Any of many techniques in which data is retrieved, stored, classified, manipulated, transmitted and/or reported in such a way as to generate information.

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2
votes
1answer
32 views

QGIS 2.4 graphical modeler add field: error executing algorithm

I have to add more than 20 fields to a lot of shapefiles. I used to do it with the tablemanager plugin. Beside it is time consuming, misstakes can be made. So I want to automate that procedure ...
6
votes
1answer
70 views

Why the order of imports matters in a standalone PyQGIS processing script?

I've come across a weird issue while running standalone PyQGIS processing scripts. The order of imports in the script affects its normal execution. You can reproduce the problem by opening a Python ...
1
vote
0answers
45 views

Problems using the SAGA in processing framework with qgis 2.6.1 (ubuntu) [closed]

I've got problems using saga in the processing framework within qgis 2.6.1 and SAGA 2.1.4 To solve this problem I was obliged to correct the line 352 of the python file ...
2
votes
2answers
126 views

How to use QGIS explode lines with Python

I want to access the explode lines function in Python outside of QGIS from a standalone script. What module do I have to load in order to use it? How can I access processing? from qgis.core import * ...
3
votes
1answer
37 views

Remote Sensing Indices for urban expansion

Apart from NDBI, could you name a few indices for urban expansion? I have done some search on google but haven't found anything that could help me. Perhaps, What I'm interested is also: ...
2
votes
0answers
24 views

why in my processing of qgis not exist the module Catchment area (Parallel)?

I have qgis 2.4.0 chugiak and have install processing but in the box of tools not exist the module catchment area (parallel), how to install this module? thank you !!!!
2
votes
1answer
48 views

Distance to nearest hub output not correct

In QGIS 2.6, I'm working with two point layers: center of the population per census tract and stores that accept food stamps. I'm using "distance to nearest hub" to calculate nearest food stamp outlet ...
1
vote
2answers
39 views

why Input layers do not have the same grid extent in the processing, hydrological analysis?

I'm trying to generate the hydrological analysis using processing and I have already done some terrain processing using the DEM. In this moment, I'm working in he channel network but, when i assign ...
3
votes
1answer
62 views

Getting random values from geometryType() in a standalone PyQGIS script

I am asking this question based on the result I received from this earlier post. The following script only works if I set geometryType() == 3 as that is what is being printed out in the Python console ...
2
votes
1answer
61 views

ImportError: No module named processing

this question may have been discussed before but i was not able to find any answer. I am developing a stand alone python script that will invoke methods from processing module. I am seeing error ...
4
votes
2answers
278 views

How to identify polygon/point shapefiles in python?

I have a script which performs various functions on shapefiles, most of which are polygon-based. However, some shapefiles are point-based and I have to specify where these files are by editing the ...
0
votes
0answers
22 views

saga:slopeaspect curvature

I'm using windows 7 on 64 bit and using Qgis 2.6.0.I'm trying to process some Tifs from the console using the processing toolbox and saga:slopeaspectcurvature. This is pretty much how my code looks ...
0
votes
0answers
29 views

QGIS 2.6 graphical modeller error Mac Osx

After I installed Qgis 2.6 the processing graphical modeler seems not to work correctly. From the toolbox the built in algorythms work correctly, but from the graphical modeler not. From the toolbox ...
2
votes
1answer
43 views

On-The-Fly Processing

what's on-the-fly processing in arcgis? saw this terminology while doing some research on mosaic dataset. Looking for a simple(less-complicated) answer.
1
vote
0answers
21 views

Change Malvinas/Falkands label, in Argentina, South America,

I'd like to know if there any way tu change or hide te label of "Falklands Islands" in south atlantic sea, Southamerica, Argentina, in CartoDB. I know CartoDB works with Open Street View. Thank you
0
votes
0answers
24 views

Warp polygons/lines from distortion grid, or similar

Anyone have any ideas how I might go about warping polygons or line based on point based distortion map? Specifically, let's say I have a (non-regular) point data set. I create a clone of the data ...
3
votes
1answer
137 views

Will core functions in QGIS 2.6 exploit multi-threading?

After reading a recent post about introducing multi-threading to QGIS, I was wondering if QGIS 2.6 will include this when running various processes. I checked online and I could only find that ...
0
votes
0answers
8 views

Can I set processing (sextante) script default output vector data extension?

I am trying to create a tool that converts text data to KML by writing a Processing script. All works great, but I was wondering, if there is a way to set a defaut file extension for output vector ...
1
vote
0answers
66 views

QGIS processing framework SAGA NaturalNeighbor in external Python Script - No Output

I want to build a little script, which generates a NaturalNeighbor grid based on a point Shapefile. The script runs within my PyDev environment without any error messages, but no outputfile is ...
1
vote
2answers
79 views

Turning Polyline with Multiple Segments into One Single Line

Using QGIS Valmiera (MapInfo and other software is also available) Is there a way to convert a polyline with multiple segments into a single line? I.e. by taking the first point and the last point of ...
0
votes
1answer
316 views

QGIS Processing error with SAGA, “output layer could not be open”

QGIS 2.4.0 SAGA GIS 2.0.8 DESCRIPTION ERROR when processing with SAGA. I used the "Shapes to Grid" function. The error given: "Oooops! The following output layers could not be open". This error ...
3
votes
0answers
25 views

Processing for large scale networking animation?

I am looking to create an animation of network connections, something very similar to this: http://vimeo.com/16897839. Let's say I have a huge database (millions of rows), that includes source ...
1
vote
1answer
93 views

Error using 'Join attributes by location' via Python

Trying to run a simple script using qgis:joinbylocation but getting either errors or it's not processing correctly. I don't want to take a summary of the attributes, just the attributes of the first ...
0
votes
1answer
52 views

QGIS processing does not support jpg

I would like to work with the gdal functions provided in the processing toolbox. It is easy to call: import processing processing.alglist() ...
0
votes
1answer
233 views

Using Union on multiple shapefiles to output single result

Using QGIS 2.2 and Python, I would like to use the Union algorithm on multiple shapefiles (contained in a folder TEST) which would then produce single shapefile containing all the data. Currently ...
0
votes
0answers
46 views

time processing

I am computing NDVI for Landsat TM in grass 6.4.3 in raster map calculator, and time processing is many hours and finally tke message is "failed". trying to find a solution I discovered that it ...
0
votes
1answer
69 views

Pywps Timeout long processes

I'm executing a long process WPS of around 180sec, and when it start after 60sec the WPS (response) is abandoned, and the process continue to run until the end (checked on the log file). I tried the ...
1
vote
0answers
68 views

Graphical Modeler to rotate points based on line layer azimuth

I am trying to create a model using the QGIS 2.0 Processing Toolbox graphical model to replicate the process described in this thread: How to horizontally align irregularly shaped point symbol to ...
2
votes
0answers
125 views

Is there a decent algorithm in QGIS Process Modeller to create a grid?

I am using Process Modeller to automate merging several vector layers and then creating a grid to cover the extent of the merged layer. There are functions which already exist which are not listed in ...
0
votes
0answers
35 views

In QGIS Process Modeller, is it possible to automatically run a function on several layers without listing all combinations?

Trying to develop a Model which includes finding any intersections between layers and then merging them all into a single layer. I have 12 layers in total, it's not really efficient to list all the ...
2
votes
1answer
166 views

PyScripter crashes at “import processing”

I set up PyScripter latest version, 2.7) to work with QGIS (2.2, OSGeo4W install) following http://chelahmy.blogspot.ca/2011/02/setting-up-pyscripter-for-quantum-gis.html. It generally works well. I'm ...
1
vote
0answers
87 views

Is the SAGA tool Basic terrain analysis included in Processing?

I can't find the saga tool Basic terrain analysis in the Sextante/processing toolbox. Is this not included or is there a chance to install it?
1
vote
0answers
58 views

How to increase FUSION-LTK lidar processing productivity?

I am processing Lidar data with FUSION-LTK. My study area contains 5 blocks of 1000 las tiles per block. Each block is broken into approximately 4 subblocks of 250 las tiles. I am calculating grid ...
0
votes
0answers
70 views

Using iface.showAttributeTable() on QgsVectorLayer retrieved by getObject()

I'm unsure if i'm properly using the processing.getObject() function. I'm creating a python processing script for QGIS 2.0 and 2.2, but can't seem to get an attribute table to open programmatically. ...
1
vote
1answer
131 views

Processing Script: now gives error in QGIS 2.2

I recently updated to QGIS version 2.2, and am now getting an error when running Processing scripts that worked previously (in version 2.0.1). Uncaught error while executing algorithm Traceback (most ...
0
votes
1answer
71 views

QGIS-Processing GRASS-tools don't work

When I try to use the processing grass tools like r.series I always get the following messege. I deinstalled QGis and reinstalled the program totally fresh without success.
5
votes
2answers
237 views

Raster: mosaic first, or project first?

I have a thousand raster tiles in un-projected decimal degrees from which to build a seamless mosaic in a metres-based coordinate system. The final image will be about 70,000px by 50,000px. Which is ...
3
votes
3answers
162 views

Removing duplicates from large LAS files

Are there any publicly and free (not necessarily open-source) applications that can remove duplicate points from LiDAR clouds? I would like something on the lines of lasduplicate -unique_xyz, which ...
1
vote
2answers
1k views

Qgis - Couldn't load plugin 'processing' - name 'QsciLexerCustom' is not defined - Manjaro

UPDATED I receive the following error when I start Qgis: Couldn't load plugin 'processing' from ['/usr/share/qgis/python', '/home/v/.qgis2/python', '/home/v/.qgis2/python/plugins', ...
1
vote
1answer
65 views

QGIS Grid Division/Grid Product etc. results are wrong projection

I have several raster grids, all 4320 columns, 2160 rows in WGS 84 projection. They are loaded from ESRI ascii files. When I use the Processing Toolbox to carry out arithmetical transformations on the ...
2
votes
3answers
914 views

Using handheld GPS for sub-meter precise positioning

I've heard that we could use two or more handheld GPS to get a better positioning accuracy using post processing techniques. Anybody can tell me the methodology? Also, can we program handheld GPS such ...
0
votes
0answers
44 views

Import processing in qgis 2.0 [duplicate]

I know that this question has already asked but no concrete answer has given!! My environment is Ubuntu 12.04 and I'm using eclipse-pydev as IDE. Thanks in advance for helping me.
0
votes
0answers
158 views

Why does the SAGA raster calculator fail when used in a Processing model?

I have a problem with the modeler and the saga raster calculator. When I'm using the raster caculator without the modeler it works fine. When I'm using the saga raster calculator in my model I always ...
1
vote
0answers
41 views

problem on loading kriging outputs [duplicate]

My problem is the following: everytime i run ordinary kriging or other interpolation techniques i obtain this error message from QGIS Notice that these are the details for SAGA I would like a ...
1
vote
1answer
36 views

Is it possible to include the Map composer in Sextante for QGIS 2.0?

I would like to solve a problem (Species atlas (how to automate to create on page for each species with QGIS)). To solve it by an other way, I would like to know if it is possible to make a sextante ...
4
votes
2answers
480 views

How to load memory output from QGIS processing?

Many processing algorithms have an option to save output as memory. If ran from toolbox, this works fine, because you can tick the "Open output file after running algorithm" box. Looking at the ...
4
votes
1answer
805 views

Using in-memory vector layer with QGIS processing / SEXTANTE

I'm trying to run the qgis:clip algorithm from console, but am getting an error when using an in-memory layer as the overlay parameter. Is this to be expected, or am I doing something wrong? Code: ...
0
votes
1answer
269 views

problem in loading outputs from processing tool (sextante) [duplicate]

hopefully some of you have got an answer to what happens to me when i run (so far) all the processing tools for carrying out raster analyses. This is the type of message i receive from QGIS (2.0.1 ...
2
votes
1answer
177 views

What does the “Standard Distance” output from the spatial point pattern analysis in QGIS 2 represent?

I have a cluster of points and I am using the Spatial point pattern analysis tool from the processing toolbox in QGIS 2. I am having trouble understanding what the "Standard Distance" output is? It ...
2
votes
1answer
118 views

Problems in gdalwarp

I was trying to use gdalwarp inside a qgis 2.0 model via processing but I think that the implementation is not working properly. So I would like to know if anyone has encountered this problem?