[GRASS-user] Determining Datum From Projection Coordinates [SOLVED]

Mark Hall mhall89446 at att.net
Thu Mar 3 15:06:23 EST 2011

Unfortunately, there are all too many government contractors, who because there 
still maps out there in NAD 27 use that as the datum and then give UTM 

It can be done with many GPS units...

Best, Mark Hall

From: Rich Shepard <rshepard at appl-ecosys.com>
To: grass-users at lists.osgeo.org
Sent: Thu, March 3, 2011 6:15:39 AM
Subject: Re: [GRASS-user] Determining Datum From Projection Coordinates [SOLVED]

On Wed, 2 Mar 2011, Michael Perdue wrote:

> Hate to be a wet blanket, but both NAD27 and NAD83 UTM coordinates are
> supposed to be in meters.


  It's been quite a while but I recall data in NAD27 having units of feet.
Regardless, ...

  Since the data have both lat/lon and some version of UTM, I think the best
approach is to use the lat/lon columns to import the data, then v.proj to
the common Albers Equal Area location.

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