search for: elevfil

...thus producing: x,y,gridvalue,height,gridcol as variables of the dataframe. The grid dimensions are 1253 x 2001 (=2507253 data points). My attempts with surface3d fail, mainly because I cannot produce the matrix required for the height input. elev.to.list{CTFS} fails with: "Error in matrix(elevfile$elev, nrow= 1+ydim/gridsize, ncol=1+xdim/gridsize. : attempt to set an attribute on NULL" which I assume means it requires a square grid (=quadrates). Any ideas/help appreciated Thanks Herry Dr Alexander Herr Spatial and statistical analyst CSIRO, Sustainable Ecosystems Davies Laboratory,...