[GRASS-user] meaning of g.region zoom?

[Paolo Cavallini]

Hi all.
If I zoom to a small map full of nulls, with only a non-nulla area on one side, and
zoom back to the full extent, I do not see the difference:
===
> g.region zoom=los_175_10k at paolo
> g.region -p
projection: 99 (Transverse Mercator)
zone:       0
datum:      rome40
ellipsoid:  international
north:      4834913.78536118
south:      4821192.33020234
west:       1668983.89916058
east:       1685595.88381969
nsres:      100.156607
ewres:      100.07219674
rows:       137
cols:       166
cells:      22742
> g.region zoom=dtm at PERMANENT
> g.region -p
projection: 99 (Transverse Mercator)
zone:       0
datum:      rome40
ellipsoid:  international
north:      4834913.78536118
south:      4821192.33020234
west:       1668983.89916058
east:       1685595.88381969
nsres:      100.156607
ewres:      100.07219674
rows:       137
cols:       166
cells:      22742
===
Where am I wrong?
All the best.
-- 
Paolo Cavallini: http://www.faunalia.it/pc