[winGRASS] gen: resampling continuous data

[Matt & Kim]

Hi All,

How does one go about resampling continuous tone data like an elevation model?

'r.resample' only uses nearest neighbour interpolation, which is unsuitable
as it introduces lines when downsampling.

'r.resamp.rst' has a man page but no program (that I could find)

'r.proj', according to the man page, will use bilinear or cubic resampling
but in my test it didn't change anything at all; perhaps one must actually
use 2 different projections? 
(r.proj location=ykdata input=90mdem output=30mdem method=cubic resolution=30)

oh, I just found 'r.bilinear', it almost works - unfortunately it seems to
treat null as zero. My test elevation file changed from 355 - 2695 to 0.5 -
2695.

Are there other programs/approaches I'm missing?

thanks in advance,

-matt

Grass5pre3, 
CYGWIN_NT-5.0 OBELIX 1.3.9(0.51/3/2) 2002-01-21 12:48 i686 unknown