Hello everybody:
I´ve got rasters, imported using the function raster() from the package
raster grouped in stacks.
I also have SpatialPolygonsDataFrame, which are shapefiles imported using
the function readShapePoly() of maptools.
I need to obtain the frequency distribution for the values of each raster
within the stack, but only for the area falling within the polygon.
How can I select the area of the raster within the polygon? Or can I clip
this area (how?) and then use freq(), of the raster package?
I would appreciate any help.
Thank you,
Frederico Mestre
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