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

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0
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1answer
48 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
37 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
32 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
17 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
25 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] ...
2
votes
1answer
49 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
64 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
109 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
41 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 ...
1
vote
0answers
23 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
40 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
45 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
82 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
49 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
17 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
42 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
73 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 ...
2
votes
0answers
60 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
61 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
39 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
74 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
30 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
79 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
44 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
96 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 ...
0
votes
0answers
61 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
187 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
111 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
72 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
115 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
166 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
67 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 ...
1
vote
0answers
29 views

Contour Extraction from Scanned Raster Image in Qgis

I have a scanned raster image containing contours and rivers. I am trying to use qgis to extract these contour and river polylines for analysis. As a start I was thinking of the following process ...
1
vote
0answers
24 views

Using model precessing save from qgis into qgis python plugin

I would like to know if there is anyway to load from a QGIS python script a .model file and run it through the processing.runalg method as it seems that we lost the capability to save our model as a ...
6
votes
1answer
96 views

Difference between Landsat 7 and Landsat 8 TOA reflectance computation

In section 3.1 of this article it is explained how the Top of Atmosphere Reflectance for Landsat 7 and Landsat 8 are computed. The equation for Landsat 8 is not mentioned explicitly, but can be found ...
1
vote
1answer
81 views

How do I merge layers using an external Python script to call the processing module?

This is what I'm trying to run: import sys, glob # Prepare the environment from qgis.core import * # qgis.core must be imported before PyQt4.QtGui!!! from PyQt4.QtGui import * app = QApplication([]) ...
3
votes
0answers
143 views

QGIS 2.14 Processing plugin crashes - TypeError: must be string, not None

I've recently installed 2.14, and it worked fine for the first couple of days (Appart from Grass tools), including several program and computer reboots. Today I had this error show up Couldn't load ...
6
votes
0answers
98 views

Can a memory layer be used as an input and/or output with runalg?

Can a memory layer be used as an input and/or output with runalg? With runandload I get this to work: processing.runandload("qgis:mergevectorlayers","memory:bufferOne", "memory:bufferTwo", ...
3
votes
3answers
1k views

QGIS 2.14 standalone GRASS provider missing Msys folder, can't execute tools

In QGIS 2.12 and down, when one went about manually setting the GRASS provider folder paths, this was the way to do it In GIS 2.14 there is no Msys folder in the same path (...\apps\msys) or any ...
2
votes
1answer
501 views

QGIS 2.14 GRASS geoalgorithms don't work?

I instaled qgis 2.14 and grass geoalgorithms dont work. Only 160 geoalgorithms and should be 168. MsBox: Missing dependensy, It seems that GRASS is not correctly installed and configured in your ...
2
votes
0answers
33 views

How to run QGIS plugin from python script

I would like to access external QGIS plugins through a python script. I have been able to access the built in QGIS processing and vector toolbox, but have been unsuccessful with external plugins such ...
3
votes
1answer
69 views

Issue with r.watershed run by QGIS-Python-processing.runalg

I would like to extract flow accumulation and flow direction layers from a DEM calling the grass r.watershed module from a QGIS-python script using the processing class. I obtain just an empty map, ...
2
votes
1answer
128 views

QGIS corrupted plugins upon reinstallation

I had various bugs in my GIS softwares (QGIS, ArcGIS) after uninstalling PyCharm from my computer (time limited school license). For a school assignment we had to change the PythonPATH and PythonHOME ...
2
votes
0answers
26 views

QGIS 2.12 Edit rendering styles for outputs not listing all outputs

I have built a model in QGIS 2.12 and have been using the Edit rendering styles for outputs to set the styles for the models output data. But I have come across an issue. When I am configuring a ...