Dear List,
I use a forest landscape model, which produces 16 bit unsigned ".gis"
raster files. I often read and manipulate them using rgdal and the
raster package in R.
However, sometimes, when I read in a unsigned 16 bit .gis, I get the
following:
stnd <- raster("stand_bm.gis", values = T)
summary(stnd)
Cells: 1474962
NAs : 0
Values
Min. -32140
1st Qu. 0
Median 0
Mean 8316
3rd Qu. 19180
Max. 29620
Where are these negative values coming from? Opening the same file in
ArcGIS confirms what I know to be true:
Pixel Type = unsigned integer
Pixel Depth = 16 bit
Min = 0
Max = 48499
Is there anyway to force raster (or RGDAL) to treat it like an unsigned
integer?
Thank you,
Jonathan Thompson
Harvard Forest
Harvard University
Petersham, MA 01366
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