blue
> >
> > In this sense, the pixels are indeed not interpolated, but this still is
> > not the behavior I am expecting when styling discrete rasters.
> >
> > A "style di

Re: [Qgis-user] Symbolizing a discrete or a boolean raster

[Stéphane Henriod]

Hi

unfortunately this is doing quite something different!

If I have a raster with 10 Landcover classes (1,2,3,4,5,6,7,8,9,10) and I
want to display only 1,5 and 10, using *Discrete *(1: red, 5: yellow, 10:
blue) the following will happen:

All pixels between 1 and 4 will be red
All pixels between 5 and 9 will be yellow
All pixels with 10 will be blue

In this sense, the pixels are indeed not interpolated, but this still is
not the behavior I am expecting when styling discrete rasters.

A "style discrete raster" function should offer the following:

   - Automatically recover all unique values from the raster
   - Only display the pixels to which the user has explicitly assigned a
   color

But thanks for your hint, this can be helpful in other cases!

Cheers

Stéphane


Le lundi 9 janvier 2017, Enrico Fiore  a écrit :

> Hi,
> I think that the solution is in the QGIS documentation, that you can read
> here: http://docs.qgis.org/2.14/en/docs/user_manual/working_with_
> raster/raster_properties.html#band-rendering
> you have to use *Singleband pseudocolor *and set color interpolation to
> Discrete.
>
> Enrico
>
>
> Messaggio originale
> Da: "Stéphane Henriod"  >
> Data: 09/01/2017 6.30
> A: "qgis-user" >
> Ogg: [Qgis-user] Symbolizing a discrete or a boolean raster
>
> Dear all
>
> As much as I love QGIS and use it in my everyday life, there is one
> feature that I find particularly annoying: the styling of discrete rasters.
>
> Basically, if I have a raster layer consisting of discrete landcover
> values (1: water, 2: forest, 3: built-up), it seems that there is no easy
> way to style it. QGIS will assume that the data is continuous and basically
> interpolate the color between each value, which leads to the following
> issues:
>
> Let's say I want to display only water and built-up (values 1 and 3),
> water in blue and built-up in grey. QGIS will still display the forests,
> using a color somewhere "between" blue and grey. My only left option is to
> process the raster to actually replace all the 2 with NoData, which is
> highly unpractical...
>
> Same if I have a boolean raster (only 0 and 1 values). QGIS will by
> default make a color ramp from 0 to 0..
>
> Also, the whole rather feels like a work-around for a missing feature.
>
> I dream of a feature similar to this one from ArcGIS: http://resources.
> arcgis.com/en/help/main/10.1/index.html#/representing_
> unique_categories_such_as_land_use/009t007400/ where all unique
> values are styled independently and where I can easily skip the values I
> don't want to see on my map.
>
> I asked a question here:
> http://gis.stackexchange.com/questions/194116/qgis-style-a-discrete-raster
>
> and opened a ticket here:
> http://hub.qgis.org/issues/14845
>
> But none has gotten lots of attention yet... Am I the only one to be
> annoyed by this? If no, please raise your hand and let's try to get some
> momentum and see how to push this feature forward!
>
> Thanks a lot in advance!
>
> Cheers
>
> Stéphane
>
>
> --
> Stéphane Henriod
> CIM-Expert for GIS and Green Economy Statistics
>
> Национальный статистический комитет Кыргызской Республики
> Кыргыз Республикасынын Улуттук статистика комитети
> National Statistical Committee of the Kyrgyz Republic
>
> 374 Фрунзе ул. / Frunze str.
> 720033 Бишкек / Bishkek
>
> T   +996 778 46 99 02 (KG)
> T   +49 176 280 11 050 (DE)
> Es...@henriod.info 
> W   http://www.stat.kg
> W3W: nightfall.into.bucket
> <https://map.what3words.com/nightfall.into.bucket>  //  запас.союз.дружный
> <https://map.what3words.com/запас.союз.дружный>
>
>
>
>

-- 
Stéphane Henriod
CIM-Expert for GIS and Green Economy Statistics

Национальный статистический комитет Кыргызской Республики
Кыргыз Республикасынын Улуттук статистика комитети
National Statistical Committee of the Kyrgyz Republic

374 Фрунзе ул. / Frunze str.
720033 Бишкек / Bishkek

T   +996 778 46 99 02 (KG)
T   +49 176 280 11 050 (DE)
Es...@henriod.info
W   http://www.stat.kg
W3W: nightfall.into.bucket
<https://map.what3words.com/nightfall.into.bucket>  //  запас.союз.дружный
<https://map.what3words.com/запас.союз.дружный>
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[Qgis-user] Symbolizing a discrete or a boolean raster

[Stéphane Henriod]

Dear all

As much as I love QGIS and use it in my everyday life, there is one feature
that I find particularly annoying: the styling of discrete rasters.

Basically, if I have a raster layer consisting of discrete landcover values
(1: water, 2: forest, 3: built-up), it seems that there is no easy way to
style it. QGIS will assume that the data is continuous and basically
interpolate the color between each value, which leads to the following
issues:

Let's say I want to display only water and built-up (values 1 and 3), water
in blue and built-up in grey. QGIS will still display the forests, using a
color somewhere "between" blue and grey. My only left option is to process
the raster to actually replace all the 2 with NoData, which is highly
unpractical...

Same if I have a boolean raster (only 0 and 1 values). QGIS will by default
make a color ramp from 0 to 0..

Also, the whole rather feels like a work-around for a missing feature.

I dream of a feature similar to this one from ArcGIS:
http://resources.arcgis.com/en/help/main/10.1/index.html#/representing_unique_categories_such_as_land_use/009t007400/
where all unique values are styled independently and where I can easily
skip the values I don't want to see on my map.

I asked a question here:
http://gis.stackexchange.com/questions/194116/qgis-style-a-discrete-raster

and opened a ticket here:
http://hub.qgis.org/issues/14845

But none has gotten lots of attention yet... Am I the only one to be
annoyed by this? If no, please raise your hand and let's try to get some
momentum and see how to push this feature forward!

Thanks a lot in advance!

Cheers

Stéphane


-- 
Stéphane Henriod
CIM-Expert for GIS and Green Economy Statistics

Национальный статистический комитет Кыргызской Республики
Кыргыз Республикасынын Улуттук статистика комитети
National Statistical Committee of the Kyrgyz Republic

374 Фрунзе ул. / Frunze str.
720033 Бишкек / Bishkek

T   +996 778 46 99 02 (KG)
T   +49 176 280 11 050 (DE)
Es...@henriod.info
W   http://www.stat.kg
W3W: nightfall.into.bucket
  //  запас.союз.дружный

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