do resolution changes effectively average data ?

[James Darrell McCauley]

Malcolm Williamson (malcolm at cast.uark.edu) writes on 18 Jan 95:
>GRASS resamples based on the value of the center cell. If there is no center
>cell (as in your example), it would take the value of the upper-left cell
>out of the center four, *not* the upper-left cell of the 10 x 10 block.

see also ftp://pasture.ecn.purdue.edu/pub/mccauley/grass/s.sample.tar.gz 
and http://soils.ecn.purdue.edu/~aggrass/html4/s.sample.html for info on
sampling rasters at site locations using nearest neighbor, bilinear
interpolation, and cubic convolution.

--Darrell
James Darrell McCauley, USDA National Needs Fellow
Agric Engineering, Purdue University, West Lafayette, IN 47907-1146, USA
mccauley at ecn.purdue.edu    +++   http://soils.ecn.purdue.edu/~mccauley/