[R-sig-Geo] Boundary of SpatialGridDataFrame ?

[Agustin Lobo]

Is it possible to get the boundary polygon
of a SpatialGridDataFrame object resulting from
a geotif image imported through rgdal?

My goal is to divide that rectangle
into two polygons defined by a
"SpatialLinesDataFrame" object (shp imported through
readOGR) and then overlay on the SpatialGridDataFrame object
to extract raster values from each polygon and compare.

Thanks!

Agus
-- 
Dr. Agustin Lobo
Institut de Ciencies de la Terra "Jaume Almera" (CSIC)
LLuis Sole Sabaris s/n
08028 Barcelona
Spain
Tel. 34 934095410
Fax. 34 934110012
email: Agustin.Lobo at ija.csic.es
http://www.ija.csic.es/gt/obster