At our site, we have had need to read unblocked pre-1987 DTED data and
enter it into latitude-longitude projections. To accomplish this, I have
modified the following GRASS utilities:
m.dted.examine
m.dted.extract
r.in.ll
The contributed code is available in the incoming[/OGI] directory on moon.
The updated man page is in troff format as MAN in each of the *tar.Z files.
I will appreciate any feedback on the robustness of the code. I did not
have tapes on which to test the code. The 4.1 version of m.dted.extract
appeared broken to me, due to incorrect variable types in the arguments to
G_scan_northing and G_scan_easting.
The change to r.in.ll may be the most useful of the lot. This allows the
data output by m.rot90 to be read into a lat-lon raster projection, whereas in
the past there was only the UTM option. But in fact, this code
reads any row-by-row binary data surface representing a latitude-longitude
projection, allowing users new (I hope) flexibility for importing data into
lat-lon GRASS raster format.
greg
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Greg Koerper Internet: greg@heart.cor.epa.gov
ManTech Environmental Technology, Inc. UUCP: hplabs!hp-pcd!orstcs!koerper
US EPA Environmental Research Lab
200 SW 35th St., JSB
Corvallis, OR 97333 Rush Limbaugh plucks the heartstrings of America:
(503) 754-4490 "I'm OK, because you're not!"
fax: (503) 754-4338
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