[R] extract function extracting only NA values

Fabio Berzaghi fabe at dmu.dk
Wed Apr 24 13:52:34 CEST 2013

So I think I might have found what is causing this problem. The values I 
have in this raster

 > summary(ps0011yme)
Min.        -9458.911
1st Qu.   1955256.000
Median   10618870.000
3rd Qu.  79577730.000
Max.    167780500.000
NA's            0.000

 From ArcMap though I get different values
min -69826224 and max 167780496

So maybe when I am importing the rest are in R something goes wrong and 
all the values below a certain threshold are considered NA. Is this a 
bug or do I get to use a specific parameter for the raster function?

On 4/24/2013 13:10, Fabio Berzaghi wrote:
> 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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