Python bindings for QGIS.

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Setting the extent for a QGIS map using python

I am writing a stand-alone application in Python/QGIS that simply creates maps. I want to load vector/raster layers, set symbology, set extent At the moment, that is all! Currently I am just using ...
4
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1answer
273 views

How to auto-start a pyQGIS thread?

having build some (two) minor plugins, it's now time for me to link a few (perl-) applications to qgis. As there is no perl-interface in qgis I thought the best way to link both worlds together is a ...
4
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1answer
409 views

How change border line to no pen with python console?

From Python console I load a shapefile with qgis.utils.iface.addVectorLayer. How I can remove border lines (change to no pen) in the active layer?
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2answers
420 views

How to iterate over selected layers?

In QGis by pressing shift or ctrl keys a user can select multiple layers in toc. How can a python script iterate over selected layers? I'd expect a iface.selectedLayers() but I can find only ...
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1answer
766 views

How to Create a raster layer from a numpy array using pyqgis?

I am working on a plugin for Qgis to calculate spatial Kernel density maps. I have all the calculations working, all I am missing is a way to turn a Numpy Array, with density values into a multiband ...
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1answer
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QGIS: How to load feature (.qml) styles from python? [duplicate]

Possible Duplicate: How to style a layer from console? I'm trying to set the styles for a vector layer by loading the .qml file in the python console. The qml-style file contains all ...
4
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1answer
719 views

How to load a postgres view using pyQgis?

Under Qgis 1.8 on Windows 7 I have this problem with my pyArchInit plugin: I need to load on the map canvas my geometries from a postgis layer. Till the 1.7.4 version I use the method explained on the ...
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1answer
404 views

How to move Layer to back?

from my Plugin I've loaded a rasterlayer using the following code: fileName = "/path/to/raster/file.tif" fileInfo = QFileInfo(fileName) baseName = fileInfo.baseName() rlayer = ...
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1answer
70 views

How can I create a QgsRubberBand with holes?

I tried to create a QgsRubberBand object with holes, but failed: rb = QgsRubberBand(iface.mapCanvas(),True) geom = QgsGeometry.fromWkt("POLYGON((0 0,4 0,4 3,0 3,0 0),(1 1,3 1,3 2,1 2,1 1))") ...
4
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1answer
138 views

Access ESRI .GDB in PyQGIS

I can access ESRI .GDB data using OSGeo's OGR. The following code gives feature class names embedded in .GDB... from osgeo import ogr driver = ogr.GetDriverByName("FileGDB") data = ...
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1answer
244 views

Why are my calls to SAGA routines in QGIS not working cross platform?

The ability to write and run cross platform scripts for QGIS using python is OUTSTANDING! However, when I try to run the SAGA:MERGESHAPESLAYERS algorithm from a python script it works fine in windows ...
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2answers
258 views

Is there a function to select a region of a map for further processing with Python?

I would like to select a map's region in QGIS for further processing with python console. Ideally I would like to select the region with a mouse drag (like Gimp crop function) and then e.g. analyze ...
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1answer
341 views

Personal shell launcher for PyQGIS

I have changed a shell launcher found at http://inasafe.linfiniti.com/html/id/developer-docs/platform_windows.html as to fit my wish: setting the system environment variables to be able to use PyQGIS ...
4
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1answer
271 views

Can I add entries to the layerlist context menu?

I am implementing a python based plugin for use with QGIS 1.8. Most of it's user interface is contained within a QDockWidget but there are some layer specific controls I would like to append to the ...
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155 views

Efficiently generate Voronoi layers in qgis via Python

The following python commands both appear to function when called in qgis 2.6 to generate Voronoi diagrams: processing.runalg("qgis:voronoipolygons", pointLayer, 1, None) ...
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177 views

Performing buffering and intersection with script in PyQGIS

I wrote a script that performs the intersection of two layers: The first Layer -> layer1, represents the rivers The second Layer -> layer2, represents a set of circular dots distributed in a ...
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0answers
65 views

Using QGIS plugins from Python [duplicate]

Is there a simple way to automate calls to QGIS plugins from a QGIS Python script? Either from console or a plugin? I am ideally looking for a way to specify input/output parameters and bypass GUI. ...
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0answers
105 views

Is there a way to run the spatial query plugin from QGIS python console? [duplicate]

I want to get all contiguous polygons for every county. In QGIS I can do this manually with a Spatial Query, but for a large data set this result impractical. Is there a way to run the spatial query ...
3
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2answers
209 views

Using PyQGIS, ArcPy, NumPy, SciPy Together in Windows Command Prompt

I ran across this slight issue when I was looking to access python installations from ArcGIS, QGIS, Anaconda (cited because SciPy & NumPy come with it), and version 2.7 vs 3. Sometimes, I find it ...
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2answers
1k views

How to read the attribute values using PyQGIS?

What is the way to get the information contained in the attribute table, say in column 2, row 2 using pyQgis?
3
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2answers
1k views

Programmatically load composer from template and generate atlas using pyQgis

I Am trying to build a plugin to load a print composer from file, generate an atlas and export to image. So far I have been successful in loading the template and exporting it to image. I have been ...
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1answer
1k views

How to evaluate raster calculator expressions from the console?

How can I execute from the console an expression that should be used with the raster calculator? I'm searching for something like this: qgis.someRasterCalcClass.evaluate("boh@1 + boh@2", ...
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5answers
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Is there any simple integration for counting points in polygon using python qgis?

Is there any simple integration for calculating count of points in polygon using QGIS-Python integration? In other words, are there any pre-defined functions for points in polygon of QGIS using ...
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2answers
328 views

How to delete column/field in PyQGIS?

How to remove or delete column fields in a shape file using python?
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2answers
2k views

Problem loading vector layer (pyQGIS)

I've installed the qgis on ubuntu 12.04 following the instructions on http://hub.qgis.org/projects/quantum-gis/wiki/Download. I am trying to test the Python API and try to do the follwoing from ...
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2answers
143 views

How to create multiple QGIS layers from multiple text files?

I have a few hundred txt files (each representing a line of a river bed profile) that I need to load as (point-) layers in QGIS. Partial example: 4504764.8331;5374251.3024;397.8871;2 ...
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2answers
93 views

QGIS (2.4) keeps caching old Python code

I'm fiddling around with a piece of python code to use with form validation. It works fine, but the real problem is that QGIS refuses to acknowledge the changes I make in the script. Here's what I ...
3
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1answer
703 views

How to delete selected features in Qgis using Python

I have a shape file with only one field DN. I would like to delete all features which does not have specific value of the field. Let say the DN can be 1,2 or 3. So far I was able to find out how to ...
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3answers
1k views

How to add QGIS Python API Intellisense support in Aptana Studio3/Pydev

I'm developing QGIS plugins using PyDev in Aptana Studio 3 and I would like to know if it's possible to make it aware of the QGIS API and add some "intellisense" functionnalities when programming. For ...
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2answers
292 views

How to write an equivalent to MapBasic's CreateLine in pyQGIS?

I know this kind of question has been asked, in part, before - specifically: Seeing QGIS Python Commands and: How is object created as line using createline stored in .tab file? but this is a specific ...
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1answer
373 views

How to begin with tool development for GRASS gis or QGIS GRASS

I wanted to begin with customized tool development in Grass GIS or QGIS grass. How should i begin in to develop the tool. I search a lot in google search engine for begin with tool development in ...
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1answer
957 views

Get extents of vector shape features in python

i am just wondering if it is possible to iterate through vector features and return the extent per feature without clipping the vector shape? The code looks like this and comes from the ...
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1answer
2k views

How to use gdal_contour in QGIS Python console?

Is there a way to use the gdal_contour utility with-in the python console of qgis ? Thank you
3
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2answers
207 views

Azimuthal orthographic projection QGIS2.6

I'm trying to create a globe view in QGIS2.6 with an Azimuthal Orthographic projection using NaturalEarth's 110m countries dataset. I'm following Hamish Campbell's blog post instructions that have ...
3
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3answers
215 views

Drawing some points in QGIS 2.4 using Python

I'm new to PyQGIS so here goes: Give a new QGIS project, how can we draw some Points on the map? I tried the following but nothing showed up. Should they be placed in a Vector layer before they can ...
3
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2answers
121 views

Is there function to know raster's size (KB) with python?

I am doing a script with python. There I have many raster in canvas (qgis) which I would like to know size in MB. I am searching function in python that give me this result. Anyone can help me? Thank ...
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2answers
240 views

How to remove/disable a toolbar via python?

How do I remove or disable a toolbar e.g., Raster, programmatically using Python?
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1answer
467 views

Got Null values when updating attributes with PyQgis

I'm trying to create and update a field and ,for now, just change it's value to 2. Here is my code: layer = qgis.utils.iface.activeLayer() index = layer.fieldNameIndex("P") # if index == -1: # ...
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1answer
284 views

How to apply a color gradient to a shapefile from QGIS console?

Anyone knows how to do a color gradient from the console to a shape file in Qgis (orin Python)? Like the image below.
3
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1answer
303 views

How do I access QGIS program settings programmatically?

I am trying to temporarily enable the option in QGIS using PyQt4 to suppress the attribute dialog popup after a feature is added. I found an example in the cookbook but it doesn't indicate how to get ...
3
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1answer
1k views

How to generate a grid programmatically in Python without GUI?

Is there a QGIS Python binding for generating a grid programmatically without using the GUI?
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3answers
2k views

QGIS 2 Python error on Mac OSX

Have just installed newly released QGIS 2.0. I installed the gdal package available at the official kyngchaos site. It seems to run ok, but when the program loads up I get a lengthy error message ...
3
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2answers
150 views

How to avoid the CRS Dialog when creating a vector layer memory?

I am trying to create a vector memory in a plugin. Basing on some examples,I was able to create a memory vector layer and to add it in QGis with : QgsMapLayer.instance().addMapLayer(myLayer,True) But ...
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1answer
511 views

How to update data from external table in real time?

I have been trying for a long time to connect a external table data[csv] through Excel (for exmaple) with QGis with the objective to each time i change any data in table(for example data location - ...
3
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2answers
212 views

How to load a raster layer using PyQGIS?

I need to load a raster file from the provided file path. I wish to use it further in the Raster Calculator. I wrote a function which converts string (I assume it is a file path) to a raster object. ...
3
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1answer
293 views

Select by location in Python

I have a polygon layer and a point layer (with coordinates for each point). The polygon layer got created using the MMQGIS PlugIn (Hexagonal Polygons). I want to select all the points inside each ...
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2answers
261 views

Using folder wildcards to copy files with Python

I would like to copy the data of one specific shapefile from a specific folder ("Grid") to a number of folders containing the name "Country". The country shapefiles would keep their original name. ...
3
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1answer
128 views

How to change the edit widget for fields in a layer with PyQGIS?

Is possible change the edit widget with PyQGIS? I have made an extension that loads a PostGIS layer and I want to edit the date fields with the date widget by default without any change in the ...
3
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1answer
91 views

How to import fromUtf8 in QGIS?

# Declare instance attributes self.actions = [] self.menu = self.tr(u'&City_searcher_plugin') # TODO: We are going to let the user set this up in a future iteration self.toolbar = ...
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1answer
165 views

How to show Python console at QGIS program start

I wonder if there is a way to open the Python console of QGIS 2.6 directly at program launch. There is a possibility to set a shortcut for the Python console, but I can't find such an option for the ...