Hello, I would like to add rasters to a plotRGB plot, but they don't seem to register correctly with the initial (=background) raster plotted, as illustrated with the following code. Does anybody out there know of a way to ensure that additional overlain rasters register spatially with the initially plotted background raster? If not possible with plotRGB, what other function would you use for this task? (it also appears that SPDF's and their ilk have the same issue when trying to add to a plotRGB plot) Thanks kindly.
library(raster) #create initial background raster side.length <- 100 r1 <- raster(nrow = side.length, ncol = side.length, ext = extent(0,side.length, 0, side.length)) r2 <- r3 <- r1 r1[]<- 200; r2[]<- 210; r3[]<- 230 stack1 <- stack(r1, r2, r3) #create extents of rasters to plot on top of background ex.1 <- extent(side.length * 0.1, side.length * 0.9, side.length * 0.1, side.length * 0.9) ex.2 <- extent(side.length * 0.05, side.length * 0.95, side.length * 0.05, side.length * 0.95) ex.3 <- extent(side.length * 0.02, side.length * 0.98, side.length * 0.02, side.length * 0.98) rast1 <- crop(t.stack, ex.1)[[1]] rast2 <- crop(t.stack, ex.2)[[1]] rast3 <- crop(t.stack, ex.3)[[1]] #plot and inspect region covered by each raster... x11(10, 10) plotRGB(stack1) #first raster looks centered as it should be... plot(rast1, add = T, col = '#ffff334D', legend = F) plot(ex.1, add = T) #second raster does not look centered, and does not align with its plotted extent plot(rast2, add = T, col = '#ff1a754D', legend = F) plot(ex.2, add = T) #each successive raster should be larger than the first, but they aren't plot(rast3, add = T, col = '#1a75ff4D', legend = F) plot(ex.3, add = T) ___________________________________________ Dave Gregovich Research Analyst Alaska Department of Fish and Game Division of Wildlife Conservation 802 3rd Street Douglas, AK 99824 907-465-4291 ___________________________________________ [[alternative HTML version deleted]] _______________________________________________ R-sig-Geo mailing list R-sig-Geo@r-project.org https://stat.ethz.ch/mailman/listinfo/r-sig-geo