[gdal-dev] towgs84 for epsg3035

christian.mueller at nvoe.at christian.mueller at nvoe.at
Mon Nov 22 08:41:57 EST 2010


Why do you need toWGS84  params for converting wgs84 -->epsg:3035.
I always thought toWGS84 params are needed  for the other way around.
But I am not an expert :-)

ASFAIK the params are all 0. I use this definition

PROJCS["ETRS89 / ETRS-LAEA",
GEOGCS["ETRS89",
DATUM["European_Terrestrial_Reference_System_1989",
SPHEROID["GRS 1980",6378137,298.257222101,AUTHORITY["EPSG","7019"]],
TOWGS84[0,0,0],
AUTHORITY["EPSG","6258"]],
PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],
UNIT["degree",0.01745329251994328,AUTHORITY["EPSG","9122"]],AUTHORITY["EPSG","4258"]],
UNIT["metre",1,AUTHORITY["EPSG","9001"]],
PROJECTION["Lambert_Azimuthal_Equal_Area"],
PARAMETER["latitude_of_center",52],
PARAMETER["longitude_of_center",10],
PARAMETER["false_easting",4321000],
PARAMETER["false_northing",3210000],
AXIS["X",EAST],
AXIS["Y",NORTH],
AUTHORITY["EPSG","3035"]]

Cheers
Christian



Quoting Agustin Lobo <alobolistas at gmail.com>:

> Hi!
>
> I have to convert a pair of geographic coordinates in wgs84
> to epsg:3035 (GRS80 ellipsoid). Where can I find the appropriate
> towgs84 parameters? This is to set the NW corner coordinates
> of a tifw file for a tif file with elevations of Europe in epsg:3035  
>  projection
> (http://www.eea.europa.eu/data-and-maps/data/digital-elevation-model-of-europe)
>
> A *.tif.xml file provides geographic coordinates for the NW corner (
> -38.04824, 72.66958) but have to convert
> to epsg:3035.
>
> Thanks,
>
> Agus
> _______________________________________________
> gdal-dev mailing list
> gdal-dev at lists.osgeo.org
> http://lists.osgeo.org/mailman/listinfo/gdal-dev
>



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