Sorry Clifford, but it is a very relevant question for the list.
In the .prj file that comes with version 5.5, support is given for the
MapGrid of Australia (geographic coordinates which use the GDA94 datum), but
the projection file does not include support for latitude/logitudes with
GDA94. The question is why is GDA94 - Lat/Lons not included? Should we be
using WGS84.
I have inserted the following line in my projection file which (I hope)
gives the correct GDA94 projection.
"Longitude / Latitude (GDA 94)", 1, 33
Datum 33 is the GRS80 datum that GDA94 is based on. Could someone please
confirm whether this is corrrect or not.
Thanks
Christopher Prescott
Geospatial International Pty. Ltd.
14 Wheaton Road
Evandale
South Australia 5069
Phone: +61 8 8362 3278
Mobile: 0417 856 109
email: [EMAIL PROTECTED]
-----Original Message-----
From: Clifford J. Mugnier [mailto:[EMAIL PROTECTED]]
Sent: Tuesday, 1 February 2000 14:56
To: 'Adrian Davey'; Mapinfo-L
Subject: RE: MI Australian GDA94
Adrian,
Other than asking for a ".prj" file, I would think that the
MapInfo List is not the place to go for advice on your
topic of interest. Since the Australian Land Information
Group (http://www.AUSLIG.gov.au) is the sole authority on
the topic, I'd recommend that you go there for the last
word on the GDA94.
Chances are, someone at AUSLIG speaks MapInfo, too.
Clifford J. Mugnier ([EMAIL PROTECTED])
The Topographic Engineering Laboratory
Department of Civil and Environmental Engineering
UNIVERSITY OF NEW ORLEANS
New Orleans, Louisiana 70148
Voice and Facsimilie: (504) 280-7095
--------------------------------------------------------
----------------------
On Monday, 31 January, 2000 4:41 PM, Adrian Davey
[SMTP:[EMAIL PROTECTED]] wrote:
> Hi listers
>
> Does anyone have an updated mapinfo.prj file (compatible
> with v4.5)
> which includes provision for the new Australian
geocentric
> datum GDA94?
>
> Or, for practical [i.e. MI] purposes, can it be assumed
> that GDA94 is so
> close to WGS84 that if it were any closer it would be
> exact?
>
__________________________________________________________
> ___________
> ADRIAN DAVEY mailto:[EMAIL PROTECTED]
> Phone: 61 2 6201 2517, Fax: 61 2 6201 5305
> Applied Ecology Research Group
> http://aerg.canberra.edu.au/pub/aerg/home.htm
> School of Resource, Environmental & Heritage Sciences
> http://science.canberra.edu.au/rehs
> UNIVERSITY OF CANBERRA, ACT, 2601, AUSTRALIA
>
>
>
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