Hello,
I have five raster files in ASCII format. With four of them I have no
problem extracting values based on a set of X and Y coordinates.
Unfortunately with one of the files all I managed to extract is NA
values. To verify the problem I have opened the raster with ArcMap and
there are no NA values where I am extracting. I have also plotted the
spatial point class on top of the raster in R and it does correspond to
the correct locations.
These are some of the commands I am using, and as I already pointed out
that works perfectly with other raster files.
sp<-SpatialPoints(xysp)
xy$rasterimg<-extract(rasterimg,sp)
Can anyone help? At this point I am rather clueless about this.
Thanks
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