On Thu, 5 Apr 2007, Edzer J. Pebesma wrote: > temiz wrote: > > following the topic GRASS and R kriging interpolation from grass6 tutorial > > > > I came here without problems > > > > But here: > > > > zz <- krige(z ~ 1, locations = el1 , newdata = mask_SG , model = efitted) > > Error in predict.gstat(g, newdata = newdata, block = block, nsim = nsim, : > > var1 : data item in gstat object and newdata have different > > coordinate reference systems > > > > how can I solve this problem ? > > > > How about making sure they are equal? If you know they are equal, do > > proj4string(el1) = CRS(proj4string(mask_SG))
or better: proj4string(mask_SG) = CRS(proj4string(el1)) > > else use spTransform from rgdal to re-project. > > gstat checks that the projection strings are exactly equal; this is a > check too strong, and should be replaced by some check that they > represent exactly the same projection. Does anyone know how to perform > this check? No, OGR/PROJ.4 use ellipse names, GRASS tends to break them out as a=, b=, arguments. The solution if you know that they should be the same is as you give it - the problem is only with the R/GRASS interface. Roger > -- > Edzer > > _______________________________________________ > R-sig-Geo mailing list > R-sig-Geo@stat.math.ethz.ch > https://stat.ethz.ch/mailman/listinfo/r-sig-geo > -- Roger Bivand Economic Geography Section, Department of Economics, Norwegian School of Economics and Business Administration, Helleveien 30, N-5045 Bergen, Norway. voice: +47 55 95 93 55; fax +47 55 95 95 43 e-mail: [EMAIL PROTECTED] _______________________________________________ R-sig-Geo mailing list R-sig-Geo@stat.math.ethz.ch https://stat.ethz.ch/mailman/listinfo/r-sig-geo
