Andrea Aime a écrit :
> A user addressed us with the following projection:
>
> PROJCS["CH1903 / LV03", GEOGCS["CH1903",DATUM["CH1903",SPHEROID["Bessel
> 1841",6377397.155,299.1528128
> AUTHORITY["EPSG","7004"]],TOWGS84[674.374,15.056,405.346,0,0,0,0],
> AUTHORITY["EPSG","6149"]], PRIMEM["Greenwich",0,
> AUTHORITY["EPSG","8901"] ], UNIT["degree",0.01745329251994328,
> AUTHORITY["EPSG","9122"] ], AUTHORITY["EPSG","4149"] ],
> PROJECTION["Hotine_Oblique_Mercator"],
> PARAMETER["latitude_of_center",46.95240555555556],
> PARAMETER["longitude_of_center",7.439583333333333],
> PARAMETER["azimuth",90],
> PARAMETER["rectified_grid_angle",90],
> PARAMETER["scale_factor",1],
> PARAMETER["false_easting",600000],
> PARAMETER["false_northing",200000],
> UNIT["metre",1,
> AUTHORITY["EPSG","9001"]],
> AUTHORITY["EPSG","21781"]]
I just tried the following:
java org.geotools.referencing.factory.epsg.DefaultFactory 21781
and got:
PROJCS["CH1903 / LV03",
GEOGCS["CH1903",
DATUM["CH1903",
SPHEROID["Bessel 1841", 6377397.155, 299.1528128,
AUTHORITY["EPSG","7004"]],
TOWGS84[674.4, 15.1, 405.3, 0.0, 0.0, 0.0, 0.0],
AUTHORITY["EPSG","6149"]],
PRIMEM["Greenwich", 0.0, AUTHORITY["EPSG","8901"]],
UNIT["degree", 0.017453292519943295],
AXIS["Geodetic latitude", NORTH],
AXIS["Geodetic longitude", EAST],
AUTHORITY["EPSG","4149"]],
PROJECTION["Oblique Mercator", AUTHORITY["EPSG","9815"]],
PARAMETER["longitude_of_center", 7.439583333333333],
PARAMETER["latitude_of_center", 46.952405555555565],
PARAMETER["azimuth", 90.0],
PARAMETER["scale_factor", 1.0],
PARAMETER["false_easting", 600000.0],
PARAMETER["false_northing", 200000.0],
PARAMETER["rectified_grid_angle", 90.0],
UNIT["m", 1.0],
AXIS["Easting", EAST],
AXIS["Northing", NORTH],
AUTHORITY["EPSG","21781"]]
It look like similar to the user CRS, except that TOWGS84 parameters are
slightly differents and the projection is "Oblique Mercator" instead of "Hotine
Oblique Mercator".
I checked manually in the EPSG database version 6.12 (just to make sure that the
difference is not a EPSG-HSQL bug), and the EPSG database really defines
"Oblique Mercator" (operation method EPSG:9815) for "CH1903 / LV03" (coordinate
reference system EPSG:21781, coordinate operation "Swiss New Grid" EPSG:19922).
Martin
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