[OSRS-PROJ] PROJ4 and datums

[Gerald I. Evenden]

Except for the North American Datum (NAD), PROJ does
not support datum conversions.  PROJ is system for
cartographic projections only.  *nad2nad* was included
in the PROJ distribution as an example of how to use
the PROJ lib.

Jerry Evenden and the low riders: Katie and Daisy-Mae
gevenden at capecod.net  http://www.capecod.net/~gevenden
-----Original Message-----
From: Markus Neteler <neteler at geog.uni-hannover.de>
To: osrs-proj at remotesensing.org <osrs-proj at remotesensing.org>
Date: Monday, April 03, 2000 10:40 AM
Subject: [OSRS-PROJ] PROJ4 and datums


>Hi all,
>
>concerning the datum problem and PROJ4 I have
>a question (as PROJ4 is included in GRASS 5):
>
>Say, I have a map in UTM/WGS84. Using the
>map projection modules of GRASS (r.proj/v.proj)
>I can project the map to the German
>"Gauss-Krueger-System" (Transverse Mercator,
>Bessel Ellipsoid).
>
>But what about datum conversion? Gauss-Krueger
>is based on Potsdam-Datum (near Berlin).
>
>BTW: Interesting page about nearly all European
>map systems (by Stefan A. Vosser):
>http://www.geocities.com/CapeCanaveral/1224/mapref.html
>
>especially: "Map Projections" there.
>
>I am not familiar with this datum stuff, any
>hints to clear the situation are welcome.
>>From former comments I learned that PROJ4 does
>not support datum conversion, but maybe nad2nad
>to be extended to support conversions outside U.S.?
>Please excuse if this is a stupid questions...
>
>Kind regards
>
> Markus Neteler

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