Your df variable should have coordinates in it and in the form of a matrix or SpatialPoints (from ?SpatialGridDataFrame: "points coordinates, either as numeric matrix or as object of class SpatialPoints-class"). Based on the code you provided, I would guess that you have a few columns to spare, and should be removed (kernel, h0) prior to rbinding kcasesC67m and kcontrolC67m .
HTH, Roman On Wed, Aug 25, 2010 at 10:43 AM, Dorothea Lemke < dorothea.le...@uni-muenster.de> wrote: > Dear list, > > I have problems to coerce a SpatialGridDataFrame object to a > SpatialPixelDataFrame. I 've calculated a kerneldensity (splancs) and I > want > to convert the results from the SpatialGridDataFrame to a > SpatialPixelDataFrame. > > My R-code: > > >library (maptools) > >library (splancs) > >library (rgdal) > > > kcasesC67m<-spkernel2d(cases, pRBMS, h0=3500, gt) > > kcontrolsC67m<-spkernel2d(controls, pRBMS, h0=3500, gt) > > df<-data.frame(kcasesC67m=kcasesC67m, kcontrolsC67m=kcontrolsC67m) > > spkratio<-SpatialGridDataFrame(gt, data = df) > > spkratioP<-as(spkratio, "SpatialPixelDataFrame") > > But I get the error message: "No methods and no standards to convert > SpatialGridDataFrame in SpatialPixelDataFrame". > > Many thanks for your help > Dorothea > > _______________________________________________ > R-sig-Geo mailing list > R-sig-Geo@stat.math.ethz.ch > https://stat.ethz.ch/mailman/listinfo/r-sig-geo > -- In God we trust, all others bring data. [[alternative HTML version deleted]] _______________________________________________ R-sig-Geo mailing list R-sig-Geo@stat.math.ethz.ch https://stat.ethz.ch/mailman/listinfo/r-sig-geo
