So I think I might have found what is causing this problem. The values I
have in this raster
> summary(ps0011yme)
layer
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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and provide commented, minimal, self-contained, reproducible code.
