[Qgis-user] How to force expression labels to be re-evaluated

[Chris Crook]

Hi

I am displaying a delimited text layer and have labels that are based on 
expressions.  However when I  update the source data file the labels are not 
being refresh when I reload the layer, or even if I close and reload the 
project.

Is there a way to force the labels to refresh, or ensure that labels are 
evaluated on the fly?

QGIS version: 2.18.4
Platform: Ubuntu 16.04

Thanks
Chris

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Re: [Qgis-user] Primitive Troubleshooting

[Stephen Wandling]

Arni,

I guess because it seemed the obvious thing to do, I had been placing my 
raster layer first, in all of my projects.  I see now that if I place my 
Roads (or other local shape file) first, then when I place the raster 
layer, I see the correct EPSG of 26910 (OTF) in the lower right corner.  
And, everything aligns: Roads on the raster roads, etc.


Is OTF always on or have I just not yet found where I might toggle it?

When I export from Composer, I get the error message to export as 
raster.  I have now learned that I can un-check Print as Raster in the 
error message and it allows exporting to a PDF in what I presume is 
vector?  Regardless, the PDF that is created is more than adequate for 
printing as a standard paper map.


So, thank you for giving me the clues that allowed this to happen.

I do have a nagging question: In ArcGIS, you have a Data Frame that you 
build your project in.  While I have searched for more info, it seems 
that in QGIS, the Canvass is the area to the right of the Layers panel?  
That does not seem the way it should be.  E.g., if I push the layers to 
as narrow as it goes and arrange my project in the area to the right, if 
I then drag the Layers panel to make it wider, the Canvass would be 
cropped, when I would expect/want it to be compressed.


What am I missing in regards to the size of the Canvass?

Thanks again,
Stephen

On 27/02/2017 10:23 AM, Árni Geirsson wrote:

I'm not sure what went wrong in your process but I would think that the
safest route, to avoid CRS related problems, is to start a project in your
Roads CRS, include the Roads layer, then georeference your scanned map to
that same CRS and ultimately use the same CRS when you save the
georeferenced map. If you need to have the georeferenced map in a different
CRS, then use the Warp tool afterwards.

Arni


Árni Geirsson
*Alta ehf* // +354 582 5000 // +354 897 9549

On 27 February 2017 at 18:09, Stephen Wandling  wrote:

   

Earlier I was trying to figure out why Composer wanted to export raster
files, and I wanted vector.  I finally reduced my 'map' to the raster base
map and one local shape file, Roads.  With this I found that selecting the
layer Roads and using "Set Project CRS to this Layer" was causing Composer
to default to raster output.  A clue!

I had noticed that the raster base map rotated 2 or 3 degrees CW when I
used "Set Project CRS to this Layer", above.  I also noticed that in
Composer, if I had not used "Set Project CRS to this Layer", placing a UTM
grid on my map resulted in the grid being rotated 2 or 3 degrees CCW.  So,
it appears that the grid is based on the base map?

In reading today's posts, I noted mention of Georeferencer.  Digging into
this, the tutorials, etc seemed to require having another input, to compare
points.  I thought I might be able to accomplish this by comparing my Roads
layer with the raster map.

I loaded my local Roads shape file into a new canvass in QGIS and my
raster base map into Georeferencer.  I would click a particular
intersection in georeferencer and it would produce the 'enter coordinates'
or 'get from map' options.  Selecting the latter, it switched to the map
canvass and I could zoom in and click the same intersection.  This would
send me back to the previous menu where the coordinates were filled in and
I would select OK.  I did this on 4 points.  On the fourth point, I noted
the red line angled 2 or 3 degrees CW, but quite long.

I saved the points in a file and Started Georeferencing.  The completed
raster base map came up on the QGIS canvass, along with the Roads shape
file.

What I saw did not please me.  In some places, the Roads were now falling
at least 1/2 kilometer off from the base map road locations.  This put them
in creek ravines and other hillshade elements.  The results were unusable
for my purposes.

When I had used "Set Project CRS to this Layer", the Roads layer fell onto
the roads on the raster map.  Streams fell onto their ravines.

Maybe I have to get another base map?  Or maybe my georeferencing method
was faulty?

Stephen

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[Qgis-user] exporting to dxf problem

[Boaz Bar Ilan]

I'm trying to use the exporting to dxf. it seems to work and it creates  a
file but it cant be viewd  with autocad viewer.

thanks

boaz
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Re: [Qgis-user] Primitive Troubleshooting

[Árni Geirsson]

I'm not sure what went wrong in your process but I would think that the
safest route, to avoid CRS related problems, is to start a project in your
Roads CRS, include the Roads layer, then georeference your scanned map to
that same CRS and ultimately use the same CRS when you save the
georeferenced map. If you need to have the georeferenced map in a different
CRS, then use the Warp tool afterwards.

Arni


Árni Geirsson
*Alta ehf* // +354 582 5000 // +354 897 9549

On 27 February 2017 at 18:09, Stephen Wandling  wrote:

> Earlier I was trying to figure out why Composer wanted to export raster
> files, and I wanted vector.  I finally reduced my 'map' to the raster base
> map and one local shape file, Roads.  With this I found that selecting the
> layer Roads and using "Set Project CRS to this Layer" was causing Composer
> to default to raster output.  A clue!
>
> I had noticed that the raster base map rotated 2 or 3 degrees CW when I
> used "Set Project CRS to this Layer", above.  I also noticed that in
> Composer, if I had not used "Set Project CRS to this Layer", placing a UTM
> grid on my map resulted in the grid being rotated 2 or 3 degrees CCW.  So,
> it appears that the grid is based on the base map?
>
> In reading today's posts, I noted mention of Georeferencer.  Digging into
> this, the tutorials, etc seemed to require having another input, to compare
> points.  I thought I might be able to accomplish this by comparing my Roads
> layer with the raster map.
>
> I loaded my local Roads shape file into a new canvass in QGIS and my
> raster base map into Georeferencer.  I would click a particular
> intersection in georeferencer and it would produce the 'enter coordinates'
> or 'get from map' options.  Selecting the latter, it switched to the map
> canvass and I could zoom in and click the same intersection.  This would
> send me back to the previous menu where the coordinates were filled in and
> I would select OK.  I did this on 4 points.  On the fourth point, I noted
> the red line angled 2 or 3 degrees CW, but quite long.
>
> I saved the points in a file and Started Georeferencing.  The completed
> raster base map came up on the QGIS canvass, along with the Roads shape
> file.
>
> What I saw did not please me.  In some places, the Roads were now falling
> at least 1/2 kilometer off from the base map road locations.  This put them
> in creek ravines and other hillshade elements.  The results were unusable
> for my purposes.
>
> When I had used "Set Project CRS to this Layer", the Roads layer fell onto
> the roads on the raster map.  Streams fell onto their ravines.
>
> Maybe I have to get another base map?  Or maybe my georeferencing method
> was faulty?
>
> Stephen
>
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[Qgis-user] Primitive Troubleshooting

[Stephen Wandling]

Earlier I was trying to figure out why Composer wanted to export raster 
files, and I wanted vector.  I finally reduced my 'map' to the raster 
base map and one local shape file, Roads.  With this I found that 
selecting the layer Roads and using "Set Project CRS to this Layer" was 
causing Composer to default to raster output.  A clue!


I had noticed that the raster base map rotated 2 or 3 degrees CW when I 
used "Set Project CRS to this Layer", above.  I also noticed that in 
Composer, if I had not used "Set Project CRS to this Layer", placing a 
UTM grid on my map resulted in the grid being rotated 2 or 3 degrees 
CCW.  So, it appears that the grid is based on the base map?


In reading today's posts, I noted mention of Georeferencer.  Digging 
into this, the tutorials, etc seemed to require having another input, to 
compare points.  I thought I might be able to accomplish this by 
comparing my Roads layer with the raster map.


I loaded my local Roads shape file into a new canvass in QGIS and my 
raster base map into Georeferencer.  I would click a particular 
intersection in georeferencer and it would produce the 'enter 
coordinates' or 'get from map' options.  Selecting the latter, it 
switched to the map canvass and I could zoom in and click the same 
intersection.  This would send me back to the previous menu where the 
coordinates were filled in and I would select OK.  I did this on 4 
points.  On the fourth point, I noted the red line angled 2 or 3 degrees 
CW, but quite long.


I saved the points in a file and Started Georeferencing.  The completed 
raster base map came up on the QGIS canvass, along with the Roads shape 
file.


What I saw did not please me.  In some places, the Roads were now 
falling at least 1/2 kilometer off from the base map road locations.  
This put them in creek ravines and other hillshade elements.  The 
results were unusable for my purposes.


When I had used "Set Project CRS to this Layer", the Roads layer fell 
onto the roads on the raster map.  Streams fell onto their ravines.


Maybe I have to get another base map?  Or maybe my georeferencing method 
was faulty?


Stephen

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[QGIS-it-user] Nuovo Utente

[Lorena Doria]

Buona serata a tutti, mi sono appena iscritta dopo aver scaricato ed
iniziato a provare QGIS, ed ho già un sacco di cose da chiedervi

La prima è sicuramente questa:
Sto usando QGIS 2.18 su un pc windows 7 mi sono collegata al mio db mssql
dove ho messo una tabella con campo geography che definisce il punto di
quel record
Ne ho quindi creato un layer, ma ..i miei puntini non si vedono!!! :-(

Mi aiutate

Grazi


Lorena
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Re: [Qgis-user] Is there a shortcut to disable and enable snapping during digitizing?

[Matthias Kuhn]

Hi,

In QGIS 3.0 there will be a toolbar icon to enable/disable snapping
quickly. This feature is already in master (nightly-2.99) available.

We have just been working on a keyboard shortcut for this now, it's
waiting for final polish before it goes live. The default key to toggle
snapping is "S", but this is configurable in the keyboard shortcut manager.

Bests

Matthias


On 26/02/2017 12:03, aborruso wrote:
> Hi,
> Thank you to all for all your replies. Than there isn't.
> I think it would be very useful to have this shortcut, for real and long
> digitizing process.
>
>
> John Layt wrote
>> I was working on a plugin a while back to do this, but was told the
>> next release would have it built in, so I stopped. 
> I could add a feature request, but if it will be in the next release I do
> not make it.
> John, are you sure that there will be it?
>
> Best regards,
>
> Andrea
>
>
>
>
>
>
> --
> View this message in context: 
> http://osgeo-org.1560.x6.nabble.com/Is-there-a-shortcut-to-disable-and-enable-snapping-during-digitizing-tp5309255p5309540.html
> Sent from the QGIS - User mailing list archive at Nabble.com.
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Re: [Qgis-user] qgis 2.18.3 not installing on win 10

[Andre Joost]

Am 26.02.2017 um 23:01 schrieb Michael.Dodd:

I tried uninstalling and installing again using the stand alone installer.  
This gave the same error so I uninstalled it.


Then I tried the OSGEO4W installer but it did not install exactly where I asked 
it to, instead it made its own directory on Y (Y:\osgeo_download). It did start 
up once but after that it failed to start and instead gave the same error about 
missing .dll's even though they were present.  I think I had a problem similar 
to this several qgis versions ago but it was then resolved, now the issue seems 
to be back.


This is the \QGIS 2.18\bin\qgis.bat file:


@echo off
call "%~dp0\o4w_env.bat"
@echo off
path %OSGEO4W_ROOT%\apps\qgis\bin;%PATH%
set QGIS_PREFIX_PATH=%OSGEO4W_ROOT:\=/%/apps/qgis
set GDAL_FILENAME_IS_UTF8=YES
rem Set VSI cache to be used as buffer, see #6448
set VSI_CACHE=TRUE
set VSI_CACHE_SIZE=100
set 
QT_PLUGIN_PATH=%OSGEO4W_ROOT%\apps\qgis\qtplugins;%OSGEO4W_ROOT%\apps\qt4\plugins
start "QGIS" /B "%OSGEO4W_ROOT%"\bin\qgis-bin.exe %*

and this is the directory where the relevant .dll's are 
Y:\osgeo_download\apps\qgis\bin
but it says they are missing even though they are present in this directory.



Try to exchange every %OSGEO4W_ROOT% with Y:\osgeo_download, in the 
o4w_env.bat file as well. QGIS_PREFIX_PATH should be set to 
Y:\osgeo_download\apps\qgis


BTW if you have the QGIS shortcuts in the start menu, you can open the 
QGIS folder in the start menu with rightclick -> open, and copy the 
shortcuts from there to your desktop.


HTH,
André Joost




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Re: [QGIS-it-user] Gestore di Stampa. Modificare legenda conservando le operazioni precedenti

[Paolo Cavallini]

Il 27/02/2017 10:06, Marco Spaziani ha scritto:
> ...forse lo espresso male, ma condivido pienamente il tuo invito e
> concordo con te che la cosa migliore da farsi (e che farò appena posso)
> è segnalare il tutto.

grazie. tienici aggiornati per cortesia.

-- 
Paolo Cavallini - www.faunalia.eu
QGIS & PostGIS courses: http://www.faunalia.eu/training.html
https://www.google.com/trends/explore?date=all=IT=qgis,arcgis
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[Qgis-user] Cannot upgrade to 2.18.4 QGIS?

[Chris Buckmaster]

Hi

I have tried to upgrade my QGIS (two times using the 2.18.3 and 2.18.4 
installer files) but it hasn't seemed to have correctly uninstalled version 
2.18.2 when going through the installation process to install the new version.

I am using the Windows 64bit standalone installer - have others found this 
issue? Is this a known problem?

Thanks

Chris



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Re: [Qgis-user] FW: Simple methodology for user / data / map interactivity?

[Bernhard Ströbl]

 this to run a SQL query which to get related
features for example and highlight them on the map view, possibly pan to
the extent of the newly selected feature set.



Does this sound like a plugin – or would that be taking things too far?



Would the best way for the dynamic layer to be setup, to be a view –
empty except when populated by the query and styled to be dominant over
the full set of features?



As a simple example, say I had a district zone system of polygons and I
wanted a user to be able to click on any polygon, and have all the
neighbouring polygons highlighted, centred and fill the map view as
fully as possible. What would be the best / simplest approach to this?



Graeme




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Re: [QGIS-it-user] Gestore di Stampa. Modificare legenda conservando le operazioni precedenti

[Marco Spaziani]

...forse lo espresso male, ma condivido pienamente il tuo invito e concordo
con te che la cosa migliore da farsi (e che farò appena posso) è segnalare
il tutto.

Il giorno 27 febbraio 2017 09:29, Paolo Cavallini 
ha scritto:

> Il 27/02/2017 09:27, Marco Spaziani ha scritto:
> > La vedo esattamente come te. Per ora ben venga e speriamo che duri
> > questo "effetto collaterale", ...fermo restando l'invito di Paolo che è
> > la cosa migliore da fare per non dipendere da questi "trucchetti"
> > fortuiti e del tutto casuali.
>
> scusa se insisto: non sperare che duri, fai qualcosa perché migliori
> saluti
>
> --
> Paolo Cavallini - www.faunalia.eu
> QGIS & PostGIS courses: http://www.faunalia.eu/training.html
> https://www.google.com/trends/explore?date=all=IT=qgis,arcgis
>
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Re: [Qgis-user] maps rotated and reversed.

[Árni Geirsson]

I have found that it is necessary to have the scanned map image oriented
roughly the right way - I don't know what the limit is. In other words that
the georeferencer can not cope with upside down or sideways images. So I
use photo editing software to get the image close and then the
georeferencer works just fine.

Arni


Árni Geirsson
*Alta ehf* // +354 582 5000 // +354 897 9549

On 26 February 2017 at 18:48, Nicolas Cadieux 
wrote:

> Hi,
>
> You have CRS problem.  Your map is probably in a coordinate reference
> system that uses  x,y, but you are probably selecting a CRS that uses y,x.
> Ex: latitude/longitude vs long/lat. that would explain everything.
>
> Nicolas
>
> Le 26 févr. 2017 à 10:33, Randal Hale [via OSGeo.org] <[hidden email]
> > a écrit :
>
> Make sure your CRS of the georeferencer and the CRS of QGIS are the same.
> I bet you're mixing stateplane/utm with WGS84 (4326).
>
> Randy
>
>
> On 02/26/2017 10:04 AM, Charles Barrows wrote:
>
> I am using  the Georeferencer plugin on a jpg map.  Everything goes
> smoothly, but the resultant map file in QGIS has been rotated 90 degrees
> and reversed.  The rotation is easy to handle but I can’t figure out how to
> reverse the reverse.  What am I doing wrong?
>
> Charley
>
>
>
>
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Re: [QGIS-it-user] Gestore di Stampa. Modificare legenda conservando le operazioni precedenti

[Paolo Cavallini]

Il 27/02/2017 09:27, Marco Spaziani ha scritto:
> La vedo esattamente come te. Per ora ben venga e speriamo che duri
> questo "effetto collaterale", ...fermo restando l'invito di Paolo che è
> la cosa migliore da fare per non dipendere da questi "trucchetti"
> fortuiti e del tutto casuali.

scusa se insisto: non sperare che duri, fai qualcosa perché migliori
saluti

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Re: [QGIS-it-user] Gestore di Stampa. Modificare legenda conservando le operazioni precedenti

[Paolo Cavallini]

Il 27/02/2017 09:20, G. Allegri ha scritto:
> L'undo è già presente nel compositore.
> Il fatto che l'annullamento delle modifiche non ripristini il simbolo
> precedente ma quello aggiornato nella mappa è un "effetto collaterale"
> perché nella memoria delle modifiche non viene salvato il simbolo, il
> che può essere risultare un effetto desiderato, come in questo caso, o meno.
> 
> Sarebbe senz'altro utile poter aggiornare i simboli senza dover
> aggiornare l'intera legenda, in modo da non dover ricorrere a questo
> "trucchetto" che potrebbe non funzionare più in una prossima versione.

Appunto: per cortesia sottoponete il problema a qgis-dev.
Grazie.

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Paolo Cavallini - www.faunalia.eu
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Re: [QGIS-it-user] Gestore di Stampa. Modificare legenda conservando le operazioni precedenti

[G. Allegri]

L'undo è già presente nel compositore.
Il fatto che l'annullamento delle modifiche non ripristini il simbolo
precedente ma quello aggiornato nella mappa è un "effetto collaterale"
perché nella memoria delle modifiche non viene salvato il simbolo, il che
può essere risultare un effetto desiderato, come in questo caso, o meno.

Sarebbe senz'altro utile poter aggiornare i simboli senza dover aggiornare
l'intera legenda, in modo da non dover ricorrere a questo "trucchetto" che
potrebbe non funzionare più in una prossima versione.

Giovanni

Il 27 feb 2017 08:55, "Paolo Cavallini"  ha scritto:

Il 26/02/2017 18:34, Marco Spaziani ha scritto:
...
> Stampe) su Modifica --> Annulla e, magicamente, mi è ricomparsa la
> Legenda così come l'avevo editata e implementata in precedenza, compreso
> il testo aggiuntivo e, ancor più magicamente, con il simbolo
> categorizzato che avevo appena modificato in Mappa, correttamente
> "aggiornato". Non so perchè sia successo, ...ma va bene così ;-)

Grazie Marco.
Potresti semplificare il workflow quanto possibile, e riportare questo
in mailing list qgis-dev? Se la funzionalità, in effetti molto utile, è
già presente, credo che vada esposta in modo più appropriato, ad es. con
un pulsante apposito.
Grazie.

--
Paolo Cavallini - www.faunalia.eu
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