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With the online material for qgis comes a training manual. It describes how to create forms for vector data. … The most extensive way is to use the QtDesigner, the form itself is stored as an XML-File, which QGIS can use. …

I don't know if this is the way it's ment to be by the autors of the QGIS-API, but in addition to that, the python-API is directly derived from the C++-API, where other naming conventions exist, which … then collide with python and QGIS-Terms. …

This solution uses the Advanced Python field calculator in QGIS 2.18 described here and the function signed_area (i copied it from shapely source code) In the dialog we choose the Input layer first and … The result can be saved to a temporary layer and shows up in QGIS after calculation. An disadvantage may be, the a totally new layer is created, instead of just a new field is created. …

With qgis3 you'll need a different environment: call "C:\OSGEO4W64"\bin\o4w_env.bat call "C:\OSGEO4W64"\apps\grass\grass78\etc\env.bat call qt5_env.bat call py3_env.bat path %OSGEO4W_ROOT%\apps\qgis … =%OSGEO4W_ROOT%\apps\qgis\qtplugins;%OSGEO4W_ROOT%\apps\qt5\plugins set PYTHONPATH=%OSGEO4W_ROOT%\apps\qgis\python;%PYTHONPATH% Didn't test with PyCharm, but the new environment should be the same for …

Projection is flattening the world into a plane, which leads to distortions of angles, distances and area. So be carefull what projection you use. WGS84 is a geographical coordinate systems, its meas …

DB-Manager is a buildin-plugin with extended functionality for qgis and gives you the possibility to use GeoPackages in QGIS 2.18. …

There is an start option for QGIS called configpath. You can change it by editing the batch file in the bin directory, which calls qgis. … The last line should look like this: start "QGIS" /B "%OSGEO4W_ROOT%"\bin\qgis-ltr-bin.exe --configpath %HOME%\.qgis2 %* If you don't have write access to the directory (normally C:\OSGeo4W\bin) you …

QGIS does only execute core python plugins from this folder and these plugins can't be extended. Try to store a plugin there, it will not be touched by qgis. … consists of a folder whith file init.py, a function named classFactory and more, described in the pyqgis developer cookbook At least there is a chance to have a "system wide startup.py" by opening a QGIS-Ticket …

Here is a way to sum up the values with a for-loop: lyr = iface.activeLayer() total = 0 for feat in lyr.getFeatures(): total += feat.geometry().length() print(total)

The base of the voronoi tessalation is a triangulation between the points. The edges of this triangulation are cut on half distance between two points. This is the position where the edge of the tessa …

Inside the following example i assume to have a layer loaded inside qgis containing line string features and two fields named "from" and "to" which store the elevetion values for the first and the last …

elephant head) by clicking New and fill the form to connect (mainly host, port and user) and close the window Go to menu mentioned by Fjellrev and open the SQL-Window To show your query as a layer in qgis …

To do that, close QGIS, make a copy of that db-file (if something goes wrong...), and open qgis.db in a sqlite-database sql-monitor, like spatialite-gui or sqlitebrowser. … Make sure to disconnect your sql-monitor from the database (close it) and start qgis again. …

Second, I think there are tools in grass, callable from qgis, to make a depressionless dem, like the r.fill.dir tool. …

If the problem is to load a plugin inside qgis python console, you may check this code: import qgsAffine # or another plugin modul plugin = qgsAffine.classFactory(iface) # standard interface for register … a plugin in qgis plugin.initGui() # build the gui of the plugin plugin.run() # open the plugin (show it's dialog window) Here i use the plugin qgsAffine to demontrate the interface between QGIS and …