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I have a shapefile with following projection information:

PROJCS["kl2",GEOGCS["kl3",DATUM["D_Everest_1830",SPHEROID["Everest_1830",6377299.36,300.8017]],PRIMEM["Greenwich",0.0],UNIT["Degree",0.0174532925199433]],PROJECTION["Polyconic"],PARAMETER["False_Easting",0.0],PARAMETER["False_Northing",0.0],PARAMETER["Central_Meridian",76.5],PARAMETER["Latitude_Of_Origin",8.5],UNIT["Meter",1.0]]

How can I convert this datum to WGS 1984?

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  • @underdark I'm not sure this is a duplicate, or at least not to the listed. This crs is custom, so it has no wkid, also datum/geocrs is unidentified, so there's no oblivious transformation.
    – mkennedy
    Commented Oct 13, 2016 at 21:16

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If the projection information is from the .prj file of the shapefile bundle, you can simply run

ogr2ogr -t_srs EPSG:4326 dst_datasource_name src_datasource_name

If the shapefile lacks the .prj file, put the given string in a text file, and save it as name.prj where name is the same as in name.shp.

Note that coordinates that are stored in the attribute table will not get reprojected.

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Since the original is in everest, simple transformation will shift the result from actual position in wgs around 200m.

The system is polyconic so you will have to ask the local gis experts for transformation parameters. If it were in transverse mercator i could provide the parameter i use.

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