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extract function extracting only NA values

Fabio Berzaghi 
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

Thread (3 messages)

Fabio Berzaghi extract function extracting only NA values Apr 24 Fabio Berzaghi extract function extracting only NA values Apr 24 Fabio Berzaghi extract function extracting only NA values Apr 24