ok so i imported the raster as a dataframe and everything is fine
Min. :-69826220
Max. :167780500
so it's something with values lower than -9999 that are interpreted as
NA by the raster function
On 4/24/2013 13:52, Fabio Berzaghi wrote:
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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______________________________________________
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and provide commented, minimal, self-contained, reproducible code.
______________________________________________
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
