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Net.Noise owner news at
Sat Mar 6 23:21:58 EST 1993

Newsgroups: info.grass.user
From: shapiro at (Michael Shapiro)
Subject: Re: v.transform
Message-ID: <C3I44L.8rJ at>
Sender: news at (Net.Noise owner)
Organization: US Army Corps of Engineers Construction Engineering Research Labs
References: <9302192112.AA27794 at>
Date: Sun, 7 Mar 1993 04:21:57 GMT
Lines: 38

In <9302192112.AA27794 at> bac at (Brian Connelly) writes:

Look for v.proj in 4.1. GRASS 4.1 adopted the projection library
from mapgen (which I beleive is based on GCTP). With this you should
be able to project vector data to/from most projections, including
the state plane systems. This capability doesn't (yet) support
NAD27 -> NAD83 datum shift, however. v.transform will only approximate
the transformation. v.proj should do a much better job.

(I would like to say would, but until the beta test is finished and perhaps
well into 4.1 I

>I need to transform some data in ascii vector format and
>state plane coordinates into UTM coordinates.  I noticed
>that v.transform can do this if you provide it with a
>file containing 4-10 transformation points.  Can anyone
>suggest a way to determine these transformation points?
>Also, the man pages for v.transform says that it does not
>work very well with states using the Lambert Conformal
>Conic Projection.  Does it work well at all and how do I
>determine how well it is working?

>Thank you,


>Brian Connelly
>College of Forest Resources                  phone:  (206) 543-5506
>University of Washington  AR-10                FAX:  (206) 685-3091
>Seattle, Washington  98195                  e-mail:  bac at

Michael Shapiro U.S. Army CERL
Environmental Division       

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