[R-sig-Geo] extract by polygon ID

[ppanday]

Hi 

I have a vector polygon which has 3 categories. I am trying to extract a
raster(and rastergroup) using this vector and then summarize by the Id (3
polygon categories). Thanking ahead for any suggestions. 

Prajjwal

> test.vec
class       : SpatialPolygonsDataFrame 
nfeatures   : 1736 
extent      : -52.54233, -52.27729, -13.16048, -12.68169  (xmin, xmax, ymin,
ymax)
coord. ref. : NA 
nvariables  : 1
names       : Id 
min values  :  0 
max values  :  3

 







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