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 <[EMAIL PROTECTED]> wrote: > 2008/6/13 Shane Butler <[EMAIL PROTECTED]>: >> 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 >> [email protected] >> 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. > -- SpatialDB Advice and Design, Solutions Architecture and Programming, Oracle Database 10g Administrator Certified Associate; Oracle Database 10g SQL Certified Professional Oracle Spatial, SQL Server, PostGIS, MySQL, ArcSDE, Manifold GIS, Radius Topology and Studio Specialist. 39 Cliff View Drive, Allens Rivulet, 7150, Tasmania, Australia. Website: www.spatialdbadvisor.com Email: [EMAIL PROTECTED] Voice: +613 9016 3910 Mobile: +61 418 396391 Skype: sggreener Longitude: 147.20515 (147° 12' 18" E) Latitude: -43.01530 (43° 00' 55" S) NAC:W80CK 7SWP3 _______________________________________________ postgis-users mailing list [email protected] http://postgis.refractions.net/mailman/listinfo/postgis-users
