Hi, I have a SpatialPolygon that I have created through a series of processing steps. The SP consists of one outer-boundary, with a series of holes punched in it - think of it as the coastline of an island with a series of lakes in it. However, I am only interested in the "external" coastline and don't want the "lakes". How do I best remove these holes?
Here is what I have tried so far (bufr is the object of interest) holes <- sapply(bufr@polygons[[1]]@Polygons,slot,"hole") bufr.hole.free <- bufr bufr.hole.free@polygons[[1]]@Polygons <- bufr.hole.free@polygons[[1]]@Polygons[!holes] bufr.hole.free@polygons[[1]]@plotOrder <- as.integer(rank(bufr.hole.free@polygons[[1]]@plotOrder[holes])) However, this fails when I try to use it later with rgeos: roi.raw <- gDifference(bufr.hole.free,borders) Error in RGEOSBinTopoFunc(spgeom1, spgeom2, byid, id, "rgeos_difference") : lengths of comment and Polygons slot differ How should I remove the holes in a manner that maintains the integrity of the SpatialPolygons class? Mark _______________________________________________ R-sig-Geo mailing list R-sig-Geo@r-project.org https://stat.ethz.ch/mailman/listinfo/r-sig-geo
