On Sat, May 7, 2011 at 7:22 PM, Lmhelp <[email protected]> wrote:
> Thank you Andrea.
>
> Thank you for your explanations about asking PostGIS directly and so on.
> It's a very good start for me!
>
>> By the numbers you get it seems your data is in some projected coordinate
>> system. Which one, I cannot know.
>
> Ah ok... Can it be Lambert93 (SRID = 310024140)?
Uh, may be? But I never heard of that SRID, it's not in the official EPSG
database, nor seems a common ESRI one.
Do you mean EPSG:2154:
PROJCS["RGF93 / Lambert-93",
GEOGCS["RGF93",
DATUM["Reseau Geodesique Francais 1993",
SPHEROID["GRS 1980", 6378137.0, 298.257222101, AUTHORITY["EPSG","7019"]],
TOWGS84[0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0],
AUTHORITY["EPSG","6171"]],
PRIMEM["Greenwich", 0.0, AUTHORITY["EPSG","8901"]],
UNIT["degree", 0.017453292519943295],
AXIS["Geodetic longitude", EAST],
AXIS["Geodetic latitude", NORTH],
AUTHORITY["EPSG","4171"]],
PROJECTION["Lambert Conic Conformal (2SP)", AUTHORITY["EPSG","9802"]],
PARAMETER["central_meridian", 3.0],
PARAMETER["latitude_of_origin", 46.5],
PARAMETER["standard_parallel_1", 49.0],
PARAMETER["false_easting", 700000.0],
PARAMETER["false_northing", 6600000.0],
PARAMETER["scale_factor", 1.0],
PARAMETER["standard_parallel_2", 44.0],
UNIT["m", 1.0],
AXIS["Easting", EAST],
AXIS["Northing", NORTH],
AUTHORITY["EPSG","2154"]]
Knowing the exact spatial reference system of your data is
important, otherwise you don't really know what part of the
earth the data refers to.
Normally the knowledge of the coordinate reference system
is associated in some metadata file, or just otherwise specified
by the data provider
Cheers
Andrea
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Ing. Andrea Aime
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