From: "R.A.Sanderson" <R.A.Sanderson@newcastle.ac.uk>
Is there a simple way of using two map projections simultaneously in GRASS?
I have a GRASS location in UTM, but need to add new maps by digitising
from base maps stored as latitude-longitude. The v.digit command only
seems able to cope with digitising using the same projection as the
original location (in this case UTM). I could resort to using Arc/Info for
digitising, then PROJECT/TRANSFORM into UTM before exporting to GRASS, but
I'd prefer to carry out the whole operation in GRASS if possible.
Yes, use the v.proj command to project your utm location to lat/long
Usage:
v.proj map=name [out=name] inloc=name [dbase=name] [set=name]
Parameters:
map input vector file name
out output vector file name
inloc Location containing INput vector map
dbase Database containing INput location
set mapset containing INput vector map
You can also use v.proj to shift your datum from nad27 to nad83. Just
create a file called DATUM_INFO under your PERMANENT mapset. The file
contains 2 lines:
datum: nad27 or nad83
region: conus
v.proj is a contributed command under the src.contrib/SCS/mapdev/v.proj
directory.
Jill
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Jill R. Schuler
USDA
Natural Resource Conservation Service
2627 Redwing, Suite 120
Ft. Collins, Co 80526 FAX: (970) 282-1930
VCOMM:9010-2418
e-mail: jschuler@itc.nrcs.usda.gov Phone: (970) 282-2418