GIS Overlay – How to Overlay Shapefile and Raster

gdalpythonrastershapefilespatial statistics

I have a shapefile with polygons. And I have a global raster file. I want to overlay the shapefile's polygons onto the raster grid and calculate the mean raster value for each polygon.

How can I do this using GDAL, writing the results to the shapefile?

Best Answer

In R you can do

library(raster)
library(rgdal)
r <- raster('raster_filename')
p <- readOGR('shp_path', 'shp_file')
e <- extract(r, p, fun=mean)

e is a vector with the mean of the raster cell values for each polygon.

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