[R-sig-Geo] overlay a "ppp" object and a SpatialPolygon

[Jesse Berman]

Hi Laetitia,

Try turning your .ppp object into a spatial grid data frame, then convert it
to a raster.  The 'extract' function should then work if your projections
are correct.

Jesse  

your.ppp.object<-as.SpatialGridDataFrame.im(your.ppp.object)
rast.ppp.object<- raster(your.ppp.object) #Convert to a raster grid

output<- extract(rast.ppp.object, polys)



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Jesse D Berman, PhD
Yale University
School of Forestry and Environmental Studies
Post-Doc Fellow
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