Re: [Qgis-user] Issue with rule-based display and sub categories

[Patrick Dunford]

You should file a bug report at

https://issues.qgis.org/projects/qgis/issues/new

You will need to sign up for an account if you haven't logged onto the 
site already.


Before logging a new report, use the search function to check if 
anything similar already exists.



On 18/04/18 15:20, Laurence Béchet wrote:

Hi all,

I have a complex style display rule-based with sub categories. I turn 
on and off some of these sub categories depending on what I want to 
display. Unfortunately, when I tun off a sub category the symbol is 
still displayed - only with no color ...
I strongly think that it used to work with the last year qgis versions 
...


Happens with both latest 2.18 and 3.0
Windows 8 pro.

Any help would be welcome. It's for a report that I have to issue 
quite soon ...

I can provide the style or whatever else which suits.

Kind regards
Laurence
ARK IN THE PARK Volunteer Co-Ordinator
Cascades Ranger Station
Falls Road, Waitakere
New Zealand

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[Qgis-user] Export reflectance value for every pixel in a zone

[Joshua Rust]

Hi,

I am working with an agricultural research team analyzing multispectral
imagery taken from a UAV over fields containing plots with different
nitrogen treatments. I created a grid over my geotiff in QGIS, and have run
zonal statistics on this layer and compared the output from this to actual
leaf analysis to derive a correlation. That is looking nice.
What I wish to do now, however, is to obtain *each* individual reflectance
value for *each* pixel in my grid plots. So, for example, zonal statistics
tells me there are 22348 pixels in a plot and it tells me the max, min,
median etc. I would like to see the values for each of the 22348 pixels and
work with that. It will be a monstrous file I know but I can live with that.
Is there a plugin that will quickly export this info for me to .csv or txt?

Cheers

Josh

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[Qgis-user] Issue with rule-based display and sub categories

[Laurence Béchet]

Hi all,

I have a complex style display rule-based with sub categories. I turn on 
and off some of these sub categories depending on what I want to 
display. Unfortunately, when I tun off a sub category the symbol is 
still displayed - only with no color ...

I strongly think that it used to work with the last year qgis versions ...

Happens with both latest 2.18 and 3.0
Windows 8 pro.

Any help would be welcome. It's for a report that I have to issue quite 
soon ...

I can provide the style or whatever else which suits.

Kind regards
Laurence
ARK IN THE PARK Volunteer Co-Ordinator
Cascades Ranger Station
Falls Road, Waitakere
New Zealand

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Re: [Qgis-user] Clip Raster by Mask Layer algorithm not working when part of processing model

[Nyall Dawson]

On 18 April 2018 at 06:03, Phil Ribbens  wrote:
> Hi,
>
> I'm trying to include the “Clip raster by mask layer” algorithm in a
> processing model, but I can’t get it to work. What’s weird is that when I
> run the algorithm by itself (i.e. not as part of a model), it works fine.
>
> Below are the logs of each (when I run it by itself and when I run it as
> part of a model). From studying these it seems like the only difference (and
> what seems to be causing the problem) is that when the algorithm is run from
> within a model the path to the MASK layer isn’t being included in the GDAL
> command. Anybody have any idea why? Am I doing something wrong? Is it a bug?

This is a known issue in 3.0.1 - it will be fixed in 3.0.2

Nyall

>
> Thanks,
> Phil Ribbens
>
>
> Running Clip raster by mask layer by itself (works fine)
> Processing algorithm…
> AlgorithmDialog
> Input parameters:
> { 'INPUT' :
> '/var/folders/10/qfg4mkl127gcxgmpr82tl1xcgq/T/processing_c893e43e9931410397ab42a423fd9d61/e27038e2ea2f4b42842aaacf3c6bf15c/OUTPUT.tif',
> 'MASK' : '/Users/philipribbens/Dropbox/work/QGIS plugin for
> Key-Log/lower_roanoke_subbasin.shp', 'NODATA' : 255, 'ALPHA_BAND' : False,
> 'CROP_TO_CUTLINE' : True, 'KEEP_RESOLUTION' : False, 'OPTIONS' : '',
> 'DATA_TYPE' : 0, 'OUTPUT' :
> '/var/folders/10/qfg4mkl127gcxgmpr82tl1xcgq/T/processing_6c6a3f6013994c2eafbaf28a231297a3/44f299a602e34ef8a666e6848ff95658/OUTPUT.tif'
> }
>
> GDAL command:
> gdalwarp -ot Byte -of GTiff -cutline "/Users/philipribbens/Dropbox/work/QGIS
> plugin for Key-Log/lower_roanoke_subbasin.shp" -crop_to_cutline -dstnodata
> 255.0
> /var/folders/10/qfg4mkl127gcxgmpr82tl1xcgq/T/processing_c893e43e9931410397ab42a423fd9d61/e27038e2ea2f4b42842aaacf3c6bf15c/OUTPUT.tif
> /var/folders/10/qfg4mkl127gcxgmpr82tl1xcgq/T/processing_6c6a3f6013994c2eafbaf28a231297a3/44f299a602e34ef8a666e6848ff95658/OUTPUT.tif
> GDAL command output:
> Copying color table from
> /var/folders/10/qfg4mkl127gcxgmpr82tl1xcgq/T/processing_c893e43e9931410397ab42a423fd9d61/e27038e2ea2f4b42842aaacf3c6bf15c/OUTPUT.tif
> to new file.
> Creating output file that is 3642P x 2860L.
> Processing input file
> /var/folders/10/qfg4mkl127gcxgmpr82tl1xcgq/T/processing_c893e43e9931410397ab42a423fd9d61/e27038e2ea2f4b42842aaacf3c6bf15c/OUTPUT.tif.
> Using internal nodata values (e.g. 255) for image
> /var/folders/10/qfg4mkl127gcxgmpr82tl1xcgq/T/processing_c893e43e9931410397ab42a423fd9d61/e27038e2ea2f4b42842aaacf3c6bf15c/OUTPUT.tif.
> 0...10...20...30...40...50...60...70...80...90...100 - done.
> Execution completed in 0.65 seconds
> Results:
> {'OUTPUT':  {'sink':/var/folders/10/qfg4mkl127gcxgmpr82tl1xcgq/T/processing_6c6a3f6013994c2eafbaf28a231297a3/44f299a602e34ef8a666e6848ff95658/OUTPUT.tif,
> 'createOptions': {'fileEncoding': 'System'}}>}
>
> Loading resulting layers
> Algorithm 'Clip raster by mask layer' finished
>
>
>
> Running Clip raster by mask layer as part of a model (doesn’t work)
> Processing algorithm…
> AlgorithmDialog
> Input parameters:
> { 'inputrasterlayer' :
> '/var/folders/10/qfg4mkl127gcxgmpr82tl1xcgq/T/processing_c893e43e9931410397ab42a423fd9d61/e27038e2ea2f4b42842aaacf3c6bf15c/OUTPUT.tif',
> 'maskvectorlayer' : '/Users/philipribbens/Dropbox/work/QGIS plugin for
> Key-Log/lower_roanoke_subbasin.shp', 'gdal:cliprasterbymasklayer_1:Final
> clipped raster' :
> '/var/folders/10/qfg4mkl127gcxgmpr82tl1xcgq/T/processing_6c6a3f6013994c2eafbaf28a231297a3/3b9e2df02eca4aa6b8f6476df78cdf9f/gdal:cliprasterbymasklayer_1:Final
> clipped raster.tif' }
>
> Prepare algorithm: gdal:cliprasterbymasklayer_1
> Running Clip raster by mask layer [1/1]
> Input Parameters:
> { ALPHA_BAND: False, CROP_TO_CUTLINE: True, DATA_TYPE: 0, INPUT:
> '/var/folders/10/qfg4mkl127gcxgmpr82tl1xcgq/T/processing_c893e43e9931410397ab42a423fd9d61/e27038e2ea2f4b42842aaacf3c6bf15c/OUTPUT.tif',
> KEEP_RESOLUTION: False, MASK: '/Users/philipribbens/Dropbox/work/QGIS plugin
> for Key-Log/lower_roanoke_subbasin.shp', NODATA: 255, OPTIONS: '', OUTPUT:
> '/var/folders/10/qfg4mkl127gcxgmpr82tl1xcgq/T/processing_6c6a3f6013994c2eafbaf28a231297a3/3b9e2df02eca4aa6b8f6476df78cdf9f/gdal:cliprasterbymasklayer_1:Final
> clipped raster.tif' }
> GDAL command:
> gdalwarp -ot Byte -of GTiff -cutline -crop_to_cutline -dstnodata 255.0
> /var/folders/10/qfg4mkl127gcxgmpr82tl1xcgq/T/processing_c893e43e9931410397ab42a423fd9d61/e27038e2ea2f4b42842aaacf3c6bf15c/OUTPUT.tif
> "/var/folders/10/qfg4mkl127gcxgmpr82tl1xcgq/T/processing_6c6a3f6013994c2eafbaf28a231297a3/3b9e2df02eca4aa6b8f6476df78cdf9f/gdal:cliprasterbymasklayer_1:Final
> clipped raster.tif"
> GDAL command output:
> ERROR 1: Cannot open -crop_to_cutline.
> OK. Execution took 0.196 s (1 outputs).
> Model processed OK. Executed 1 algorithms total in 0.372 s.
> Execution completed in 0.41 seconds
> Results:
> {'gdal:cliprasterbymasklayer_1:Final clipped raster':
>  {'sink':/var/folders/10/qfg4mkl127gcxgmpr82tl1xcgq/T/processing_6c6a3f6013994c2ea

[Qgis-user] Clip Raster by Mask Layer algorithm not working when part of processing model

[Phil Ribbens]

Hi,

I'm trying to include the “Clip raster by mask layer” algorithm in a processing 
model, but I can’t get it to work. What’s weird is that when I run the 
algorithm by itself (i.e. not as part of a model), it works fine.

Below are the logs of each (when I run it by itself and when I run it as part 
of a model). From studying these it seems like the only difference (and what 
seems to be causing the problem) is that when the algorithm is run from within 
a model the path to the MASK layer isn’t being included in the GDAL command. 
Anybody have any idea why? Am I doing something wrong? Is it a bug? 

Thanks,
Phil Ribbens


Running Clip raster by mask layer by itself (works fine)
Processing algorithm…
AlgorithmDialog
Input parameters:
{ 'INPUT' : 
'/var/folders/10/qfg4mkl127gcxgmpr82tl1xcgq/T/processing_c893e43e9931410397ab42a423fd9d61/e27038e2ea2f4b42842aaacf3c6bf15c/OUTPUT.tif',
 'MASK' : '/Users/philipribbens/Dropbox/work/QGIS plugin for 
Key-Log/lower_roanoke_subbasin.shp', 'NODATA' : 255, 'ALPHA_BAND' : False, 
'CROP_TO_CUTLINE' : True, 'KEEP_RESOLUTION' : False, 'OPTIONS' : '', 
'DATA_TYPE' : 0, 'OUTPUT' : 
'/var/folders/10/qfg4mkl127gcxgmpr82tl1xcgq/T/processing_6c6a3f6013994c2eafbaf28a231297a3/44f299a602e34ef8a666e6848ff95658/OUTPUT.tif'
 }

GDAL command:
gdalwarp -ot Byte -of GTiff -cutline "/Users/philipribbens/Dropbox/work/QGIS 
plugin for Key-Log/lower_roanoke_subbasin.shp" -crop_to_cutline -dstnodata 
255.0 
/var/folders/10/qfg4mkl127gcxgmpr82tl1xcgq/T/processing_c893e43e9931410397ab42a423fd9d61/e27038e2ea2f4b42842aaacf3c6bf15c/OUTPUT.tif
 
/var/folders/10/qfg4mkl127gcxgmpr82tl1xcgq/T/processing_6c6a3f6013994c2eafbaf28a231297a3/44f299a602e34ef8a666e6848ff95658/OUTPUT.tif
GDAL command output:
Copying color table from 
/var/folders/10/qfg4mkl127gcxgmpr82tl1xcgq/T/processing_c893e43e9931410397ab42a423fd9d61/e27038e2ea2f4b42842aaacf3c6bf15c/OUTPUT.tif
 to new file. 
Creating output file that is 3642P x 2860L. 
Processing input file 
/var/folders/10/qfg4mkl127gcxgmpr82tl1xcgq/T/processing_c893e43e9931410397ab42a423fd9d61/e27038e2ea2f4b42842aaacf3c6bf15c/OUTPUT.tif.
 
Using internal nodata values (e.g. 255) for image 
/var/folders/10/qfg4mkl127gcxgmpr82tl1xcgq/T/processing_c893e43e9931410397ab42a423fd9d61/e27038e2ea2f4b42842aaacf3c6bf15c/OUTPUT.tif.
 
0...10...20...30...40...50...60...70...80...90...100 - done. 
Execution completed in 0.65 seconds
Results:
{'OUTPUT': }

Loading resulting layers
Algorithm 'Clip raster by mask layer' finished



Running Clip raster by mask layer as part of a model (doesn’t work)
Processing algorithm…
AlgorithmDialog
Input parameters:
{ 'inputrasterlayer' : 
'/var/folders/10/qfg4mkl127gcxgmpr82tl1xcgq/T/processing_c893e43e9931410397ab42a423fd9d61/e27038e2ea2f4b42842aaacf3c6bf15c/OUTPUT.tif',
 'maskvectorlayer' : '/Users/philipribbens/Dropbox/work/QGIS plugin for 
Key-Log/lower_roanoke_subbasin.shp', 'gdal:cliprasterbymasklayer_1:Final 
clipped raster' : 
'/var/folders/10/qfg4mkl127gcxgmpr82tl1xcgq/T/processing_6c6a3f6013994c2eafbaf28a231297a3/3b9e2df02eca4aa6b8f6476df78cdf9f/gdal:cliprasterbymasklayer_1:Final
 clipped raster.tif' }

Prepare algorithm: gdal:cliprasterbymasklayer_1
Running Clip raster by mask layer [1/1]
Input Parameters:
{ ALPHA_BAND: False, CROP_TO_CUTLINE: True, DATA_TYPE: 0, INPUT: 
'/var/folders/10/qfg4mkl127gcxgmpr82tl1xcgq/T/processing_c893e43e9931410397ab42a423fd9d61/e27038e2ea2f4b42842aaacf3c6bf15c/OUTPUT.tif',
 KEEP_RESOLUTION: False, MASK: '/Users/philipribbens/Dropbox/work/QGIS plugin 
for Key-Log/lower_roanoke_subbasin.shp', NODATA: 255, OPTIONS: '', OUTPUT: 
'/var/folders/10/qfg4mkl127gcxgmpr82tl1xcgq/T/processing_6c6a3f6013994c2eafbaf28a231297a3/3b9e2df02eca4aa6b8f6476df78cdf9f/gdal:cliprasterbymasklayer_1:Final
 clipped raster.tif' }
GDAL command:
gdalwarp -ot Byte -of GTiff -cutline -crop_to_cutline -dstnodata 255.0 
/var/folders/10/qfg4mkl127gcxgmpr82tl1xcgq/T/processing_c893e43e9931410397ab42a423fd9d61/e27038e2ea2f4b42842aaacf3c6bf15c/OUTPUT.tif
 
"/var/folders/10/qfg4mkl127gcxgmpr82tl1xcgq/T/processing_6c6a3f6013994c2eafbaf28a231297a3/3b9e2df02eca4aa6b8f6476df78cdf9f/gdal:cliprasterbymasklayer_1:Final
 clipped raster.tif"
GDAL command output:
ERROR 1: Cannot open -crop_to_cutline. 
OK. Execution took 0.196 s (1 outputs).
Model processed OK. Executed 1 algorithms total in 0.372 s.
Execution completed in 0.41 seconds
Results:
{'gdal:cliprasterbymasklayer_1:Final clipped raster': 
}

Loading resulting layers
The following layers were not correctly generated.
/var/folders/10/qfg4mkl127gcxgmpr82tl1xcgq/T/processing_6c6a3f6013994c2eafbaf28a231297a3/3b9e2df02eca4aa6b8f6476df78cdf9f/gdal:cliprasterbymasklayer_1:Final
 clipped raster.tif
You can check the 'Log Messages Panel' in QGIS main window to find more 
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Re: [Qgis-user] Simple curves

[Andreas Neumann]

Hi Marco,

When you say "curves" - do you mean "circular arcs" - I assume.

Yes - it is possible.

If you want to preserve curves, you'd have to choose a data provider 
capable of storing curves. At the moment, the only two data formats with 
curves supported in QGIS, are Postgis and Geopackage, provided that you 
have a recent version of GDAL and QGIS. Editing curves is part of the 
normal editing tools (advanced digitizing toolbar). Maybe GML support 
curves - but I don't think you can edit GML in OGR/QGIS - I may be wrong 
though.


However, you could create curves also for data providers that don't 
support curves. In that case your curve gets segmented into many short 
lines - and as a consequence, you can't edit the curve efficiently, once 
it is created.


There is, however, a drawback if you use curves - basically whenever you 
do something geometry-related, other than plain editing or display of 
the data, it will be stroked - e.g. if you split or merge a feature 
containing curves, it will be - again be segementized. This is because 
the underlying geometry libraries (GEOS) can't handle curves. In such 
cases where GEOS is used, QGIS has to segmentize the data before feeding 
it into GEOS.


Greetings,

Andreas


On 17.04.2018 16:07, Marco Dinges wrote:

Hey guys,

is it possible to create simple curves with, for example, three Points 
and a radius?



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Re: [Qgis-user] Simple curves

[Frank Broniewski]

Hi Marco,

in QGIS 3 there is a special toolbar for forms which allows you to design 
circles, arcs and so forth.
For QGIS 2 there are some plugins which allow you to do so, namely QAD and 
cadtools.

HTH
Frank

Dipl. Geogr. Frank Broniewski
Waldhölzbacher Str. 51
66679 Losheim am See
06872 509 068 4
0176 611 26 9 2 6
www.frankbroniewski.com

Von: Qgis-user  Im Auftrag von Marco Dinges
Gesendet: Dienstag, 17. April 2018 16:07
An: qgis-user@lists.osgeo.org
Betreff: [Qgis-user] Simple curves

Hey guys,

is it possible to create simple curves with, for example, three Points and a 
radius?
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[Qgis-user] Simple curves

[Marco Dinges]

Hey guys,

is it possible to create simple curves with, for example, three Points and
a radius?
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Re: [Qgis-user] Stastics/percentage raster layers

[Richard McDonnell]

Hi Hanna,
The Link below, should help

https://gis.stackexchange.com/questions/83407/how-to-extract-pixel-value-counts-from-a-raster-in-qgis

Regards,

Richard.



On 17/04/2018 14:21, Hanna nengerman wrote:

Dear All,

I am using QGIS version: 2.8.2-Wien.

In my project I have multiple raster layers. With one of those raster layers I 
did the following calculation:
‘Raster layer’ = 0

This follows in a layer with 0 and 1 values. Where 0 stands for ‘false’ and 1 
stands for ‘true’.
My question is: if it is possible to get the statistics from the resulting 
layer.
I would also like to know if it is possible to get the amount of 0 or 1 values 
of that resulting layer, preferably the percentage.

I hope that someone can help me!

Kind regards,

Hanna
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[Qgis-user] Stastics/percentage raster layers

[Hanna nengerman]

Dear All,

I am using QGIS version: 2.8.2-Wien. 

In my project I have multiple raster layers. With one of those raster layers I 
did the following calculation:
‘Raster layer’ = 0 

This follows in a layer with 0 and 1 values. Where 0 stands for ‘false’ and 1 
stands for ‘true’.
My question is: if it is possible to get the statistics from the resulting 
layer.
I would also like to know if it is possible to get the amount of 0 or 1 values 
of that resulting layer, preferably the percentage. 

I hope that someone can help me!

Kind regards,

Hanna 
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[Qgis-user] Cross-classification and tabulation tool

[Phil Ribbens]

Hi,

I’m trying to use SAGA’s "Cross-classification and tabulation” tool from the 
processing toolbox, and based on the documentation 
(http://www.saga-gis.org/saga_tool_doc/6.3.0/grid_analysis_13.html 
) and this 
example I found (https://gis.stackexchange.com/a/264242/117412 
) I’m expecting it to output 
both a grid and a table. But every time I’ve tried it (with various inputs) it 
only outputs a grid. The UI doesn’t even show an output parameter for the table 
(only for the grid).

So why doesn’t the "Cross-classification and tabulation” tool output a table?

I’m using QGIS3.0.0 on Mac OS 10.13.3.

Thanks for any help anyone can provide,
Phil Ribbens___
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Re: [Qgis-user] QGIS & CityGML?

[Elstermann, Mike]

THX! :-)
mikeE.

> Am 16.04.2018 um 09:55 schrieb b.j.kob...@utwente.nl:
> 
> Reading CityGML is possible, it is after all well-behaved GML. Using GDAL or 
> better using the tudelft.nl tools mentioned by Tobias to convert it to a 
> PostGIS database. And visualising it then is probably also OK, but only in 
> 2D, not the way I suspect you’d want to, i.e.  in a 3D-viewing environment...
>  
>  
> --
> Barend Köbben
>  
> On 16/04/2018, 09:41, "Qgis-user on behalf of Tobias Wendorff" 
>  oftobias.wendo...@tu-dortmund.de> wrote:
>  
> Hi Mike.
>  
> Am Mo, 16.04.2018, 09:34 schrieb Elstermann, Mike:
>> How can I read/visualize CityGML in QGIS?
>  
> CityGML exists in several flavors, I don't think, QGIS supports
> it the native way. You have to use FME to convert it or try it
> the GDAL way. EvenR has added much GMLAS in the past, which makes
> it able to parse some kind of CityGML-stuff:
>  
> http://www.gdal.org/drv_gmlas.html
>  
> https://3d.bk.tudelft.nl/svitalis/citygml/gdal/2017/07/24/messing-around-with-citygml-on-gdal-2.2.html
>  
> HTH,
> Tobias
>  
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Re: [Qgis-user] no python console in QGIS 3 Ubuntu 17.10

[Patrick Dunford]

If you use the Ubuntugis packages and they break the installation 
because of their different upgrade cycle the answer to that is to use 
apt pinning to block the automatic upgrade in the package management system.



The point made with Ubuntugis is the same as if you were getting the 
packages from Ubuntu itself. The update cycle for Ubuntugis or Ubuntu is 
not controlled by the Qgis project.



You are not compelled to use the Ubuntugis for the LTS versions of 
Ubuntu but then you will get an older version of Qgis installed on your 
computer. So there is a very straightforward set of choices that can be 
made.



On 17/04/18 06:11, Micha Silver wrote:




--
Micha Silver
Ben Gurion Univ.
Sde Boker, Remote Sensing Lab
cell: +972-523-665918


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