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

learn more… | top users | synonyms (2)

1
vote
2answers
38 views

Grass tools not working in QGIS 2.14.3-ESSEN, OSGEO4W

Windows 10 QGIS 2.14.3-ESSEN OSGEO4W install (current) 64-bit Processing toolbox. Grass tools do not work Neither 6 nor 7. 6 makes sense as I do not see OSGEO4W installing it but 7 tools are ...
3
votes
1answer
32 views

QGIS geoprocessing script, ## hand-over processing-specific information error

I have a QGIS python geoprocessing script starting like this: ## Networking = group ## lIn = vector ## lOut = output vector from qgis.core import * v = processing.getObject(lIn) #[...the rest...] ...
2
votes
0answers
40 views

problem using qgis spatial join in a python script or modeler : no results [closed]

I'm trying to create polygons from points layers. Each layer contains one point to avoid troubles due to superposition of polygons. I detailed the context here : How can I add output vector to a list ...
1
vote
0answers
20 views

Merging Shapefiles in a Folder using pyQGIS [duplicate]

I was reading the QGIS Python Programming Cookbook (page 74) trying to learn how to merge shape files because I need to do it for what I'm doing. I was using their example just to try it out though. ...
2
votes
0answers
18 views

difference in behavior between merge from SAGA and merge from QGIS geoalgorithms

I'd like to know what I'm doing wrong with the merge algorithms in Python. I have several shapefiles (polygons) ending in 'LNA', 'LNC', 'LDA', and 'LDC', and I'd like to merge them depending on ...
2
votes
1answer
47 views

How make polygons from lines (polyline to polygon) in QGIS 2.14.3

I'm trying to remember how to do polygons from lines, I remember it was a very simple procedure. have a layer of lines intersecting or touching, use the tool and voila, qgis took the lines layer and ...
4
votes
1answer
105 views

v.kernel is missing under Processing Toolbox GRASS GIS 7 commands

I installed the QGIS Standalone Installer Version 2.14 (64bit), that automatically contains GRASS 7.0.4. I created a map with several layers and rasters in the program called QGIS Desktop 2.14.3 with ...
3
votes
0answers
80 views

Error on running Saga GIS inside QGIS

I have installed QGIS (2.14.3-Essen) along with SAGA GIS (Version: 2.2.7) in Ubuntu (14.04 trusty). I am trying to fill the sinks in a DEM in QGIS processing using SAGA provider. I have used both the ...
1
vote
1answer
54 views

How can I add output vector to a list to loop a geoprocessing on it?

I have about 18000 circular buffers that I want to transform in some kind of a wind rose. To do this, I transform the buffer polygons to lines, create points along the lines on the wind directions ...
2
votes
1answer
34 views

How to use create a plugin that contains a set of processing scripts using Qgis Script feature?

I have some script that I would like to share easily. I have read here that its possible to create a plugin using a set of scripts using "Scripts/Tools group in the Processing toolbox, double-click ...
1
vote
1answer
46 views

PyQGIS Processing - wrong number of parameters

I'm facing a very strange issue from the module Processing using it as a standalone (not in the Qgis python console). I'm trying to create voronoi polygons from a points csv file. I can load my file ...
1
vote
0answers
50 views

QGIS 2.14.3 Processing Dissolve error “local variable 'nElement' referenced before assignment See log for more details”

When I try to use Dissolve in Processing I get this error: "local variable 'nElement' referenced before assignment See log for more details" I have seen this problem reported in: https://hub....
0
votes
1answer
67 views

QGIS Processing Toolbox not valid

I have a 64 bit windows 10 computer with ArcGis 10.2.2 Installed. I just downloaded QGIS the newest version 2.14 64 bit. it downloads but the processing toolbox throws this error Couldn't load ...
1
vote
1answer
53 views

Convert SHP to DGN with ogr2ogr

I want to convert my shp layers into one DGN file using ogr2ogr (QGIS). When I use this tool, I can only select one layer to convert. My problem is I don't know how to select all three layers at the ...
0
votes
0answers
13 views

Single channel Change Detection

I want to write script for Google Earth Engine, which will create bitwise mask of changes. Earlier I made through ScanEx Image Processor and this function is called "Single channel change detection". ...
2
votes
1answer
33 views

Problem using processing.runandload(…)

I'm writing a QGIS plugin using PyQGIS and I have a weird problem. When executing following line of code: processing.runandload("qgis:createpointsalonglines", r"Clipped", 1, 1, 0, r"memory:nodes") ...
1
vote
0answers
24 views

SAGA Merge raster layers error

I have 198 tiles of a DEM from which I want to extract contour lines, but doing the operation 198 times is ungainly. I tried SAGA's Merge raster layers, but it stops into this error: Oooops! The ...
3
votes
1answer
33 views

Add Values to New Column in Attributes Table using Python Console in QGIS

I've added a new column to my table called "STRNAME" using: path = "/Users/shapefiles/roads/" metro_roads = QgsMapLayerRegistry.instance().mapLayersByName('Metro_roads')[0] processing.runalg('qgis:...
2
votes
1answer
83 views

No Grass plugin in plugin manager in Qgis 2.14 on windows 7

I would like to use the v.net.path algorithm from grass7 with processing into qgis 2.14. It's on my new laptop with windows 7 where I installed qgis 2.14.2 desktop with grass 7.0.3. But I don't find ...
2
votes
2answers
73 views

Raster calculator in Process Toolbox Qgis

I am not able to find the Raster Calculator in my process toolbox anymore, even though I worked with the Raster Calculator through the toolbox in the same version of QGIS (2.8) one month ago. It ...
1
vote
1answer
121 views

QGIS python script loop for raster calculator

How can I write a QGIS script for making a loop of raster calculator through a set of rasters? I know I can read multiple raster by applying: lddLrs = qgis.utils.iface.legendInterface().layers() for ...
2
votes
2answers
47 views

How to access the result(s) of a Processing module?

I am experimenting with the QGis Processing toolbox. I open up the module dialogue, set it then parameters and click. If the run succeeds the dialogue is closed automatically and no result(s) are ever ...
2
votes
0answers
25 views

Qgis gdalogr:contour is not generating output

I am trying to use gdal:contour script in Qgis console and then script. Here is code which I tried write to console. raster = QgsRasterLayer('C:/Users/Bulva.user/Desktop/test_raster.asc', "DEM") ...
3
votes
0answers
43 views

QGIS 2.14: Missing list of algs in modeler (processing plugin)

I changed my QGIS-version from 2.8 to 2.14. I am very happy that v.net algs (grass7) are available now as part of the processing plugin. But now there is no list of algs inside the modeler - so no ...
1
vote
1answer
48 views

QGIS processing framework Python loading shapefile

I would like to write a Python script in the QGIS processing framework allowing the download of files from specific addresses. Instead of starting my script with: vectorLyr = vector I would like to ...
4
votes
1answer
88 views

How to write Python code with QList class

I need to write an interpolation script for QGIS. I want use TINInterpolation method from Interpolation plugin. I found class in API documentation but I don't know how to write QList object with ...
3
votes
1answer
79 views

QGIS 2.14 Couldn't load plugin 'processing' due to an error when calling its classFactory() method

I understand that my problem originates from the letters in my username which apparently are non-ascii and very Nordic. I just have absolutely no clue how to get around this. I'm on Windows 10 64bit ...
1
vote
1answer
18 views

Processing “Join by attribute” issue

I don't know what's going wrong when I try to join a shape file with an xls or csv. I do have the same identifier in both files. The joined file has all the expected columns but they are all empty. ...
0
votes
0answers
29 views

How is Reprojection done in QGIS [duplicate]

am using QGIS 2.14.1: How i Reproject a point dataset i have into a different format? eg. wgs84 to local system Am New to QGIS, Switching from ArcGIS to QGIS
3
votes
0answers
47 views

Missed "processing' panel in QGIS 2.12.2 Lyon

I have missing 'processing' panel in my QGIS Lyon version. It happened once some time ago, so I re-installed program then. And now I have the same situation - I've cleaned my QGIS registry key and ...
2
votes
0answers
64 views

Problem using processing.runandload() [closed]

I'm writing a QGIS plugin using PyQGIS and I have a weird problem. When executing following line of code: processing.runandload("qgis:createpointsalonglines", r"Clipped", 1, 1, 0, r"memory:nodes") ...
4
votes
2answers
85 views

What's the correct syntax to use Processing gdalogr:merge from python?

I am using gdalogr:mergein Python console in order to merge to rasters (.tif) But I don't really understand the first parameter, where I have to put two variables. I get the following error: ...
1
vote
0answers
31 views

QGIS 2.14 - Saving Lat/Long csv file to ESRI Shapefile Error [duplicate]

I have a csv file that I bring into QGIS 2.14 with standard lat and long formatting. The file displays fine but when I try to save it as an ESRI shapefile I get an error: Export to vector file failed....
2
votes
0answers
63 views

QGIS Processing algorithms have encoding problems

I use QGIS 2.14.1. I add vector layer from UTF-8 encoded geojson, which is read fine and attribute table show correct characters. If I use QGIS algorithm on this layer (i.e. clip, voronoi, etc) I ...
1
vote
0answers
71 views

QGIS 2.14 Linux/Ubuntu GRASS algorithms - This algorithm cannot be run :-(

Does someone else have the problem that GRASS Tools don't work in QGIS 2.14 Toolbox ? Error: "This algorithm cannot be run :-(" GRASS7 is enabled in Toolbox options and installed (with QGIS-GRASS ...
1
vote
0answers
46 views

QGIS: Release file lock on file used in a processing algorithm at the end of script

I am using runalg (qgis:joinattributesbylocation) on two QgsVectorLayer objects. At the end of my script I'm trying to delete all the files created during the script. I can delete everything except ...
1
vote
1answer
82 views

R kriging in QGIS

I'm trying to work with the R Kriging script in QGIS (processing toolbox). I have installed R before directly to C:. I also have installed the packages raster, rgdal, sp and automap. When I'm starting ...
1
vote
0answers
40 views

How to interpolate (ordinary kriging) large files with QGIS processing

I'm using the Saga ordinary kriging tool as apart of different processing models. The biggest issue I have is the very slow performance. My point shape files have mostly more than 200.00 points (some ...
2
votes
2answers
88 views

Will upgrading my RAM and Processor speed up functions on QGIS Desktop 2.12.0?

I am using QGIS 2.12.0- Lyon (64-bit) at work and have been finding with especially large amounts of data (many vector layers) that all processes on the system have been running slower. I am running ...
2
votes
1answer
46 views

Using Shortcut for QGIS Processing Script

I grabbed code from here to assign shortcuts for quickly changing to preset scales. When I did it for one shortcut, it was working - but then, when applying several ones it didn't anymore - though ...
1
vote
1answer
105 views

QGIS 2.14 - Processing Toolbox slow

Since installing 2.14 (and manually fixing errors with MSYS / Grass 7 carryover from previous installation of 2.12), when I try to search for a command in processing toolbox it appears to be re-...
1
vote
0answers
78 views

Grass processing not configured in OSGEO4w QGIS 2.14.1

I get the below error when I try to use grass processing from within QGIS. The error is given on all commands and I have got this error on 2 machines. I am using windows. "This algorithm cannot ...
2
votes
2answers
227 views

QGIS 2.14.1 Processing Toolbox GRASS 7 .NVIZ Not working

I have a problem with the command GRASS 7 .nviz in QGIS 2.14.1 installed through QGIS-OSGeo4W-2.14.1-1-Setup-x86_64.exe.md5sum all GRASS commands work exept .nviz / nviz7 images: I test with ...
1
vote
1answer
25 views

QGIS GdalUtils runGdal function throws error for second argument

I am trying to use a script provided in the QGIS Python Cookbook by Joel Lawhead - its a simple script that georeferences images based on control points via the gdalwarp function. (p.124 in the book) ...
1
vote
0answers
22 views

Can anyone resolve Plugin Processing from crashing QGIS 2.14 on startup? [duplicate]

Every time I open QGIS Essen I get an error message telling me "Plugin processing will be disabled because it crashed QGIS during the last startup. Please report an issue and re-enable the plugin when ...
5
votes
2answers
128 views

QGIS python processing.runalg Clip returns None

I'm writing a script in pyQGIS, which would emulate measurement of a line by "walking" along it with a compass with constant length. I have a problem with the Clip algorythm from processing module, ...
1
vote
1answer
74 views

Load multiple files from folder for further processing

I'm working on a processing model and I'm looking for a possibility to load multiple shape-files from an Input-folder for further processing (first clip them all to a certain extend, then assign them ...
3
votes
1answer
124 views

Using processing algorithm in QGIS plugin

I'm building a plugin in QGIS, one of its part is processing algorithm: intersection. I want to save the result as memory layer, and then work on it. Following code was working fine, nothing changed (...
5
votes
2answers
192 views

How to find disconnected islands in a road network layer, using QGIS

I have a road network layer that can't route from one side of the layer to the other. Topologically, there is no connectivity between the start and end nodes, probably due to missing links. This ...
4
votes
2answers
72 views

How to select all features with maximum classification value using a processing algorithm?

I am building a Processing Model working with large vector Datasets with classification values. My vector file contains a lot of features (40.000) with one column containing classification values ...