I would appreciate answers to any of the following
questions:
1. Are there any modifications of r.reclass which
allow reclassification of data sets which
contain negative data values?
2. Are there any modifications of r.mask which
allow for its noninteractive use?
3. Are there any written guides to the creation
and use of scripts in GRASS?
4. Can scripts for GRASS be run only from within
GRASS, or can they be run from UNIX also?
Thank you.
Karen Bryant
1. Are there any modifications of r.reclass which
allow reclassification of data sets which
contain negative data values?
I am doing that all the time. Is there some limitation in the
software here that I don't know about? For me it seems to work
ok.
2. Are there any modifications of r.mask which
allow for its noninteractive use?
Most of the time I create masks with r.mapcalc.
E.g.: echo "MASK = if ( ...... )" | r.mapcalc
3. Are there any written guides to the creation
and use of scripts in GRASS?
Yes there are some pages in the programming manual.
Good examples are found by looking at the current scripts
that are in Grass and by reading GrassClippings. That is
how I have learned.
4. Can scripts for GRASS be run only from within
GRASS, or can they be run from UNIX also?
Yes, if you are setting up the same global variables in the
shell scripts as Grass is doing. That is $LOCATION, $GISBASE,
$GISDBASE and a couple of others. Type "printenv" and have a look.
Lars
Lars Schylberg Email: larss@fmi.kth.se
Dept. of Geodesy and Photogrammetry
Royal Institute of Technology (KTH) Tel. +46 8 790 86 33
S-100 44 STOCKHOLM, SWEDEN Fax. +46 8 790 66 10