My goal is to modify an existing shapefile by merging certain polygons.
After importing the shapefile and using the UnionSpatialPolygons command, I get the polygon outline that I want.
However, this is now a SpatialPolygons object and not a SpatialPolygonsDataFrame, so I'm unable to export it to a shapefile using writeOGR.
How can I get around this problem?
Thanks in advance,