issue_comments: 1030807433

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https://github.com/simonw/sqlite-utils/issues/399#issuecomment-1030807433 https://api.github.com/repos/simonw/sqlite-utils/issues/399 1030807433 IC_kwDOCGYnMM49cN-J 6025893 2022-02-06T10:54:09Z 2022-02-06T10:54:09Z NONE

Interesting that some accept an SRID and others do not - presumably GeomFromGeoJSON() always uses SRID=4326?

The ewtk/ewkb ones don't accept an SRID is because ewkt encodes the SRID in the string, so you would do this with a wkt string:

GeomFromText('POINT(529090 179645)', 27700)

but for ewkt it would be

GeomFromEWKT('SRID=27700;POINT(529090 179645)')

The specs for KML and GeoJSON specify a Coordinate Reference System for the format

GML can specify the SRID in the XML at feature level e.g:

<gml:Point srsName="EPSG:27700"> <gml:coordinates>529090, 179645</gml:coordinates> </gml:Point>

There's a few more obscure formats in there, but broadly I think it is safe to assume an SRID param exists on the function for cases where the SRID is not implied by or specified in the input format.

 
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