Hi Maning, For NAD83 you need to convert the Datum to WGS84. The WKT string you show does not include that conversion. Proj.4 is missing these in a lot of cases.
Try this string instead: PROJCS["NAD83_California_zone_5_ftUS",GEOGCS["GCS_North_American_1983",DATUM["D_North_American_1983",SPHEROID["GRS_1980",6378137,298.257222101]],TOWGS84[-0.9956,1.9013,0.5215,0.025915,0.009426,0.011599,-0.00062],PRIMEM["Greenwich",0],UNIT["Degree",0.017453292519943295]],PROJECTION["Lambert_Conformal_Conic"],PARAMETER["standard_parallel_1",35.46666666666667],PARAMETER["standard_parallel_2",34.03333333333333],PARAMETER["latitude_of_origin",33.5],PARAMETER["central_meridian",-118],PARAMETER["false_easting",6561666.667],PARAMETER["false_northing",1640416.667],UNIT["Foot_US",0.30480060960121924]] Hopefully that works for you. Let me know if it doesn't. Daniel Fenton Software Engineer Esri R&D On Mon, Feb 8, 2016 at 6:56 AM maning sambale <[email protected]> wrote: > Hi, > > I'm trying to convert LA City building data from State Plane to EPSG:4326. > I converted the data using ogr2ogr. Visually inspecting using Bing > imagery, I'm seeing an offset. > > Details of SRS info and sample images here: > https://gist.github.com/maning/093a866fd465ea880032 > > It is possible that Bing has the offset, but the source of Bing comes > from LARIAC (Los Angeles Region Imagery Acquisition Consortium) > imagery, the same source as the building footprints were traced. > > Any hints on the "proper" conversion from State Plane to EPSG:4326. > > -- > cheers, > maning > ------------------------------------------------------ > "Freedom is still the most radical idea of all" -N.Branden > https://epsg4253.wordpress.com/ > http://twitter.com/maningsambale > ------------------------------------------------------ > _______________________________________________ > gdal-dev mailing list > [email protected] > http://lists.osgeo.org/mailman/listinfo/gdal-dev
_______________________________________________ gdal-dev mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/gdal-dev
