Thanks again for the fast reply,
In fact this problem is only a tiny part of the project and I'll need
to run this overlay operation over more than 600 polygons (watersheds)
to get mean values (and standard error) of ~10 environmental variables
(rasters that are not at the same resolution,
Many thanks for the fast replies,
@ Roger : polygons and raster are ok (see attached file).
@ Johannes : I have already try this but the result was not satisfying, using
a SpatialPointsDataFrame do not solve the problem as the points are not inside
the polygon (see attached file).
I gues
Dear list member,
Although the answer to this might be straightforward I'm struggling with this
issue for weeks now :
I have a shapefile (only one polygon) and a raster (.tif). I would like to
know the value of each pixel on the raster which overlap with the polygon in
the shapefile.
I ha
