[GRASS5] r.what

[Hamish]

> A silly question: does r.what work with x,y coordinates ? We just
> tried a r.what in such a map, and the xs seem really strange (some of
> the values have a * character). FYI, the top left corner of our maps
> is not 0,0, but 700.5,1000.5...


GRASS:~> r.what --help
[...]
Parameters:
       input   Name of existing raster map
       cache   Size of point cache
               default: 500
        null   Char string to represent no data cell
               default: *
  east_north   Coordinates for query



so the *'s you are seeing represent null values.
using null=NaN or something might be more useful to you if you want to
export the data to Matlab, etc..


regards,
Hamish