Dear all, I'm trying to build up an r function able to check if the projection system of a layer is in Lambert93 (WSG code : 2154) . If the condition is false I want to transform the CRS into Lambert 93.
This is what I wrote : > CRSfunction<-function(couche) + { + prj_couche<-CRS(couche) + prj<-CRS("+proj=lcc +lat_1=49 +lat_2=44 +lat_0=46.5 +lon_0=3 +x_0=700000 +y_0=6600000 +ellps=GRS80 +units=m +no_defs") + if (prj_couche!=prj) + {CRS(couche)="+proj=lcc +lat_1=49 +lat_2=44 +lat_0=46.5 +lon_0=3 +x_0=700000 +y_0=6600000 +ellps=GRS80 +units=m +no_defs" } + } > CRSfunction(UH) Error in CRS(couche) : no method for coercing this S4 class to a vector In addition: Warning message: In is.na(projargs) : is.na() applied to non-(list or vector) of type 'S4' Called from: CRS(couche) Browse[1]> Q Does anybody can help to deal with the mistake I 've made ?? Plus, I'm not sure the function will work with both raster and shapefiles. Cheers. Tristan Bourgeois. R New User [[alternative HTML version deleted]] _______________________________________________ R-sig-Geo mailing list R-sig-Geo@r-project.org https://stat.ethz.ch/mailman/listinfo/r-sig-geo