spplot with two rasters
On Tuesday 04 March 2008, Edzer Pebesma wrote:
I find it hard to imagine how you want to plot two raster files on top of each other. Do you want some form of transparency? If it is just one overlaying the other, you could use overlay to find out which cells in raster 1 to replace with those in raster 2 before plotting. -- Edzer
Hi Edzer, I generally agree that plotting one raster file "over" another raster file would be of little use. In this case, one of the raster files (the interesting one) has been masked with nodata, such that it only really covers about 30% of the region of interest. The other raster is just contextual data, and thus would be useful to plot "behind" the first raster. Ideas? Dylan
Dylan Beaudette wrote:
Hi,
Is it possible to plot two raster images using spplot() in a manner
similar to:
pts <- list("sp.points", points_file, pch = 4, col = "black", cex=0.5)
spplot(raster_file, zcol="elev.pred", sp.layout=list(pts))
Note that one of the raster images is an aerial photo, used only for
context, while the second one is one with interesting z-values. The
second raster is masked and thus does not cover the entire region.
Thanks,
Dylan
Dylan Beaudette Soil Resource Laboratory http://casoilresource.lawr.ucdavis.edu/ University of California at Davis 530.754.7341