Python bindings for QGIS.

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QGIS Python API: SAGA difference algorithm does not split parts

I am using the QGIS Python API in an external script (platform: ubuntu). Everything works as expected. But when I am using the SAGA difference algorithm within the script, there is an issue. The ...
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1answer
52 views

Import error when utilizing QGIS's Python Init function

Based on the answer to Referencing Qt UIs external to plugin with python. I'm trying to utilize the "Layer Properties / Fields / Python Init function" to execute a file (test_file.py) that is located ...
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20 views

'QgsGraph' object does not support indexing

Traceback (most recent call last): File "/home/kasun/.qgis2/python/plugins/floogin/floogin.py", line 246, in findRoutes path=self.astar.astarSearch(graph, start, end) File ...
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1answer
59 views

Referencing Qt UIs external to plugin with python

I'm developing a plugin that sets up a working environment for a user: loading layers (from db), applying styles and several custom designed (Qt) UI files etc. Primary user interaction is in the ...
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1answer
28 views

Errors uploading plugin to QGIS python plugin repository

I'm trying to upload my first plugin to: http://plugins.qgis.org/plugins/add/ I keep getting the following error: There were errors reading plugin package (please check also your plugin's ...
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31 views

Running algorithm from Processing takes much much longer time than doing it from Qgis GUI

I have a road layer with 32000 features, and I want to find all the intersections. when I use processing->SAGA -> convert polygon/line vertices to points, it is all done in less than 5 seconds. ...
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1answer
63 views

How to get the map canvas CRS in EPSG code?

This is probably a simple request but I cannot find a way around it: how can I read from python the map canvas CRS? I know how to set it up: canvas = self.iface.mapCanvas() ...
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1answer
43 views

How to open most recent directory using PyQGIS?

For example, when I add a vector layer, next time that I want to add another layer it opens up where I chose my last layer from. How would one implement this in Python and/or PyQgis? I'm writing a ...
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26 views

How can I use the QGIS api on Jenkins

I have a python script with another script for unit testing. I would like to add it to jenkins to get continuous integration. Since I can't pip install qgis, how am I supposed to get the qgis api ...
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31 views

Determine Transect line to cover area

I'm near certain this is a solved problem, but I haven't been able to find a solution from searches so here's my situation (probably I'm searching the wrong thing)... I need to compute the ...
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21 views

Using QgsSpatialIndex for spatial join

I've written a bit of code to do a simple spatial join in QGIS 2 and 2.2 (points that lie within a buffer to take attribute of the buffer). However, I'd like to employ a QgsSpatialIndex in order to ...
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46 views

QVariant is not defined when using addAttributes

When I try to add a field programmatically with the following code: import os.path from PyQt4 import QtGui, QtCore legend = qgis.utils.iface.legendInterface() allLayers = legend.layers() for i in ...
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16 views

Is it possible to override default QGIS error messages?

From my QGIS plugin I would like to override/replace one of the the default QGIS error message ("The layer layer_url is not a valid layer and can not be added to the map") with my own message. I have ...
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48 views

Accessing CRS info with pyqgis in a standalone application

I'm currently having trouble accessing and defining CRS information in a standalone application. I've read the API documentation and have tried it in the python console in QGIS 2.2.0. The python ...
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41 views

How to pass a layer to a thread in PyQGIS?

In my plugin, a user can select one of the loaded layers from a combobox, and then proceed to do further calculations. These calculations are done in a separate thread, "WorkerThread". My question is ...
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20 views

Call post-execution command manually in QGIS Processing

I wrote myself a Processing Script and it works fine. Now i want to style the outcome (a new raster layer) with a QgsColorRampShader(), but the problem is that Processing adds the output after the ...
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1answer
92 views

“Couldn't load PyQGIS” Error running QGIS on Ubuntu 14.04

I have installed QGis on Ubuntu 14.04 from the QGis stable repository; it went fine with no errors reported. But when I launch QGis I get this huge window with the following message: Couldn't load ...
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31 views

QGIS python plugin: PyQGIS for spatial join

For a QGIS 2.0 and 2.2 Python plugin, I am trying to update one layer's field attribute with another layer's field attribute based on geometry function QgsGeometry.within(). My first layer is a point ...
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1answer
107 views

models from QGIS 2.0.2 to Python scripts?

I want to automate some tools for QGIS 2.0.2 using Python. Previously I have used ArcMap for automating tools and now i want to use QGIS. In ArcMap I used the ModelBuilder, and more specifically the ...
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41 views

PyQGIS: How to color raster layer with existing colorBrewerMap

With pyqgis I have added multiple new raster layers to the legendinterface(). Because i like the ColorBrewer style i want to color some of them with the "Spectral" gradient. How can I do this in ...
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1answer
57 views

PyQGIS: How to send signal if layer is currently in edit mode

I'm looking for a way to send a signal if a layer is in editing mode. I tried editingStarted(), but it wasn't working. I'd like to do something along the lines of the what I have below, but can't find ...
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1answer
47 views

Finding Code in QGIS Select Features Toolset

Can anyone tell me in what directory the pre-installed Python scripts for the QGIS selection tools (i.e., Select by Point, Select by Polygon) are found? I am using on a Windows 7 installation of QGIS ...
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1answer
70 views

How to implement 1:n joins with string attribute concatenation?

I have a question concerning pyQGIS. I'm a QGIS long-time (self-learned) user, but just a pyQGIS newbie. I want to implement 1:n spatial join with attribute concatenation in the table. I have a vector ...
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47 views

order layer in QGIS with pyqgis

I´m new in pyqgis. I´m looking for a code to move one layer in TOC to a specific position. Is it possible? Thanks a lot!
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1answer
102 views

How to use Threads in PyQgis, mainly to keep UI active?

I'm trying to develop a plugin, which does heavy computations and as a result, user interface becomes inactive. I know that I should use threads to keep the UI alive (specifically, I have a progress ...
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1answer
101 views

How can i use python QGis network analysis library to calculate short path based on speed and distance?

I want to calculate and show short path from starting point to an end point in a qgis python plugin. in my research i stopped by an article about QGis network analysis library; ...
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1answer
62 views

How to batch interpolate many shp´s to DEM

Here´s the problem: I have about 40 shapefiles of contourlines (type line) and I need to interpolate them to create DEM's (tiff, or better some grid format). To do so, some batch scripting would be ...
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48 views

error when running a script for clipping a group of rasters on QGIS 2.2 OS X 10.9

I'm trying to clip a group of raster files on QGIS 2.2 (KyngChaos) running on OSX 10.9. When I run the script I get an error related with the location of the files. I'm wondering if this is something ...
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38 views

How to include external libraries with my QGIS plugin?

I'm developing a plugin which makes use of "networkx" library extensively. However, networkx is not part of Python libraries pre-installed in QGIS. Is there a way to include this library with my ...
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44 views

Programmatically selecting features by polygon

Expanding upon this post how could you use QGis to programmatically draw a selection polygon and select features within the polygon? I have been using QgsMapToolEmitPoint(self.canvas), to find and ...
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2answers
103 views

How to calculate distance in meter between QgsPoint objects in PyQgis?

I tried to calculate distance between QgsPoint objects in qgis, i used QgsPoint StartPoint.sqrDist(EndPoint). but i don't find an expected result, i also tried import math ...
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60 views

How to populate a combobox with layers in TOC?

I am developing a plugin, and I want user to select one of the loaded layers from a combobox. I've already coded this much: self.dlg.show() layerlist = [] self.dlg.ui.layerCombo.clear() # ...
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56 views

How can I use pyqgis to automate a series of field calculations?

I've got a shapefile with about 30 fields that I'll need to update from time to time by importing a CSV with new data, joining it to the shapefile, and using the field calculator to carry the new ...
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68 views

How can I get the set of points (cloud) that are a given distance in SpatiaLite?

I have a set of points and need to get the groups of points that are within a distance x. Ie, determining the point clouds that are up to the distance x from each other. Any help would be ...
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1answer
49 views

reproject vector layer with pyqgis with new CRS does not worl

In QGIS I am running a script in th python toolbar to export all visible vector layers to a GEOJSON with this snippet: canvas = qgis.utils.iface.mapCanvas() allLayers = canvas.layers() for i in ...
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51 views

Programmatically modify layer datasource on project save event (QGIS)

I have a QGIS plugin which allows users to add WFS/WMS layers to the map. I would like to be able to scramble the user ID part (token) of the uri when the project is saved/closed and then use my own ...
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64 views

Programmatically change layer position in the table of contents (QGIS)

I am trying move/position a layer to the bottom of the TOC by using addTopLevelItem on all other layers. I unsure how to reference the layers as QTreeWidgetItem's. def bg_bottom_level_item(self): ...
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29 views

can not delete file after using runalg function

I my plugin I use the runalg function: processing.runalg("qgis:clip",filepath + "/temp2.shp", Layer, filepath + '/' + layerName) vlayer = QgsVectorLayer(filepath + '/' + layerName + '.shp',layerName, ...
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103 views

Save as .csv with coordinates in both QGIS 2.2 and PyqGIS

These questions have been asked before, but since they are not answered I will try to pick up the ends here. 1) First, as stated here: QGIS 2.2 saving layer as CSV with GEOMETRY=AS_WKT not working ...
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1answer
55 views

Run ftools multiparts to singleparts from PYQGIS

Is it possible to run the multiparts to singleparts function from the console with the processing_runalg function? Or is there another way?
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2answers
107 views

How to copy attribute values of fields in selected features of one layer to another Qgis programmatically?

I am trying to get the values of attributes of the selected features of a layer field by field and copy to another layer that I created in qgis with pyqgis. Is here a example for this. Every example ...
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1answer
60 views

pyqgis: AttributeError: 'QgsRasterLayer' object has no attribute 'drawingStyle'

qgis gurus. I have a question about pyqgis and hopefully I can get some advise here. I am following http://www.qgis.org/en/docs/pyqgis_developer_cookbook/intro.html. In python console after a raster ...
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124 views

Help with scripts for processing raster files with the raster calculator in QGIS

I am trying to process some raster files using python scripts in Qgis 2.20, and I have been having trouble finding any documentation on using raster calculator in scripts being run in the processing ...
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1answer
114 views

How to add the attributes of selected features to my new layer in pyqgis

I am trying to create a layer from the selected points coordinates. I am drawing a circle to the coordinate of selected points. I also need to add initial attributes of my selected features to my new ...
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43 views

Multiparts and Multigeometries: checking for multigeometries with PyQGIS?

I have been working with PyQGIS and writing a small script to check whether the layers I have in the MapCanvas have geometries of type "MultiXX" because I want to run the "Multipart to Singleparts" ...
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1answer
91 views

QGis: scripting the map rendering (multiple similar maps from one shapefile)

I would like to ask for advice on creating a Python script that will provide the opportunity to render a plenty of similar maps (with the same extent, projection, layout, color scheme and composition, ...
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42 views

insertVertex giving false in pyQGIS

I have this code from my plugin which work in Qgis 1.8 and I am trying to make it work in 2.0. I want to insert a coordinate x and y into a polyline after the last entry. points = geom.asPolyline() ...
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14 views

Is there an equivalent of QgsMapToolIdentify in QGIS 1.8?

I'm using quantum gis 1.8 Lisbon, and I need to select a point that is on the map by mouse, to know their attributes. But I can not use the QgsMapToolIdentify function, that would show me another ...
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1answer
15 views

QgsMapToolIdentify(self.canvas)

I am creating a plugin in qgis 1.8.0 and need to get a variable that is saved in the point table. I was thinking about using QgsMapToolIdentify (self.canvas) function, but it gives me error ...
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14 views

Query from plugin that shows result on Map and in Attribute Table

I'd like to create a plugin that performs a static (no user input required) query that, based on a condition, selects all the features on the map and displays these in the attribute table. I have the ...