On 11-06-22 04:31 PM, Rodolfo Bonnin wrote:
Hello Antonio, Frank,
I've now been able to read the false northing UTM parameter. The next
step is the coordinate system, which is ITRF 97. As this is not a well
known coordinate system, could this definition be enough to represent
the standard? (from spatialreference.org):
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
GEOCCS["ITRF97",
DATUM["International Terrestrial Reference Frame 1997",
SPHEROID["GRS 1980",6378137.0,298.257222101,
AUTHORITY["EPSG","7019"]],
AUTHORITY["EPSG","6655"]],
PRIMEM["Greenwich",0.0,
AUTHORITY["EPSG","8901"]],
UNIT["m",1.0],
AXIS["Geocentric X",OTHER],
AXIS["Geocentric Y",EAST],
AXIS["Geocentric Z",NORTH],
AUTHORITY["EPSG","4918"]]
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
Rondolfo,
In GDAL trunk I have added support for geocentric coordinate systems and
the expansion of EPSG:4338 looks like:
GEOCCS["ITRF97 (geocentric)",
DATUM["International_Terrestrial_Reference_Frame_1997",
SPHEROID["GRS 1980",6378137,298.257222101,
AUTHORITY["EPSG","7019"]],
AUTHORITY["EPSG","6655"]],
PRIMEM["Greenwich",0,
AUTHORITY["EPSG","8901"]],
UNIT["metre",1,
AUTHORITY["EPSG","9001"]],
AXIS["Geocentric X",OTHER],
AXIS["Geocentric Y",OTHER],
AXIS["Geocentric Z",NORTH],
AUTHORITY["EPSG","4338"]]
I believe yours if functionally equivelent. Note that GDAL is unlikely
to support geocentric coordinate systems in a useful fashion in 1.8 and
earlier versions.
Best regards,
--
---------------------------------------+--------------------------------------
I set the clouds in motion - turn up | Frank Warmerdam, [email protected]
light and sound - activate the windows | http://pobox.com/~warmerdam
and watch the world go round - Rush | Geospatial Programmer for Rent
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