HichamZouarhi/Weighted-Voronoi-PyQGIS

an implementation of weighted voronoi algorithm (thiessen polygons) in pyQGIS

This is a python script that takes a set of points as vector layer and returns a weighted voronoi diagram using pyQGIS

• How it works :

  1- convert the vector file to a raster file with a single band to wich the value of the weight is assigned

  2- compute for each points the euclidean distance grid

  3- apply the weights to the distance, in this script I divide the distance by the weight ( you can change it to a more suited mathematical transformation)

  4- assign each pixel to the nearest points considering its weight

  5- convert the result raster to a vector layer (shapefile)

• How to use it :

  get your vector layer and name the weight attribute z

  launch the python console in QGIS and tape the following :

  import sys
  sys.argv="Path/to/your/vector/layer"
  execfile("Path/to/this/script.py")
  

  for QGIS 3 using python 3 use this instead:

  import sys
  sys.argv="Path/to/your/vector/layer"
  exec(open("Path/to/this/script_python3.py").read())
  

NB: the input vector file must be an ESRI shapefile