EPSG for Australia

http://spatialreference.org/ref/epsg/3112/

http://spatialreference.org/ref/epsg/4283/

for things like PSMA & GA datasets

notice that Tassie looks better and australia isn't so wiiiide in EPSG:3112

tho, generally speaking EPSG:4283 is better choice as it's there out of the box

Oracle didn't have EPSG:3112 so i created one, EPSG:4283 is srid 4283

INSERT INTO mdsys.SDO_CS_SRS ( CS_NAME, SRID, AUTH_SRID, AUTH_NAME, WKTEXT )
VALUES ('GDA94 / Geoscience Australia Lambert', 3112, 3112, 'EPSG',
'PROJCS["GDA94 / Geoscience Australia Lambert",GEOGCS["GDA94",DATUM["Geocentric_Datum_of_Australia_1994",SPHEROID["GRS 1980",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"]],UNIT["metre",1,AUTHORITY["EPSG","9001"]],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],AUTHORITY["EPSG","3112"]]'
);
COMMIT;