Geocentric Datum of Australia 1994, was - Re: [GRASS-user] Convert OGR vector layer to GRASS vector map

[Markus Neteler]

On Thu, Jul 16, 2009 at 12:42 AM, Paul
Kelly<paul-grass at stjohnspoint.co.uk> wrote:
> On Wed, 15 Jul 2009, Markus Neteler wrote:
>> +---------------------------------------------------
>> | This map was produced on the Geocentric Datum of Australia 1994 (GDA94).
>> | Heights are referenced to the Australia Height Datum (AHD).
>> | For most practical purposes GDA94 coordinates and satellite derived
>> (GPS)
>> | coordinates based on the World Geodetic Datum 1984 (WGS84) are the same.
>> |
>> | Example 1: Datum information on new map.
>> +---------------------------------------------------
>>
>> Should we add WGS84 as short-cut in the datum table?
>
> No it's a datum in its own right and should have an entry in datum.table
> with ellipsoid GRS80 and dx=dy=dz = 0. Before adding it we would need to
> check what the proper EPSG-based long name should be. I suspect it might be
> "Geocentric_Datum_of_Australia_1994" but will need to make sure.

OK: from http://www.epsg-registry.org/

Geocentric Datum of Australia 1994
Code: EPSG::6283
Type: GeodeticDatum
Status: Valid
Domain of Validity: Australia - all states
Remarks / Description: Coincident with WGS84 to within 1 metre.
http://www.epsg-registry.org/export.htm?gml=urn:ogc:def:datum:EPSG::6283

Markus