Get raster frequency per class from polygon input areas

Get the frequency per class of raster values represented in the input raster dataset when restricted to the input watershed polygons for a target city. This ignores NA.

get_raster_val_classes(raster_object, polygon)

Arguments

raster_object	character. An object of class RasterLayer.
polygon	character. A polygon to define spatial boundary of raster value counts (e.g. a given city's watersheds)

Value

table of crop types present and their frequency of occurrence

Author

Chris R. Vernon (chris.vernon@pnnl.gov)