ogr2ogr geojson does not include CRS

[nelson]

When creating geojson via "ogr2ogr -t_srs EPSG:xxxx -f geojson", ogr2ogr correctly reprojects the coordinates to the requested SRS but it does not include the SRS identifer in the output GeoJSON. With no CRS specified, the GeoJSON spec says the default is "the WGS84 datum, and with longitude and latitude units of decimal degrees" which may well be incorrect.

There's code inside ogr2ogr to emit the CRS identifier which was #ifdefed out in December 2011: http://trac.osgeo.org/gdal/changeset/23662

Discussion of the ogr2ogr behavior: ​http://gis.stackexchange.com/questions/46881/ogr2ogr-from-postgres-to-geojson-missing-crs-key

Reference on GeoJSON CRS naming ​http://www.geojson.org/geojson-spec.html#coordinate-reference-system-objects

[Even Rouault]

r25665 "GeoJSON: write crs object as a FeatureCollection attribute in generated GeoJSON files (#4995); on read, strip AXIS nodes"

[nelson]

Thanks!

[martinl]

Replying to rouault:

r25665 "GeoJSON: write crs object as a FeatureCollection attribute in generated GeoJSON files (#4995); on read, strip AXIS nodes"

I am not sure if it's related but if try eg.

ogr2ogr -f GeoJSON -t_srs +init=epsg:3857 -s_srs +init=epsg:5514 test.json /vsicurl/http://geo102.fsv.cvut.cz/~landa/tmp/cfm.shp

The output GeoJSON file doesn't contain any information about SRS... ?

[Even Rouault]

trunk r28491, branches/1.11 r28492 "GeoJSON writer: make string comparison for authority name case insensitive so as to recognize lowercase 'epsg' (#4995)"

As a workaround you can use -t_srs EPSG:3857

Note that the IETF version of GeoJSON will deprecate any use of CRS != longlat WGS84

[martinl]

Replying to rouault:

trunk r28491, branches/1.11 r28492 "GeoJSON writer: make string comparison for authority name case insensitive so as to recognize lowercase 'epsg' (#4995)"

As a workaround you can use -t_srs EPSG:3857

Note that the IETF version of GeoJSON will deprecate any use of CRS != longlat WGS84

Thanks for clarification.