I work with lat-lon coordinate files. I have been successful in importing
both raster and site data into GRASS with the lat-lon coordinate system.
The problem is in getting my vector files (state, country borders, rivers,...)
into GRASS. I've looked at the output of v.out.ascii and tried mimicing
its format but all I get is nothing in the vector binary file and
v.in.ascii dumps <?? latvalue lonvalue> to the screen for all of my 30,000+
points in my line segments.
Write a {perl,awk,c,emacs} program to shift each lat/lon pair over one column.
Leave column 1 open with a space.
While I have the lists attention:
I'm importing the USGS Lakes and Streams DLG datasets into Grass.
When done, (adding cr/lf where appropriate), there are vector
programs to run -
v.clean - remove dead lines
v.proj - convert the Albers to Lat/Lon
v.patch - merge vector sets
v.prune - thin vector lines by removing points
v.spag - rationalize haphazard digitization
v.trim - trim short lines and spurs
In what order should these be run? What are suitable values?
The original data is 1:200000, but will be used with 30-arc-sec
DEM on a fairly small scale. v.prune moves the data too much
to use for hydrologic modeling. Any thoughts?
Tim Szeliga tim@snow.nohrsc.nws.gov CURRENTLY READING - "Forty-Seventeen"
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It's a rather pleasant experience to be alone in a bank at night.
Willie Sutton