Re: [Qgis-user] representation of angles in QGIS - recalculation to arithmetic values

[geo . guide]

 

Dear Richard,

 

thanks a lot for the formula !

It works fine in Excel and in QGIS. For others in QGIS the int() _expression_ has to be replaced by floor()

 

Warm regards, Christine

 
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Re: [Qgis-user] basic contouring and kriging

[Nicolas Cadieux]

Hi,

Open the Processing toolbox panel, search for 'Krigging'.  You will see 
multiple SAGA modules. If you search for "interpolation", you will find 
IDW AND TIN under Q modules and other methods under the SAGA module. If 
you search for "grid" you will find multiple algorithms under 
GDAL/Raster analysis.  See 
https://gdal.org/tutorials/gdal_grid_tut.html#gdal-grid-tut and 
https://gdal.org/programs/gdal_grid.html  for other methods. This should 
cover it.


The idea is generally to interpolate a raster surface from points or 
lines containing a z field or a z value (in 3D files).  After, you use 
Raster/Extract/Contour on this new raster layer.  You can also install 
the contour plugin.  That uses a point file only but I don't know the 
what algorithm it uses.


You may find more algorithm using CrimeStat or GeoDa softwares.

Hope this helps.


Nicolas



On 2021-12-06 1:59 p.m., Firstname Lastname wrote:

hello group:
i want to demonstrate some of the pitfalls of computer contouring 
methods with limited datasets.  i wanted to use a small dataset to 
demonstrate several contouring algorithms. In particular, linear 
interpolation, inverse weighted, nearest neighbour and kriging.  Are 
any of these built into QGIS?  i do not see any options to control the 
contouring in the plugins for any options other than the default.

thank you if you can provide any help.

--
Byron Veilleux, MSc. P.Geo
Conjugate Geologic Services Limited
Calgary, Alberta Canada
by...@conjugategeo.com
Cell:4037108414

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Re: [Qgis-user] basic contouring and kriging

[chris hermansen]

Byron and list,

On Mon, Dec 6, 2021 at 10:59 AM Firstname Lastname 
wrote:

> hello group:
> i want to demonstrate some of the pitfalls of computer contouring methods
> with limited datasets.  i wanted to use a small dataset to demonstrate
> several contouring algorithms.  In particular, linear interpolation,
> inverse weighted, nearest neighbour and kriging.  Are any of these built
> into QGIS?  i do not see any options to control the contouring in the
> plugins for any options other than the default.
> thank you if you can provide any help.
>
>
I believe you want to look at the surface interpolation rather than
contouring; that is, contouring is just something you do with a surface
once it's interpolated.

For example this tutorial
https://www.qgistutorials.com/en/docs/3/interpolating_point_data.html


-- 
Chris Hermansen · clhermansen "at" gmail "dot" com

C'est ma façon de parler.
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[Qgis-user] basic contouring and kriging

[Firstname Lastname]

hello group:
i want to demonstrate some of the pitfalls of computer contouring methods
with limited datasets.  i wanted to use a small dataset to demonstrate
several contouring algorithms.  In particular, linear interpolation,
inverse weighted, nearest neighbour and kriging.  Are any of these built
into QGIS?  i do not see any options to control the contouring in the
plugins for any options other than the default.
thank you if you can provide any help.

-- 
Byron Veilleux, MSc. P.Geo
Conjugate Geologic Services Limited
Calgary, Alberta Canada
by...@conjugategeo.com
Cell:4037108414
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Re: [Qgis-user] representation of angles in QGIS - recalculation to arithmetic values

[Richard Greenwood]

g = (450-m) - int((450-m) / 360) * 360
where m = mathematical angle (0 east, anti-clockwise)
and g = geographic angle (0 north, clockwise)

On Mon, Dec 6, 2021 at 11:02 AM  wrote:

> Dear colleagues on the QGIS user list,
>
> have an urgent problem with the representation of arrows with a data
> defined angle in QGIS.
>
> Up to now the free GIS world lived with angles assuming north being 0,
> east being 90 degrees and so on clockwise until reaching north again (which
> might be 360 degrees as well). At least QGIS and many other GIS programs
> work such a way.
>
> But: Now I have encountered a new version - probably created in the ESRI
> world, perhaps for harassment or to create a distinctive new feature. This
> is called an arithmetic angle, having East for 0 degree, North for 90
> degrees and so on counter-clockwise !
> Actually I it's somehow hard to preserve my humour for this invention.
>
> Is there a simple possibility to recalculate the "normal" northed angles
> to the "arithmetic" easted angles ? It's not that easy, because the
> rotation is counter-clockwise.
>
> Should very urgently prepare some maps with flow arrows in QGIS which
> normally assumes northed (geographical) angles  The values got
> automatically exported from a simulation software with the arithmetic angle
> system, can't change that.  By the way this is meanwhile also demanded by
> south german agency as an output specification.
>
> Has somebody a clue how to solve such a problem in QGIS or how to
> recalculate from one to the other system ? Have about 5000 values, so
> little chance to get this done manually. At least not in time.
>
> Thanks a lot for a soon feed back,
> Christine
>
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Re: [Qgis-user] representation of angles in QGIS - recalculation to arithmetic values

[geo . guide]

Dear user list,

 

sorry, meant to recalculate from the arithmetic values to geographic values in order to allow a proper representation in a QGIS map.

 

Regards, Christine

 
 

Gesendet: Montag, 06. Dezember 2021 um 18:56 Uhr
Von: geo.gu...@web.de
An: qgis-user@lists.osgeo.org
Betreff: [Qgis-user] representation of angles in QGIS - recalculation to arithmetic values



Dear colleagues on the QGIS user list,

 

have an urgent problem with the representation of arrows with a data defined angle in QGIS.

 

Up to now the free GIS world lived with angles assuming north being 0, east being 90 degrees and so on clockwise until reaching north again (which might be 360 degrees as well). At least QGIS and many other GIS programs work such a way.

 

But: Now I have encountered a new version - probably created in the ESRI world, perhaps for harassment or to create a distinctive new feature. This is called an arithmetic angle, having East for 0 degree, North for 90 degrees and so on counter-clockwise !

Actually I it's somehow hard to preserve my humour for this invention.

 

Is there a simple possibility to recalculate the "normal" northed angles to the "arithmetic" easted angles ? It's not that easy, because the rotation is counter-clockwise.

 

Should very urgently prepare some maps with flow arrows in QGIS which normally assumes northed (geographical) angles  The values got automatically exported from a simulation software with the arithmetic angle system, can't change that.  By the way this is meanwhile also demanded by south german agency as an output specification.

 

Has somebody a clue how to solve such a problem in QGIS or how to recalculate from one to the other system ? Have about 5000 values, so little chance to get this done manually. At least not in time.

 

Thanks a lot for a soon feed back,

Christine

 

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[Qgis-user] representation of angles in QGIS - recalculation to arithmetic values

[geo . guide]

Dear colleagues on the QGIS user list,

 

have an urgent problem with the representation of arrows with a data defined angle in QGIS.

 

Up to now the free GIS world lived with angles assuming north being 0, east being 90 degrees and so on clockwise until reaching north again (which might be 360 degrees as well). At least QGIS and many other GIS programs work such a way.

 

But: Now I have encountered a new version - probably created in the ESRI world, perhaps for harassment or to create a distinctive new feature. This is called an arithmetic angle, having East for 0 degree, North for 90 degrees and so on counter-clockwise !

Actually I it's somehow hard to preserve my humour for this invention.

 

Is there a simple possibility to recalculate the "normal" northed angles to the "arithmetic" easted angles ? It's not that easy, because the rotation is counter-clockwise.

 

Should very urgently prepare some maps with flow arrows in QGIS which normally assumes northed (geographical) angles  The values got automatically exported from a simulation software with the arithmetic angle system, can't change that.  By the way this is meanwhile also demanded by south german agency as an output specification.

 

Has somebody a clue how to solve such a problem in QGIS or how to recalculate from one to the other system ? Have about 5000 values, so little chance to get this done manually. At least not in time.

 

Thanks a lot for a soon feed back,

Christine

 
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Re: [Qgis-user] startup.py on network folder

[Wolfgang Meinolf]

Hi Stefan,
thks for the fast response. That’s something, I can build on.
Br
Wolfgang

Von: Stefan Giese (WhereGroup) 
Gesendet: Montag, 6. Dezember 2021 17:35
An: Wolfgang Meinolf ; qgis-user 

Betreff: Re: [Qgis-user] startup.py on network folder


Hi Wolfgang,

you can start QGIS with a command line option --code followed by the path and 
scriptname, for example in a BAT file

Best regards

stefan
Am 06.12.2021 um 17:31 schrieb Wolfgang Meinolf:
Hi,
I like to implement a centrally controlled QGIS environment for our workforce 
using startup.py. Is there any trick, to put startup.py on a network folder 
instead the user’s QGIS folder i.e. under Windows 
%user%\AppData\Roaming\QGIS\QGIS3?

PYQGIS_STARTUP environment variable to change the location does unfortunately 
not work.

Thanks
Wolfgang



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Re: [Qgis-user] startup.py on network folder

[Stefan Giese (WhereGroup)]

Hi Wolfgang,

you can start QGIS with a command line option *--code *followed by the 
path and scriptname, for example in a BAT file


Best regards

stefan
**

Am 06.12.2021 um 17:31 schrieb Wolfgang Meinolf:


Hi,

I like to implement a centrally controlled QGIS environment for our 
workforce using startup.py. Is there any trick, to put startup.py on a 
network folder instead the user’s QGIS folder i.e. under Windows 
%user%\AppData\Roaming\QGIS\QGIS3?


PYQGIS_STARTUP environment variable to change the location does 
unfortunately not work.


Thanks

Wolfgang


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--
Mit freundlichen Grüßen
Stefan Giese
Projektleiter/Consultant
--
Aufwind durch Wissen!
Jetzt neu: Webinare und Online-Schulungen
bei derwww.foss-academy.com
--

WhereGroup GmbH
Schwimmbadstr. 2
79100 Freiburg
Germany

Fon: +49 (0)761 / 519 102 - 61
Fax: +49 (0)761 / 519 102 - 11

stefan.gi...@wheregroup.com
www.wheregroup.com
Geschäftsführer:
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Amtsgericht Bonn, HRB 9885



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[Qgis-user] startup.py on network folder

[Wolfgang Meinolf]

Hi,
I like to implement a centrally controlled QGIS environment for our workforce 
using startup.py. Is there any trick, to put startup.py on a network folder 
instead the user’s QGIS folder i.e. under Windows 
%user%\AppData\Roaming\QGIS\QGIS3?

PYQGIS_STARTUP environment variable to change the location does unfortunately 
not work.

Thanks
Wolfgang


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Re: [Qgis-user] Raster layer opacity expression - how does it work?

[Ujaval Gandhi]

You can also try the “Mask” plugin for more control.
https://plugins.qgis.org/plugins/mask/

On Mon, 6 Dec 2021 at 7:43 PM, DelazJ  wrote:

> Hi,
> And here's the feature in the changelog (
> https://qgis.org/en/site/forusers/visualchangelog322/index.html#feature-data-defined-raster-layer-opacity);
> afaict, it affects the whole layer and not pixel by pixel.
>
> On a kind-of "off topic" request, I'd also be interested to see examples
> of expressions playing with raster functions.
>
> Regards,
> Harrissou
>
> Le lun. 6 déc. 2021 à 13:32, Johannes Kröger (WhereGroup) <
> johannes.kroe...@wheregroup.com> a écrit :
>
>> Anything that you can do with expressions, in this case to get a number
>> between 0 and 100, but it will always affect the whole layer globally.
>> You can not set a different opacity for different regions. For this,
>> approaches like Ujaval's suggestion are probably the best way.
>>
>> Cheers
>> Hannes
>>
>> > I'd still really like to know what can be done using an expression for
>> > the Global Opacity of a raster layer.
>>
>> --
>> Johannes Kröger / GIS-Entwickler/-Berater
>> WhereGroup GmbH
>> Eifelstraße 7
>> 
>> 53119 Bonn
>> 
>> Germany
>> 
>>
>> Tel: +49 (0)228 / 90 90 38 - 36
>> Fax: +49 (0)228 / 90 90 38 - 11
>>
>> johannes.kroe...@wheregroup.com
>> www.wheregroup.com
>> Geschäftsführer:
>> Olaf Knopp, Peter Stamm
>> Amtsgericht Bonn, HRB 9885
>> ---
>>
>> 
>> Where2B Konferenz 2021
>> Online am 16. Dezember 2021
>> https://where2b-conference.com/
>> 
>>
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[image: Logo] 
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Spatial Thoughts
mobile: +91-8095684687
email: uja...@spatialthoughts.com
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Twitter icon] 
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Re: [Qgis-user] Raster layer opacity expression - how does it work?

[DelazJ]

Hi,
And here's the feature in the changelog (
https://qgis.org/en/site/forusers/visualchangelog322/index.html#feature-data-defined-raster-layer-opacity);
afaict, it affects the whole layer and not pixel by pixel.

On a kind-of "off topic" request, I'd also be interested to see examples of
expressions playing with raster functions.

Regards,
Harrissou

Le lun. 6 déc. 2021 à 13:32, Johannes Kröger (WhereGroup) <
johannes.kroe...@wheregroup.com> a écrit :

> Anything that you can do with expressions, in this case to get a number
> between 0 and 100, but it will always affect the whole layer globally.
> You can not set a different opacity for different regions. For this,
> approaches like Ujaval's suggestion are probably the best way.
>
> Cheers
> Hannes
>
> > I'd still really like to know what can be done using an expression for
> > the Global Opacity of a raster layer.
>
> --
> Johannes Kröger / GIS-Entwickler/-Berater
> WhereGroup GmbH
> Eifelstraße 7
> 53119 Bonn
> Germany
>
> Tel: +49 (0)228 / 90 90 38 - 36
> Fax: +49 (0)228 / 90 90 38 - 11
>
> johannes.kroe...@wheregroup.com
> www.wheregroup.com
> Geschäftsführer:
> Olaf Knopp, Peter Stamm
> Amtsgericht Bonn, HRB 9885
> ---
>
> 
> Where2B Konferenz 2021
> Online am 16. Dezember 2021
> https://where2b-conference.com/
> 
>
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Re: [Qgis-user] Bug Qgis 3.22.1

[Nicolas Cadieux]

Hi,

While I am still on 3.20, I suggest you try again. Make sure the layer is 
selected and in editing mode, that you are adding the correct geometry type for 
the layer.  Check the CRS as it’s possible that this could be a simple 
reprojection issue.  Explain the exact steps you used as the image does not 
give us any information. Indicate what OS you have. 

If you continue having problem, I suggest you create a new user profile.  That 
will remove the plugins and restores GUI defaults  It fixes many issues.

If this is a true bug, then I suggest you start with the above steps and then 
write a formal bug report.

Nicolas Cadieux
https://gitlab.com/njacadieux

> Le 6 déc. 2021 à 06:17, i...@otuff.com a écrit :
> 
> 
> Hello,
> 
> After updating to Qgis 3.22.1 (on win10 fr), I think I encountered a bug! 
> I drew a polygon on a new layer, but after saving layer, the polygon is not 
> on any layer !!! as you can see on the jpeg below: 
> 
> 
> 
> What to do to recover a functional .Qgis project? 
> 
> Thank you 
> Olivier
> 
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Re: [Qgis-user] Raster layer opacity expression - how does it work?

[WhereGroup]

Anything that you can do with expressions, in this case to get a number 
between 0 and 100, but it will always affect the whole layer globally. 
You can not set a different opacity for different regions. For this, 
approaches like Ujaval's suggestion are probably the best way.


Cheers
Hannes

I'd still really like to know what can be done using an expression for 
the Global Opacity of a raster layer. 


--
Johannes Kröger / GIS-Entwickler/-Berater
WhereGroup GmbH
Eifelstraße 7
53119 Bonn
Germany

Tel: +49 (0)228 / 90 90 38 - 36
Fax: +49 (0)228 / 90 90 38 - 11

johannes.kroe...@wheregroup.com
www.wheregroup.com
Geschäftsführer:
Olaf Knopp, Peter Stamm
Amtsgericht Bonn, HRB 9885
---


Where2B Konferenz 2021
Online am 16. Dezember 2021
https://where2b-conference.com/




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Re: [Qgis-user] Raster layer opacity expression - how does it work?

[Jonathan Schultz]

Thanks for the quick response.

I tried following your suggestion but it doesn't seem to be quite what I 
want. If I understand correctly, what it does is overlay solid grey at 
50% opacity over the layer that I want to highlight. Any layers under 
that layer therefore also get the 50% grey overlaid on them, which I 
don't want.


I'd still really like to know what can be done using an expression for 
the Global Opacity of a raster layer.


Cheers,
Jonathan

On 6/12/21 00:07, Ujaval Gandhi wrote:
I assume you are trying to set the opacity to 50% outside of a polygon 
layer. This can be done using the 'Inverted Polygon' renderer. See this 
screenshot https://ibb.co/Sf5HySf 


Logo    
Ujaval Gandhi
Spatial Thoughts
mobile: +91-8095684687
email: uja...@spatialthoughts.com 
LinkedIn icon  Twitter 
icon 





On Sun, Dec 5, 2021 at 5:12 PM Jonathan Schultz > wrote:


Hello,

I'm trying to use opacity on a raster layer to highlight an area of
interest. So, for example, I would use opacity 100 for an area (defined
in another layer), and 50 for anywhere outside that area. But I can't
seem to even find basic documentation on how the Renderer opacity
values
work. If I enable the Assistant I get a bunch of fields: Source (an
expression), Values from and to, plus a checkbox "Apply transform
curve"
with its own set of fields.

When I google words like "Renderer opacity" all I get are references to
the source code but no documentation or examples.

This is QGIS version 3.22.0-Białowieża running on Linux/Debian.

Does anyone know how this stuff works, or how I could find out?

Thanks!
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[Qgis-user] Bug Qgis 3.22.1

[i...@otuff.com]

Hello,

After updating to Qgis 3.22.1 (on win10 fr), I think I encountered a bug!
I drew a polygon on a new layer, but after saving layer, the polygon is 
not on any layer !!! as you can see on the jpeg below:


Qgis3.22.1 Bug

What to do to recover a functional .Qgis project?

Thank you
Olivier
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