[GRASS5] Re: grass5 digest, Vol 1 #2162 - 1 msg

GRASS GIS GRASS GIS developer
1

If we could get a command-line module like I proposed for "i.gcp", I (or
Cedric) could write a TckTk GUI wrapper for it.

Michael
______________________________
Michael Barton, Professor of Anthropology
School of Human Evolution and Social Change
Arizona State University
Tempe, AZ 85287-2402
USA

voice: 480-965-6262; fax: 480-965-7671
www: http://www.public.asu.edu/~cmbarton

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Date: Wed, 22 Mar 2006 12:01:06 +0100
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Subject: grass5 digest, Vol 1 #2162 - 1 msg

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2

If we could get a command-line module like I proposed for "i.gcp", I
(or Cedric) could write a TckTk GUI wrapper for it.

The file format of $MAPSET/group/$GROUP/POINTS is very easy to recreate,
the rms error algorithm is easily borrowed & recoded.

for adding GCPs to a TIFF, see also

gdal_translate \
  -gcp pixel1 line1 easting1 northing1 \
  -gcp pixel2 line2 easting2 northing2 \
  -gcp etc \
  src_dataset dst_dataset

In the past to do thin-plate-spline rectification [which GRASS doesn't
do], I've created the GCP POINTS file with i.points and used a script to
parse the POINTS file to feed to gdal_translate, "rectified" (warped)
with gdalwarp, and reload into GRASS with r.in.gdal.

Hamish