I have a large raster file with elevation data. From this raster, I would like to infer the average ruggedness for different geographic zones (like countries). I have the "countries shapefile" as a separate polygon shapefile.
I was able to get a raster file with a ruggedness measure.
However, this raster is still very large. It is therefore not possible to convert it to a shapefile to do a spatial join of the two shapefiles.
Since I do not need very precise data, is it possible to either:
- convert my raster to a shapefile with an output that has larger cells than the default (I did not find this option)
- directly spatially join the raster to the polygon shapefile
Do you have any advice?
I use ArcGis10, Gdal, and Qgis 1.8