[GRASS-user] Working with a large number of maps

[Craig Leat]

Hi

I have 139 high resolution images, which I need to use as a background map
for some digitizing work. Loading 139x3 layers into gis.m is a real pain and
I can think of three workarounds.

1.  Enter Rainer Krug and MapServer.
I don't think my time frames allow for learning another software suite right
now.

2.  Use a script to build a .grc file with a group for gis.m.
Before attempting this I would like to know if there are any limits to the
number of layers that can be loaded.

3.  Use r.patch to build one mosaic for each band.
I currently have r.patch running. It's been going for about 10.5hrs and has
reached 15%. Does this sound reasonable? I am starting to wonder if I'm
expecting too much. Here are my region settings:

GRASS 6.3.0RC3 (msunduzi_lo31):~ > g.region -p
projection: 99 (Transverse Mercator)
zone:       0
datum:      wgs84
ellipsoid:  wgs84
north:      -3264858.18753122
south:      -3295545.14772988
west:       -92005.31394386
east:       -43582.78768323
nsres:      0.35000012
ewres:      0.35000019
rows:       87677
cols:       138350
cells:      12130112950

Another question on the usage of r.patch:
I have passed the option --verbose to r.patch and I am expecting the program
to generate VERBOSE output, but all I'm seeing is the following:

GRASS 6.3.0RC3 (msunduzi_lo31):~ > r.patch input=$MAPS
output="aerial_mosaic.red" --overwrite --verbose
r.patch: percent complete:
  15%

Comments and pointers most welcome.

Craig
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