Python bindings for QGIS.

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How to solve problem of non-ascii character on a zipfile on a plugin?

I'm making a plugin that needs extract files from a zipfile before processes them. For this I'm using zipfile lib. The ZIP file contains filenames with non-ascii chars. If I run this code on a "QGIS ...
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1answer
166 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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2answers
87 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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28 views

How to ceate new vector layers / save output in QGIS scripting?

I need to create a script in QGIS which stores outputs. In this case, official documentation didn't help to me. When I use geoprocessing (processing.runalg()) for vector layers. In some cases, output ...
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1answer
21 views

How to update raster color ramp with new min/max values using PyQGIS?

I'm trying to update a single band psuedo color renderer with new min/max values from the python console. All the code samples i have been able to find deal with constructing a renderer from scratch, ...
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9 views

Add save/commit button to custom feature from

I would like to add a save/commit button to a custom QGIS feature from. This is very helpful when there is a linked table dispayed on the same form - the link will work only once the main table has ...
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16 views

How to run the QGIS viewshed plugin from the console?

I want to run the viewshed plugin from the console/ in a script in QGIS. Do you know if this is possible?
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1answer
28 views

How to write a vector layer as tab delimited txt file using PyQGIS?

I'm using the following QGIS 2.8 Python code to save results to a txt file QgsVectorFileWriter.writeAsVectorFormat(inputLayer, "D:/dstest/my_csv", "CP1250", None, "CSV",True) I would like to be ...
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1answer
135 views

How to select and zoom in features from a QGIS Python Plugin

I'm very new to Python. I'm trying to find a way to select and zoom to the features from a QGIS layer. I've created a plugin and built a custom form. I have 3 values from the form which I need to ...
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29 views

Collecting data [on hold]

I'm using qgis, i'd like to know if there's an app that i can install on a tablet for collecting data, and after by connecting the tablet on my computer in order to upload the data ?
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9 views

AddFeatures returned values …?

i try to add Features in a polygon vector layer. i'm using for example the following lines : fet.setGeometry(ft_com.geometry()) bool=pro.addFeatures([fet]) bool returns me True (i see the added ...
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21 views

Automated Viewshed in QGIS

I want to create a workflow with a QGIS script where I need a viewshed tool. There is a really cool viewshed plugin. Unfortunately I am not able to access it in the QGIS console. I also found out that ...
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42 views

How to create a Shapefile of a subset of input features in PyQGIS?

I'm having some trouble applying my Python skills to develop some scripts in PyQGIS. For me it's far simpler to write it in ArcPy, but then again I wouldn't get that much satisfaction after finishing ...
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15 views

pyqgis, features geometry type changes to unknown after copying to anoter layer

Im copying a subset of features from a shapefile based QgsVectorLayer (polyline type shapefile) to a memory based QgsVectorLayer('LineString', layername ,'memory'): ...
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28 views

Identifying Left and Right Mouse Button Clicks in PyQgis application

I am relatively new to PyQt. I am trying create a custom plugin for Qgis which enables the user to select some features by drawing polygon on the canvas using mouse clicks and then performs ...
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7 views

Range problem in QDoublespinbox for different projections of data in QtDesigner\python

I have two QDoubleSpinboxes that updates the value of latitude and longitude of a point respectively. The data is in the CRS "EPSG:32643 - WGS 84 / UTM zone 43N" I had also set range of the ...
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1answer
29 views

QGIS Python Scripting permission denied

I've just started a Python Scripting tutorial on QGIS. The problem arrives right at the end, when I have to use this script: output_file = open('c:/Users/Ujaval/Desktop/airports.txt', 'w') for f in ...
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3answers
56 views

Is there any way to freeze the layer names in the TOC?

I would like to freeze the names of layers in TOC. Is there any way to do this via QGIS config or PyQGIS? I´m using QGIS Wien.
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2answers
74 views

Create a script to add delimited text layer in QGIS

I'm trying to use QgsVectorLayer() function to add delimited text layer in QGIS. So I have a txt file (T_1999_1_2.txt) in path: "D:\PATRICIA\DOCUMENTOS\ESTACOES METEOROLOGICAS\DADOS METEOROLOGICOS\T" ...
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2answers
480 views

How to add a layer group using pyQGIS?

Good morning, I would like to know how I can create a new group in the layer manager using python code, someone could help me?
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1answer
137 views

How to print 2 maps in the same PDF page using PyQGIS?

I am trying to generate a one-page PDF document containing the following items: 1) On the left half, a full state map (say, New York State). 2) On the top right quadrant, a map that zooms in to one ...
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1answer
64 views

Logging layers openings?

i would like to log every layers openings in PyQGIS, regardless of the opened project. Is there a way to achieve that ? Where should be the Python code be located in that case ? Thanks for your help ! ...
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1answer
30 views

fTool in pyqgis: Is it possible?

I am doing a work which I need to sample random points for many layers (classification of land use). Then, I'm trying to do a loop with my several layers and applied a functions of random pointos. I ...
2
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1answer
475 views

Failed load delimited layer in QGIS python console

I'm trying to follow the map rendering section from the pyqgis cookbook. I am able render shape file using qgs vector layer, however getting error prompt while loading delimited text file through qgs ...
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2answers
223 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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19 views

How to remove a QgsMapCanvasLayer from QgsMapCanvas with PyQGIS || C++?

I try to find a way to remove a QgsMapCanvasLayer from the QgsMapCanvas. At the moment I only can delete the MapLayer from the QgsMapLayerRegistry with: ...
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2answers
32 views

How to add an image to canvas?

I am trying to make a QGIS plugin using Python. Right now I need way add an image to canvas but I don't want that image to be a new layer in qgis project. Is there a way to do it? Now I have: ...
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25 views

Adding Oracle Spatial Layer using Python Bindings of QGIS

I want to load a layer from my Oracle Spatial Database using the Python bindings of QGIS. I have tried loading the layer by creating the uri as shown in some previous posts. I am using the python ...
3
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1answer
1k views

legend groups and layer position/order qgis 1.8

I'm tring to programmatically create layer sequence also using groups. Simple python code: layer = QgsVectorLayer("004cp000.shp", "004cp000", "ogr") QgsMapLayerRegistry.instance().addMapLayer(layer) ...
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1answer
96 views

How to create and remove multiple QgsRubberBands in PyQGIS?

Currently the following code-snip works great to highlight a shape based on the 'feature' and 'layer' variables: self.rubberHighlight = QgsRubberBand(self.iface.mapCanvas(),QGis.Polygon) ...
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1answer
50 views

How to display a picture in QGIS custom form?

I'd like to integrate an UI file as a form in QGIS 2.8. The UI file is created in QT Designer. One of the attributes in the attribute table is a filepath to an image. I'd like to display the picture ...
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1answer
193 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 ...
2
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1answer
19 views

Unable to compile using make test in Linux

While trying to compile my test plugin I encounter this error, for the moment I can't figure out why, last week I had some issues on windows but eventually solved them via OSGeo Shell but this time ...
2
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1answer
204 views

How to load a *.qgs file in a C++ QGIS standalone app?

I'm using QGIS-2.4.0 API to develop a standalone app by C++. I saved a test.qgs file in QGIS Desktop software, in the project, there was one layer and it was visible. Then I loaded the test.qgs ...
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2answers
853 views

How to debug 'Layer is not valid error' from Python plugin?

I'm trying to understand what goes wrong with a QGIS python plugin. Basically I'm trying to render a series of POINT. The query works fine, at least giving it by hand from inside PostGIS DB: "SELECT ...
3
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1answer
532 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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2answers
89 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. ...
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1answer
41 views

pyscripter : add a legend to my vector layer

I work on PyScripter, i managed to display a vector layer from Postgresql with a symbology. But I have a difficulty to display a legend. def main(): def init(): # appel de l'application et ...
3
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1answer
36 views

Getting co-ordinates of current map canvas using PyQGIS?

I'm trying get the extents of the current map canvas. CRS is 22700 BNG. My code: canvas = iface.mapCanvas() print canvas vLayer = iface.activeLayer() extents = vLayer.extent() print extents ...
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1answer
65 views

How to create a text file containing layer names in QGIS?

My QGIS ToC contains layer groups and some layers that do not belong to any group. I would like to create a text file containing the name of those layers that do not belong to any group. Is there an ...
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2answers
67 views

QGIS and Google Streetview?

Is there a way to open an (embedded or not in QGIS...) window containing a Google Streetview view at given coordinates using PyQGIS?
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2answers
2k views

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 ...
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0answers
21 views

Setting up PyCharm CE 4 to work with PyQGIS library in Mac OS

I am trying to set up pycharm to work with pyQgis library but with not success till now. I am using PyCharm CE v4 and QGIS version 2.8 I have tried to implemnte the instructions of several posts like ...
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0answers
29 views

How to add diagrams to a layer in a PyQGIS standalone application?

In my standalone application, I show different layers based on queries into a canvas. Now I want to add a layer with charts over by the values of an attribute. Is it possible in a standalone ...
2
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0answers
43 views

Is it possible to use memory layers in QGIS processing algorithms?

I am building a QGIS plugin that connects to a MySQL database in the local network, and then adds a subset of one of the tables to an in-memory layer; the subset is based on data currency (only taking ...
2
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1answer
66 views

Why does this Python script only work once on QGIS?

I have a Python script to change the color of some specific features (lines) using categories in a vector layer. When I import the script in the console, the first time through the console it works ...
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1answer
98 views

Can we avoid using SIP library when writing standalone QGIS python script

I wanted to write a small custom python script using QGIS functionality. So I started with the QGIS documentation on the custom application section. After having some troubles with the import ...
2
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1answer
30 views

Multiple ComposerMap items not rendering properly Pyqgis

I am currently trying to put together compositions using inputs from two different map canvases. One is from a canvas built and controlled via a plugin, the other is the the main QGIS canvas (accessed ...
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2answers
176 views

“ImportError: no module named qgis.core” in standalone app

I am developing a standalone app (in Windows) using libraries from QGIS. When I run the script in cmd, I get the ImportError: no module named qgis.core. I read in several posts that I need to ...
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1answer
79 views

PyQGIS - load PostGIS layer as editable

I can load a PostGIS layer on QGIS' map canvas but "Toggle Editing" button comes "inactive". How can I load vector layer as editable? The code given below loads PostGIS layer on map canvas & ...