[postgis-users] Coordinate transformation problem

[Arnaud Lesauvage]

Guido Lemoine a écrit :
> Are you sure your Belgian Lambert 1972 has SRID 31370, and not 31300??

I tried both projections actually ("Belge 1972" and "Belgian 
1972").

The content of my .prj file is :
PROJCS["Belge_Lambert_1972",
GEOGCS["GCS_Belge_1972",
DATUM["D_Belge_1972",SPHEROID["International_1924",6378388,297]],
PRIMEM["Greenwich",0],
UNIT["Degree",0.0174532925199432955]],
PROJECTION["Lambert_Conformal_Conic"],
PARAMETER["False_Easting",150000.01256],
PARAMETER["False_Northing",5400088.4378],
PARAMETER["Central_Meridian",4.367486666666666],
PARAMETER["Standard_Parallel_1",49.8333339],
PARAMETER["Standard_Parallel_2",51.16666733333333],
PARAMETER["Latitude_Of_Origin",90],UNIT["Meter",1]]

If you check in your spatial_ref_sys table, this is 31370.

I have even added a new line in spatial_ref_sys with this 
projection's exact parameters, but the difference with the 
"real" 31370 projection is only ~2 or 3 millimeters.

--
Arnaud