[postgis-users] Projections for Australia

[Simon Greener]

Try EPSG:3112 which is a Lambert Conformal Conic projection for all of Australia

"PROJCS["GDA94 / Geoscience Australia Lambert",
GEOGCS["GDA94",DATUM["Geocentric_Datum_of_Australia_1994",
SPHEROID["GRS1980",6378137,298.257222101,
AUTHORITY["EPSG","7019"]],TOWGS84[0,0,0,0,0,0,0],
AUTHORITY["EPSG","6283"]],PRIMEM["Greenwich",0,
AUTHORITY["EPSG","8901"]],UNIT["degree",0.01745329251994328,
AUTHORITY["EPSG","9122"]],
AUTHORITY["EPSG","4283"]],
PROJECTION["Lambert_Conformal_Conic_2SP"],
PARAMETER["standard_parallel_1",-18],
PARAMETER["standard_parallel_2",-36],
PARAMETER["latitude_of_origin",0],
PARAMETER["central_meridian",134],
PARAMETER["false_easting",0],PARAMETER["false_northing",0],UNIT["metre",1,AUTHORITY["EPSG","9001"]],AUTHORITY["EPSG","3112"]]"

regards
Simon

On Fri, 13 Jun 2008 09:39:59 +1000, Mark Leslie <mrk.leslie at gmail.com> wrote:

> 2008/6/13 Shane Butler <shane.butler at gmail.com>:
>> Dear list members,
>>
>> Can anyone recommend the appropriate meter-based projection to use for
>> Australia?  I understand this is preferable to a lat-long projection
>> (such as GDA94 which is what I normally use).  WGS84 has many zones
>> and hence postgis complains about using different SRIDs when
>> calculating distance between points in multiple WGS84 zones.  Any
>> suggestions?
>>
>> Regards,
>> Shane
>> _______________________________________________
>> postgis-users mailing list
>> postgis-users at postgis.refractions.net
>> http://postgis.refractions.net/mailman/listinfo/postgis-users
>>
>
> NSW Lambert, epsg:3308, would be appropriate for NSW, as you may
> guess.  There are also the MGA zones 48-58 (epsg:28348-28358)  I'm not
> aware of a single projection for all of Australia, likely due to the
> warping as you move away from the central meridian.  Australia is big.
> The distortion across one MGA zone usually isn't tragic, if your
> points are near the boundary.  If you need to compare across more than
> that I would think you're better off with something more geodetic,
> like ST_distance_spheroid.
>



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