Rescaling Algorithm in GRASS

[WenLing]

Dear GRASS users:

I would like to know how GRASS generate a "rescaled" map from a raster map with
 different resolution.  (For example, the resolution of default map in GRASS is
 10*10 meters.  I change them to 20*20 meters.)

Does anyone know which algorithm is used and which program in the GRASS LIB I s
hould look at?

Thanks you in advance.
   
Wen-Ling Kuo
Research Assistant
Soil/Water Lab, ABEN
Cornell University
Ithaca, NY 14853

e-mail:wk14 at cornell.edu