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

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45 views

Why does QGIS 2.16 have longer load times than 2.8, especially working with tables?

I was previously running an LTR version of QGIS (2.8.9 I think). I installed 2.16 and found that opening tables takes a very long time. Deleting columns in tables now takes hours as opposed to seconds....
-1
votes
0answers
18 views

laszip batch process in qgis extension lastool

i am using qgis 2.16 in that lastool plugin contains laszip option. please tell how to run batch process in laszip. ill not able to add multiple files at a time in batch process.result came only for ...
4
votes
0answers
75 views
+50

Problem executing vectorgrid (from processing) in a standalone script using QGIS 2.8.6

I have the following piece of code which I execute within QGIS 2.8.6 import processing import ogr restrLayer = QgsVectorLayer("/home/usr/Desktop/trial/EligibleAreas_polygons_filtered.shp", "...
1
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0answers
28 views

How to use Hub distance in a processing model?

I am trying to make line layer (hub distance layer ) between two point layer in QGIS 2.16. It works fine when I make layers step by step but, I want to make MODEL in processing modeler and ...
5
votes
2answers
121 views

QGIS 2.16 Merge lacks folder option

I've installed QGIS 2.16 and have noticed that the Merge (Vector Menu>Data Management) doesn't appear to have a Folder option anymore. This was the option that allowed you to process/merge a complete ...
1
vote
1answer
32 views

Batch processing las files with LASzip from QGIS?

I am using QGIS 2.16 version. I added LAStools plugin and executed batch process, in a way that I have to write each filename in the output field. Is there any automatic process to get outputs with ...
1
vote
2answers
92 views

Problems with Saga integration in QGIS 2.14.4 LTR

I've installed QGIS 2.14.4 LTR (32 bit) on my WIN7 64bit system. But I believe something is wrong with the "Processing" plugin as many of the features were missing from what I've used earlier. My QGIS ...
6
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5answers
523 views

Missing Processing Tools in Vector Menu - QGIS 2.16

I'm missing all the usual processing tools in the Vector menu in QGIS 2.16 (eg vector overlay, analysis, etc). They do appear in the processing toolbox but there's no sign of them in the Vector menu. ...
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0answers
7 views

error message vector histogram 'minidump'

I'm trying to build histograms of elevation data but everytime I run the algorithm I get this message; and then the program closes. I checked the help tab for the wizar and it has this; I had the ...
2
votes
2answers
111 views

How to remove the overlapping part of polygons?

This might be a duplicate but after countless search I couldn't find anything that matches my needs. Sometimes a picture speaks better than words, so here is what I'd like to achieve in Qgis. I guess ...
1
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1answer
30 views

QGIS: Automatic shapefile input for pre-constructed automated workflows

I currently have two models running: Take shapefiles and break them down into separate shapefiles based on their class, and save them in a specific folder; Select the broken-down shapefiles with the ...
1
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0answers
35 views

Is there a faster process to update one column for all features?

I have written a python script in QGIS which estimates the amount of residents for each building polygon by using census block data and building polygons (about 500 000 buildings in an area of about ...
2
votes
1answer
56 views

pyQGIS merging shapefiles

I've been searching the internet for a while now trying to look for a way to merge all the shape files from a directory (a folder) into a single shape file. I found many solutions but none of them ...
1
vote
1answer
30 views

Run processing (GRASS) algorithm as administrator

I am trying to use GRASS algorithms in a plugin of mine, in order to improve the quality of a shapefile containing lines that will be used as a graph later. The first algorithm I want to use is the ...
2
votes
2answers
142 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
35 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
43 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 ...
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0answers
23 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
25 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
63 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
132 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
107 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
59 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
44 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
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1answer
71 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
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0answers
87 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
80 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
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1answer
63 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
17 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". ...
3
votes
1answer
41 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
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0answers
38 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
40 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
139 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
95 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
159 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
57 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
28 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
51 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
51 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
99 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
113 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
31 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
52 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
68 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
102 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
72 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
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0answers
77 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
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0answers
72 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 ...