Python bindings for QuantumGIS (QGIS)
9
votes
4answers
469 views
How to buffer in pyQGIS?
I'm looking for some examples to do simple python scripts in QGIS. How would I do a buffer analysis on a dataset?
I can't seem to find much in the manual and QGIS python that quite matches the Esri ...
7
votes
1answer
130 views
Is it possible to show our custom message in QGIS Status bar using python?
Is there any way to show our custom message in Qgis Status bar using python? Just like in arcgis "IApplication.statusbar.message(0) = "Please wait..."
like that is there any option to show ...
7
votes
1answer
162 views
How to draw perpendicular lines in QGIS?
I have a situation like this:
What I need to do is to connect each point to every line that is at most, let's say 200 m, away from the point. In other words, I need to draw a perpendicular line ...
7
votes
2answers
99 views
How do you obtain the execution times of processes in qgis?
I am working on QGIS. I need to determine how much time QGIS needed to finish a specific task. I have been unable to get execution times for the processes. What is the proper way to get processing ...
7
votes
4answers
621 views
How to run sextante algorithms outside of qgis python console?
I'm kind of stuck trying to figure out the way to run sextante from a standalone python from OSGeo4W distribution. The reason I want to do this is that I got tired entering parameters in the dialog ...
7
votes
1answer
106 views
Unable to load .gpx file from Python Console
I'm trying to create a plugin which will extract the gpx files and load them onto the active layer window in QGIS. While I'm able to load it using the QGIS GUI from Layer>New Vector Layer, I'm not ...
6
votes
1answer
99 views
How to save python session in QGIS?
After running a lot of scripts in QGIS' python console, I have more than 10 dictionaries and lists, and I need these for further analysis. Is there a way to save python session, with all these ...
6
votes
1answer
324 views
How to add a toolbar via python?
Through tutorials I learned how to add a toolbutton to the plugins-toolbar via python. Now I wonder how to add a complete toolbar with toolbarbuttons via python.
Can anybody give some example-code?
...
6
votes
1answer
122 views
How to address the new “Task-Completed” QgsMessageBar in Python?
I am really amazed what huge steps the QGIS development has taken in the last months. The new iconset, the improved Print composer and many more changes to be seen in QGIS 2.0 are really awesome!
...
6
votes
1answer
442 views
Is there a way to access QGIS plugins in Python?
Is there a way to access QGIS plugins in Python? I'd like to write a script to do some geoprocessing, and I'd like to use the clip, regular points and convex hull tools in fTools, as well as the Road ...
6
votes
1answer
517 views
When iterating over a vector layer with pyqgis, how do I check whether a feature is selected?
While iterating over a vector layer using the following code (summerized from the example in the pyqgis cookbook), is there a way to check whether a feature is selected?
provider = ...
6
votes
1answer
911 views
How to create a new empty vector layer programmatically?
I am new to python and QGIS. I have looked at a few tutorials of python scripts for QGIS. All of them create new vector and raster layers with some existing data source. eg. shapefile or geotiff or ...
5
votes
2answers
312 views
How do I use QGIS python console to iterate through simple layer queries and png outputs?
I'm really new to QGIS coding and I'm having a hard time finding (especially) the api classes/functions to carry out actions of the Query Builder window.
I'm basically trying to do this:
Iterate ...
5
votes
1answer
321 views
How do I allow users to select features with the mouse?
I am using PyQGis API to create a custom application.
How do I allow users to select features with the mouse? Is there a mapTool for this? Surely with a product as powerful as QGis there must be.
...
5
votes
1answer
643 views
Why can't I import my script from the python console?
i am working with the qgis python console.
I usually store all my python scripts into ~/Scripts/python
I do have set the PYTHONPATH to ~/Scripts/python in my .bashrc
However, I can not manage to ...
5
votes
1answer
154 views
How to transform a selected multipart feature into singlepart features while editing in QGIS?
There are several questions and respective answers for how to make a multipart features Layer into a singlepart features one using QGIS:
How to break a single polygon into multiple polys?
How to ...
5
votes
1answer
250 views
How to get pixel size/cell size of raster layer?
After much searching, I've still not been able to figure out how to perform what seems like a simple function: I'd like to get the pixel size/cell size of a raster layer using PyQgis. Is there any ...
5
votes
1answer
158 views
How to call GRASS modules in pyQGIS?
I wish to use a Grass module (v.to.db) in QGis, without the grass toolbox.
I tried with the Python console, but to no avail :
Using Sextante plugin but obviously it didn't know all the grass ...
4
votes
4answers
113 views
How to display a “Save As” dialog for raster files?
I'm writing a QGIS plugin in python. I need to show a "Save as" dialog window in order to allow the user to select the path of the output raster file. Do I need to create a QFileDialog and manually ...
4
votes
1answer
97 views
Speed of editing attributes in QGIS from a Python plugin
I'm trying to edit the value of an attribute for each feature in a layer using a QGIS Python plugin. I've found that doing this outside of editing mode is much slower than while editing (even ...
4
votes
1answer
435 views
How can I add OpenLayers layer from the python console?
I am new to the python console.
How can I add a layer from the OpenLayers plugin from the python console?
Thank you
4
votes
1answer
175 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 ...
4
votes
1answer
128 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
votes
1answer
83 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?
4
votes
1answer
265 views
How do I maintain a resposive GUI using QThread with PyQGIS
I have been developing some batch processing tools as python plugins for QGIS 1.8.
I have found that while my tools are running the GUI becomes non-responsive.
The general wisdom is that the work ...
4
votes
1answer
55 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 ...
4
votes
2answers
151 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 ...
4
votes
0answers
90 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
votes
2answers
199 views
How to automatically reloaded raster layer if source is changed in QGIS?
How to automatically reloaded raster layer if source is changed? (The path is the same but inside source file are changes)
I use:
qgis.utils.iface.mapCanvas().refresh()
but layer not refresh.
#
...
3
votes
1answer
395 views
Get a pixel value
How can i do this operation:
I want to get a pixel value fro the satellite image (Landat, GeoTIFF, 7 bands) using qgis-python.
What operators should i use? (for example in qgis's Python Console)
...
3
votes
1answer
216 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 ...
3
votes
1answer
400 views
How can i obtain the data of one selected feature in QGIS using python?
I have a problem / question regarding python and QGIS. Is it, and yes how, possible to get the data of one selected feature in QGIS using python?
In my example I have a layer which shows some parcels ...
3
votes
1answer
443 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
votes
2answers
167 views
How do I specify the position, style and units of the ScaleBar in pyqgis?
I would like to add a scale bar to my composition using the python console and then export it to a raster image.
I am following the MapRendering tutorial with the "output using map composer " approach
...
3
votes
2answers
90 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 ...
3
votes
1answer
67 views
How to calculate all paired shortest path using PyQGIS?
The code for shortest path analysis with PyQGIS specifies start and end nodes explicitly:
pStart = QgsPoint( -1.37144, 0.543836 )
pStop = QgsPoint( -1.1027, 0.699986 )
...
3
votes
2answers
82 views
Merging polygons at county level to state level
I have a shapefile that represents counties (admin 2) only, but I need to create a state level (admin 1) polygon file (I'm using QGIS). I will need to sum up (or average) the relevant data at each ...
3
votes
1answer
120 views
Can I use QGIS plugins in PyQGIS as a stand alone script without iface?
Can I use a qgis plugin especially (openlayers plugin) in stand alone pyqgis script?
I don't find examples, just code using iface but that cannot used in stand alone script.
3
votes
1answer
308 views
Changing attribute data types using PyQGIS
OK, so I've already asked a question how to access attribute data types when developing plugin for QGIS, using PyQGIS. And one helpful member said i should use pendingFields() method on the current ...
3
votes
1answer
78 views
How to find the nearest line to a point in QGIS? [duplicate]
My question is that given a point and few lines, how should I go about finding the nearest line to the point?
I am aware of How to I find the nearest line to a point?, but that isin ArcGIS and ...
3
votes
1answer
168 views
How to deploy a QGIS Python Standalone Application with minimum installation size?
I am trying to create a Standalone QGis Application using python. I was able to create the nice looking shapeviewer application by following the steps here.
Now I would like to deploy this in ...
3
votes
1answer
132 views
Why are the features in my memory layer not displayed?
I am trying to create a memory layer, I followed the directions from the page below but no points appeared on my map. First I tried typing each line into the python console and I also create a plugin ...
3
votes
2answers
111 views
How can I read the settings for the QgsPaperItem from XML?
I saved a template qpt for the map composer and now I want to read all the settings. I am able to insert the items with composition.addItemsfromXML...
But this doesn't load the settings for the ...
3
votes
1answer
75 views
How can I programatically create and add features to a memory layer in QGIS 1.9?
I had a working plugin in QGIS 1.8 which read data from an MSAccess database and added it to a series of memory layers. There is some processing involved in the interim so I don't think simply using ...
3
votes
1answer
63 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 ...
3
votes
1answer
397 views
How can I Setup Python to recognize QGIS
I want to use QGIS and work with Python out of the console, but I'm having troubles letting the system recognize the paths of some DLLs.
Since I couldn't find a good answer on the web, I wonder if I ...
3
votes
1answer
94 views
Join GPS points obtained from .GPX file in Python Console
Having loaded the .gpx file into a new layer from python console, I'm unable to access the gps points in the attributes table. Essentially, i'm unable to join these points to form a polygon ...
3
votes
1answer
68 views
Button to add a new line in a non-spatial table without opening the table itself using QGIS?
While using QGIS and having loaded a non spatial table (from PostGIS), is it possible to add a new row to its table attributes without having to open the attribute table first as in here Is it ...
3
votes
1answer
102 views
How to display a particular area?
Hy,
I'm developing a plugin in python for Qgis.
I would like the user to select a particular area in a list (let say a country list) and zoom in the map on the corresponding area.
Actually I'm ...
3
votes
1answer
194 views
Creating Selection MapTool in PyQgis Custom Application
I'm developing a custom GIS application using PyQgis API.
How can I let the user select features on the map using Maptools? I would like to replicate the select feature there in Qgis to make the ...
