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List:       grass-user
Subject:    Re: [GRASS-user] datum itrf 92 not recognised
From:       Markus Neteler <neteler () osgeo ! org>
Date:       2012-09-18 22:17:38
Message-ID: CALFmHhuv_5PPVWqvTSuvZDqNOyHJGTBB-tGnyc-zu8WOFd5JdA () mail ! gmail ! com
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On Sat, Sep 15, 2012 at 2:39 PM, Markus Neteler <neteler@osgeo.org> wrote:
> On Sat, Sep 15, 2012 at 7:51 AM, tigrida <adriana.mata@ipicyt.edu.mx> wrote:
>> Hi all!
>> I want to create a new location in GRASS GIS using a file that uses the ITRF
>> datum 1992 and get the error:
>>
>> g.proj returned the following informational message:
>> WARNING: Datum ITRF_1992 not recognised by GRASS and no parameters found
...

For the record, here the answer:
http://lists.maptools.org/pipermail/proj/2012-September/006413.html

On Tue, Sep 18, 2012 at 11:00 PM, Clifford J Mugnier <cjmce@lsu.edu> wrote:
> Unless you are concerned at the centimeter level of precision, I would
> equate ITRF92 as being identical with WGS84.
>
> Clifford J. Mugnier, c.p., c.m.s.
> Chief of Geodesy
> LSU Center for GeoInformatics (ERAD 266)
> Dept. of Civil Engineering (P.F. Taylor 3531)
> LOUISIANA STATE UNIVERSITY
...
> From: proj-bounces@lists.maptools.org

Hence I have updated GRASS 6.4 to 7 accordingly in r53227 - r53229.

My test data set:
http://mapserver.inegi.org.mx/data/mgm/?s=geo&c=1298
--> Polígonos de Localidades Urbanas Geoestadísticas de Zonas
Pendientes por Asignar (7.43 Kb)

imports (I believe) properly now:

GRASS 6.4.3svn (newLocation5):/tmp > g.proj -w
PROJCS["Lambert Conformal Conic",
    GEOGCS["grs80",
        DATUM["ITRF92",
            SPHEROID["Geodetic_Reference_System_1980",6378137,298.257222101]],
        PRIMEM["Greenwich",0],
        UNIT["degree",0.0174532925199433]],
    PROJECTION["Lambert_Conformal_Conic_2SP"],
    PARAMETER["standard_parallel_1",17.5],
    PARAMETER["standard_parallel_2",29.5],
    PARAMETER["latitude_of_origin",12],
    PARAMETER["central_meridian",-102],
    PARAMETER["false_easting",2500000],
    PARAMETER["false_northing",0],
    UNIT["Meter",1]]

Please try from SVN or tomorrow's snapshot and report any inconsistencies
(or success :). The test is to reproject to a different projection and check the
precision.

Markus
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