[GRASS-stats] Heuristic assignment of NODATA value in package spgrass6

[Rainer M Krug]

I am confronted with the situation where a raster in grass has only
NULL values.
As I am using grass and R to do simulations, this can happen under
certain situations.
I am doing calculations with these layers also in R ands consequently
I am loading these layers with readRAST6(). But when all values are
NULL in the raster, I get an error message:


> readRAST6("HSericea_seedsDisperse_2007")
ERROR: Invalid value for null (integers only)
Error in readBinGrid(rtmpfl11, colname = vname[i], proj4string = p4,
integer = to_int) :
 no such file:
/home/rkrug/Documents/Projects/AlienSpread/R/../grass/simulation/.tmp/ecolmod/HSericea_seedsDisperse_2007

I would therefore suggest that in this case, an arbitrary value is
assigned to the NODATA  argument to avoid this error.

Thanks

Rainer


-- 
Rainer M. Krug, PhD (Conservation Ecology, SUN), MSc (Conservation
Biology, UCT), Dipl. Phys. (Germany)

Centre of Excellence for Invasion Biology
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University of Stellenbosch
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