Frank,
It's just that EPSG:31469 is the equivalent of the PRJ file output you
presented.
I guess you're looking at some very high resolution (LIDAR?) data. Would be
interesting to know how they georeferenced that data to understand possible
problems in (systematic) shifts. Frank Warmerdam (the guy behind GDAL)
has suggested that (re)projections are generally precise within a few
meters, if
you use EPSG parameters (you'll notice a difference in precision already
between
the SRTEXT output and your PRJ parameters).
GL
Frank Durstewitz wrote:
Thanks Guido,
i found this record (and others which look similar), but it's not the
same and i need the exact definition.
The data i have to examine is claimed to be the exactest data
available for building positions in germany (top roof), and i have to
verify this very careful, because the whole dataset is very expensive.
Anyone other ideas?
TIA, Frank
Guido Lemoine am 29.07.2008 08:56:
Frank,
Look at EPSG=31469
"PROJCS["DHDN / Gauss-Kruger zone
5",GEOGCS["DHDN",DATUM["Deutsches_Hauptdreiecksnetz",SPHEROID["Bessel
1841",6377397.155,299.1528128,AUTHORITY["EPSG","7004"]],AUTHORITY["EPSG","6314"]],PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],UNIT["degree",0.01745329251994328,AUTHORITY["EPSG","9122"]],AUTHORITY["EPSG","4314"]],PROJECTION["Transverse_Mercator"],PARAMETER["latitude_of_origin",0],PARAMETER["central_meridian",15],PARAMETER["scale_factor",1],PARAMETER["false_easting",5500000],PARAMETER["false_northing",0],UNIT["metre",1,AUTHORITY["EPSG","9001"]],AUTHORITY["EPSG","31469"]]"
GL
Frank Durstewitz wrote:
Hi together,
please, can someone convert the prj definition below into a insert
statement for use in spatial_ref_sys?
I got some data for evaluation, but since the datum is not in my
spatial_ref_sys, i'm stuck. And i'm not sure how to create the
necessary sql.
PROJCS["Transverse_Mercator",GEOGCS["Geographic Coordinate
System",DATUM["D_DEUTSCHES_HAUPTDREIECKSNETZ",SPHEROID["Bessel
1841",6377397.155,299.1528131060786]],
PRIMEM["Greenwich",0],UNIT["degree",0.0174532925199433]],
PROJECTION["Transverse_Mercator"],PARAMETER["scale_factor",1],
PARAMETER["central_meridian",12],PARAMETER["latitude_of_origin",0],
PARAMETER["false_easting",4500000],
PARAMETER["false_northing",0],UNIT["Meter",1]]
TIA, Frank
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Guido Lemoine
Joint Research Centre, European Commission
Institute for the Protection and Security of the Citizen (IPSC)
Support to External Security
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Tel. +39 0332 786239 (direct line) Fax. +39 0332 785154
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