[OSRS-PROJ] PROJ4 and datums
Gerald I. Evenden
gevenden at capecod.net
Mon Apr 3 11:33:45 EDT 2000
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
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
>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,
>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):
>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...
> Markus Neteler
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