Dear List,

I am trying to do the following:
I have a shapefile, that I want to overlay with a raster and then assign
each raster cell a value that represents the percentage covered by the shape
file. I have found a way to do that with small data sets, but I am
struggling with large datasets (1mio+ cells).

My approach so far is:

1.) Create rectangular polygons (covering the whole area), that will be used
for the grid afterwards.
2.) Intersect the each polygon with the shapefile and calculate the area.
3.) Create a grid from the rectangular polygons.

Any suggestions are very welcome!

Thanks in advance

Johannes

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