[GIS] Remove 3D geometry in shapefile using OGR

3dogrshapefile

I have a series of shapefiles, that have 3D geometries (ie: points ZM). I would like to remove the 3D geometry so that the files are 2D. Is there a way to remove 3D geometry from a shapefile using OGR?

Best Answer

Write your data into a new shapefile with ogr2ogr and force geometry type into 2D with the -dim switch.

ogr2ogr -f "ESRI Shapefile" output_2d.shp input_zm.shp -dim 2

The -dim setting is not limited to shapefiles but works in the same way for most vector formats. One exception I know is Oracle Spatial that does not honour the ogr2ogr switch but you must use the layer specific -lco DIM=2instead.

http://gdal.org/ogr2ogr.html

http://www.gdal.org/drv_oci.html

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