I have some shapefiles I thought I would look at in Google Earth, so I
used ogr2ogr (v1.8.1) to convert them to KML:
ogr2ogr -f "KML" Lines_OGR.kml Lines.shp
but they appeared about 100 meters Northeast of my expectation, leading
me to believe there was a Datum problem.
ogrinfo reported (since there is a .prj file created by ArcMap):
Layer SRS WKT:
PROJCS["UTM_Zone_35_Northern_Hemisphere",
GEOGCS["GCS_Geographic Coordinate System",
DATUM["EUROPEAN_DATUM_1950",
SPHEROID["International_1909_Hayford_Intl_1924",6378388,297.0000000284015]],
PRIMEM["Greenwich",0],
UNIT["Degree",0.017453292519943295]],
PROJECTION["Transverse_Mercator"],
PARAMETER["latitude_of_origin",0],
PARAMETER["central_meridian",27],
PARAMETER["scale_factor",0.9996],
PARAMETER["false_easting",500000],
PARAMETER["false_northing",0],
UNIT["Meter",1]]
note the ED50, which is correct for my shapefiles. After a few attempts
experimenting, it was only when I used -s_srs AND -t_srs on the command
line the features were shown where I expected them:
ogr2ogr -s_srs "EPSG:23035" -t_srs "EPSG:4326"...
The part that bothered me was there was no message from ogr2ogr warning
me about source/target SRS issues. It seems counter-intuitive since
ogrinfo was able to intreprete the .prj file of the source data, and the
only (?) allowable SRS of KML is EPSG:4326.
It this a known issue (other than a related
http://trac.osgeo.org/gdal/ticket/2271)?
--
Best Regards,
Brent Fraser
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