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I'm struggling to use ogr2ogr to convert a GML file into a GeoJSON file. My input is zipped GML files with several layers. I'm only interested in the layer with name 'TopographicArea'.

I've tried converting using the following at the command line:

ogr2ogr -f GeoJSON .\3925845-HW5929.geo.json .\3925845-HW5929.gz

This fails with the error:

ERROR 1: Layer 'TopographicPoint' does not already exist in the output dataset, and cannot be created by the output driver.

I'm presuming this is because GeoJSON doesn't support layers.

How can I tell ogr2ogr to ignore all layers except one?

P.S. I have thousands of GML files to process, so this needs to be scriptable.

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Use the 'layer' option:

ogr2ogr -f GeoJSON .\3925845-HW5929.geo.json .\3925845-HW5929.gz LayerNameHere

Alternatively, if you need more control, you could use a SQL query with the '-sql' option.

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    The syntax is actually ogr2ogr -f GeoJSON .\3925845-HW5929.geo.json .\3925845-HW5929.gz LayerNameHere. You can check what layers exist in the .gz file with ogrinfo .\3925845-HW5929.gz. – user30184 Aug 16 '19 at 15:41
  • Good catch, thanks! – Alex Aug 16 '19 at 15:42

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