Spatial data processing framework that brings advanced analysis capabilities to QGIS.

learn more… | top users | synonyms (2)

1
vote
1answer
27 views

How to get PostGIS DB name from QGIS layer?

I'm writing a custom Processing script that needs to know which database connection a vector layer resides in. I can't find anywhere in the API a function to return this information from a layer. So I ...
1
vote
1answer
36 views

Is there a way to integrate my own custom tools into the Processing toolbox in QGIS?

Is there a way to integrate my own custom tools into the Processing toolbox in QGIS? I believe I have found where to strategically hack the stock processing scripts to ensure it picks up my custom ...
1
vote
0answers
17 views

Processing Model .model from Ubuntu to windows and “vice versa” Python Error

I have prepared a processing model in Qgis 2.10 under ubuntu 15.04, I tried to test it on a Windows(7) pc with Qgis 2.10 and I got a Python error message, Then I tried the opposite way, I prepared ...
1
vote
1answer
61 views

Where did Processing Algorithms go?

I have recently installed QGIS 2.8.2 on my Windows 8.1 laptop with the stand alone .exe installer. The processing toolbox is missing the GDAL/OGR, GRASS, QGIS algorithms, Saga and the Orfeo Toolbox ...
1
vote
0answers
28 views

Where to find Advanced Python Field Calculator qgis sintax documentation

I am trying to follow some tutorials using Advanced Python field calculator, but when I enter the formula value = $geom.area() / < area> I get syntax error as in picture, while if I substitute ...
0
votes
2answers
31 views

QGIS Processing Scripts Shared Code

I'm on a Windows 7 machine with QGIS 2.8 installed via OSGeo4W. I'm developing several processing scripts that make use of a few common pieces of code. Rather than maintain the code in each individual ...
1
vote
1answer
37 views

Processing modeler: how to dissolve a vector layer and sum the attributes

I have a complex workflow prepared in the processing modeler, but I'm missing one step to link all the model. As said, I need to dissolve a polyline vector in a single line vector that has as ...
1
vote
0answers
11 views

How to pass a token value to QGIS processing modeler?

There are various places in the Processing modeler where I would like to pass the value of a variable. We're iterating through a bunch of features in an input layer. After the processing, we will have ...
1
vote
0answers
66 views

Grass 7 no longer works via the Processing Toolbox in QGIS

When I try to execute a Grass 7 algorithm via the Processing Toolbox in QGIS 2.10, 2.8.2 or 2.8.1, I get the following error: Missing dependency. This algorithm cannot be run :-( QGIS ...
1
vote
0answers
20 views

Is it possible update a shapefile instead create a new one when using Processing?

Using Processing to add or calculate a field it's always necessary create a new shapefile? Is there a way to just update and keep using same layer?
2
votes
1answer
53 views

Processing algorithm fails from Python script

I'm trying to write a Python script performing a geoalgorithm. What is surprising me is the following: I first test the algorithm by QGIS (2.8) interface. In my case, the GRASS interpolator ...
0
votes
0answers
36 views

Does Processing plugin v2.10.1 not recognise SAGA?

Version 2.9.3 of the Processing plugin works fine, I can run the SAGA tools successfully. Updating the Processing plugin to version 2.10.1 results in SAGA disappearing entirely from the toolbox. The ...
2
votes
0answers
24 views

QGIS: distance matrix different outputs

In one of my plugins I would like to use the distance geoprocessing algorithm. When running this algorithm from the menu Vector->Analysis Tools->Distance Matrix I get a different output than running ...
1
vote
1answer
68 views

Why is SAGA from the Processing Plugin not recognised?

Similar to this post: SAGA algorithms don't work in QGIS 2.8 except the fact that SAGA does not appear at all in the Processing Toolbox: As a check, I used the Python Console with the following ...
1
vote
0answers
39 views

compare column to atributes in a loop in pyqgis processing

I am creating a script in processing qgis. I am running the interpolation algorithm.I have two tables table A and table B. Table A contains attributes like A_test,B_test up to Z_test. Table B contains ...
1
vote
0answers
22 views

Translate old QGIS (2.2) Sextante model to newer version

Hey there (I guess Victor :-)) I really like the processing toolbox and have realized several models. I also developed some bigger models in QGIS 2.2 / with the former processing toolbox. Since the ...
2
votes
2answers
76 views

How to run Processing qgis:extractbylocation?

I try to use the processing 'qgis:extractbylocation' in QGIS 2.8.2 from the QGIS algorithm provider. import processing # import the layers by a given uri inputlayer = QgsVectorLayer(uriTr.uri(), ...
2
votes
1answer
25 views

Last SEXTANTE (Processing) update results in missing RScripts examples

I have installed today the new version of the Processing plugin on QGIS 2.8 (on Windows 7 x64) and I cannot anymore find the RScripts example that were available (and functioning) before the udpate. ...
1
vote
1answer
76 views

Cannot install “Processing” plugin on MacOS + QGIS 2.9.3, fresh install

I have just installed a new MacBook Pro and QGIS, everything is fine but this strange error if I try updating or reinstalling the "Processing" plugin. The plugin is broken. Python said: cannot ...
2
votes
0answers
42 views

QGIS' Join Attributes by Location not working from Python script

I have a shapefile with points, and a shapefile with polygons. I want to sum the attribute value of all points that are within a certain polygon, and I'd like to do this for each polygon in my ...
2
votes
1answer
36 views

How to clip a raster by extent using Processing from the Python console?

I want to clip a raster by extent in QGIS with the python console. Here is the description given in the documentation. You have to use the following input parameter: Input layer Nodata value ...
2
votes
1answer
46 views

How to add my own GRASS algorithms to Processing?

I need to use algorithm r.bioclimatic from GRASS in QGIS but I see that this algorithm don't exist in Processing Toolbox. A search a way of add this algorithm to Processing and in GRASS and Sextante ...
3
votes
1answer
42 views

How to access CRS of shapefile in standalone script?

I'm trying to access the CRS of a layer and use this to create a grid. I followed the answer in this post which works great in QGIS but I would like it to work in a standalone script. Here is a ...
1
vote
1answer
42 views

How to downgrade from Processing 2.6 to 2.2?

I have QGIS 2.8.2 installed and Processing Toolbox 2.6. I want to test a thing and I need to install processing Toolbox 2.2 in QGIS 2.8.2. Is it possible? How can I do that?
1
vote
2answers
70 views

How to use subprocess module to run QGIS toolbox modules

I've been trying to use subprocess for a while now, but can't get it to work when calling QGIS modules. Here's my script: import subprocess call("processing.runalg('gdalogr:merge', ...
0
votes
0answers
94 views

QGIS 2.8.X problem. Couldn't load plugin processing due to an error when calling its classFactory() method

I am running windows 7 64 bit and I have a problem with the processing plugin in QGIS 2.8. Following error appears when starting: ...
1
vote
0answers
44 views

Merge vector layers problem with german names (ä, ü, ö…)

When I'm trying to merge (saga merge layers tool) some shape files I get an error log 'ascii' codec can't decode byte 0xfc in position 91: ordinal not in range(128) See log for more details ...
0
votes
0answers
6 views

Unlock a file after using GRASS runalg

I am not allowed to supress a shp file after using: processing.runalg("grass:v.surf.idw","the_file_i_want_to_delete.shp",12,2,"Arithmetic",False,"-125,-65,23,50",0.2,-1,0.001,"output") Any idea? I ...
3
votes
1answer
126 views

How do I set up the R Script folder in QGIS 2.8.1 Processing Toolbox (Advanced Interface)?

I am currently lacking the R Script folder in my processing toolbox under the advanced interface tab. I suspect this could be a result of the firewall in my company's wifi. I already have R ...
1
vote
1answer
106 views

Missing processing menu in QGIS?

I'm sure there is a really simple explanation to this but haven't found any pointers on this forum or elsewhere. I seem to have lost the 'processing' menu from QGIS and can't figure out how/why!? Any ...
1
vote
0answers
59 views

Is there any way to set a processing extent for QGIS:Voronoipolygon?

I was playing around with the QGIS:voronoipolygons command line function from QGIS and noticed that there was no option for setting the processing extent. This causes QGIS to pick the minimum extent ...
1
vote
0answers
89 views

Is there way to define processing extent in QGIS?

Is it possible to define the extent of a processing tool, like it is in the "Environments" in ArcGIS? For example "Same as Display, or "Same as Layer..".
2
votes
0answers
80 views

Is it possible to use memory layers in QGIS processing algorithms?

I am building a QGIS plugin that connects to a MySQL database in the local network, and then adds a subset of one of the tables to an in-memory layer; the subset is based on data currency (only taking ...
2
votes
1answer
177 views

Processing plugin Python error on startup of QGIS 2.8.1

I've been running QGIS with no issues for several versions now, but after I upgraded to 2.8.1 Wien I had trouble running two plugins: qgis2leaf (which I believe depends on Processing) and Processing. ...
1
vote
1answer
61 views

How to remove “ERROR 1” messages from a standalone QGIS script?

I am running a standalone script for QGIS which creates a high resolution grid and clips shapefiles onto it. Works perfect if the cell width and height have a high values (in my case, >200m for both). ...
1
vote
1answer
85 views

QGIS processing script: Move points by specified distance and add segment

I try to move points (they come as WGS84, but I'm not sure if it works with unprojected CRS) by a specified distance and connect original and new point with a line segment with the below script, but ...
1
vote
0answers
69 views

Put output of SAGA algorithm of Processing model in R script

I'm trying to combine the Variogram Cloud model of SAGA with an R script inside a Processing model. First, the R script is: ##Vector processing=group ##showplots ##Layer=table ##X=Field Layer ...
2
votes
1answer
151 views

Standalone script looping incorrectly?

Following on from my previous question, I would like the script to do the following (includes illustration): Search for the first shapefile (Paris (O).shp) in Country_France > Original files and ...
2
votes
2answers
158 views

How to use `layer.getFeatures()` in a standalone script?

I am following the QGIS Cookbook and this post where it concerns reading attributes from layers. I would like to exploit this method and implement it into a standalone script. Essentially, I want to ...
3
votes
2answers
202 views

Using folder wildcards to copy files with Python

I would like to copy the data of one specific shapefile from a specific folder ("Grid") to a number of folders containing the name "Country". The country shapefiles would keep their original name. ...
1
vote
1answer
43 views

Rename output shapefiles in PyQGIS

I have a shapefile which resides in a folder, gets processed and the output is saved in another folder. Before the output, I would like to rename the shapefile slightly differently from the original: ...
0
votes
1answer
46 views

Script not processing shapefiles from one folder to another

I am working on a script which takes shapefiles from one folder called "Original files", process them and then output the results into another folder named "Processed files. I asked a question on how ...
1
vote
1answer
49 views

Can you change the layer name of an output vector from a processing script in QGIS?

I define an input csv file and an output like so in my processing script: ##Input_CSV_File=file ##Output_Shapefile=output vector The output shapefile is added to the map automatically when the ...
1
vote
2answers
165 views

How to replace VectorWriter with QgsVectorFileWriter?

Within QGIS 2.8.1 I found within the Processing Toolbox a script called "Points on crossing lines" which should exactly as it is named. Unfortunately it needs processing.core.VectorWriter which I ...
1
vote
1answer
115 views

Use raster memory layer from QGIS processing result

I want to apply subsequent QGIS raster processing algorithms in a python script. I want to use memory layers for intermediate calculation results since I am only interested in the end result. As ...
2
votes
1answer
145 views

Why processing.runalg(“gdalogr:rasterize”…) is not creating out files when running in the QGIS 2.6.0 console?

I want to use the QGIS python scripting functions to turn to rasterize a point vector using many different dimensions. Right now my code looks like this: import processing RasterPixelSize = ...
2
votes
0answers
24 views

Extract from a linestring layer, groups of linestrings to a multilinestring objects layer

I've got a linestring layer with thousands of linestrings. I want to extract groups of linestrings to individual multilinestring objects. In the following picture you can see a part of the layer ...
3
votes
3answers
569 views

SAGA installation in QGIS 2.8 on debian linux

I install QGIS 2.8 in debian (linux) through nightly jessie (qgis testing) and I see that SAGA is not in processing toolbox, so I install saga gis software but still it doesn't appear in processing. ...
0
votes
1answer
85 views

Cannot rename output file using standalone script for QGIS

I would like to rename all output files after my script has finished processing them by adding "(A)" after their file name (eg. Layer.shp -> Layer (A).shp). I received an answer from this post on the ...
1
vote
1answer
175 views

QGIS (2.6.1) Processing Toolbox InitGui error after changing /Users folder on Mac OSX

Using: Mac OSX 10.9.4 QGIS 2.6.1 I had previously installed QGIS and had everything running fine. My home directory was /Users/rowanbado, but for another application I had to add an ...