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$ ogr2ogr -f "GeoJSON" test.geojson -t_srs EPSG:4326 PG:"host=localhost user=postgres dbname=sp_join port=5432" -sql 'select gid, geom from test'

I am using the following code in ogr2ogr to export a table from PostGIS to GeoJSON, but get the following errors: 

ERROR 1: Reading EWKB with 4-dimensional coordinates (XYZM) is not supported
ERROR 1: Reading EWKB with 4-dimensional coordinates (XYZM) is not supported
ERROR 1: Reading EWKB with 4-dimensional coordinates (XYZM) is not supported
ERROR 1: Reading EWKB with 4-dimensional coordinates (XYZM) is not supported
ERROR 1: Reading EWKB with 4-dimensional coordinates (XYZM) is not supported
ERROR 1: Reading EWKB with 4-dimensional coordinates (XYZM) is not supported

How can I avoid 4-dimensional coordinates?

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  • 2
    use -dim XY or similar – Mike T Dec 12 '16 at 1:10
  • thanks. where would that go in the ogr2ogr request? – the_darkside Dec 12 '16 at 1:12
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    anywhere near the end; see usage for ogr2ogr – Mike T Dec 12 '16 at 2:11
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You can remove unwanted ordinates with any of:

So you could modify your -sql argument like this:

-sql 'select gid, st_force2d(geom) from test'
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  • thanks, how would that be included in the code? I try select gid, geom from test; ST_Force2D(geom) and get a syntax error – the_darkside Dec 12 '16 at 1:16
  • Do not change the correct syntax that is used in the answer. – user30184 Dec 12 '16 at 5:14

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