[GRASSLIST:4859] r.surf.contour, 0 == null ??

[H. Bowman]

Hi -

r.surf.contour seems to be treating the 0m contour line as null values, 
thus obscuring all the low lying topography.


The man page seems to suggest this is by design, but I guess that the 
program just hasn't been updated to deal with zeros as real numbers?

Negative valued isobaths seem to work.


Using r.mapcalc to make the 0m contour a 1m contour does get around the 
problem, and otherwise the module puts out very nice results.


thanks