Currently, if you use the -a flag with g.region it will align the
region exactly to match the resolution of a map (e.g. g.region -a
rast=myrast will set the region to exactly the resolution of myrast
regardless of the extents) or the resolution specified in the res or
ewres/nwres fields (e.g. g.region -a n=523 s=15 res=10 will adjust
the extents a little to make sure the resolution is exactly 10).
However, -a is ignored if the map argument (rast=) or resolution
arguments are blank. This means that if you want to change the
extents and keep your current resolution, you need to specify the -a
flag AND explicitly specify the resolution. Otherwise, the resolution
will be adjusted slightly.
Could this be modified so that when the -a flag is used and
resolution is NOT specified and a map is NOT specified (i.e., only
changing extents) it aligns to the current resolution? That is,
respect the -a flag when res/ewres/nsres= is blank and rast= is blank.
Michael
____________________
C. Michael Barton, Professor of Anthropology
Director of Graduate Studies
School of Human Evolution & Social Change
Center for Social Dynamics & Complexity
Arizona State University
Phone: 480-965-6262
Fax: 480-965-7671
www: <www.public.asu.edu/~cmbarton>
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