html_url,issue_url,id,node_id,user,user_label,created_at,updated_at,author_association,body,reactions,issue,issue_label,performed_via_github_app
https://github.com/simonw/sqlite-utils/issues/399#issuecomment-1548913065,https://api.github.com/repos/simonw/sqlite-utils/issues/399,1548913065,IC_kwDOCGYnMM5cUomp,433780,chrislkeller,2023-05-16T03:11:03Z,2023-05-16T03:11:52Z,NONE,"Using this thread and some [other resources](https://sqlite-utils.datasette.io/en/stable/cli.html#spatialite-helpers) I managed to cobble together a couple of sqlite-utils lines to add a geometry column for a table that already has a lat/lng column.

```
# add a geometry column
sqlite-utils add-geometry-column [db name] [table name] geometry --type POINT --srid 4326

# add a point for each row to geometry column
sqlite-utils --load-extension=spatialite [db name] 'update [table name] SET Geometry=MakePoint(longitude, latitude, 4326);'
```","{""total_count"": 1, ""+1"": 1, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",1124731464,"Make it easier to insert geometries, with documentation and maybe code",
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,chris48s,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

- https://datatracker.ietf.org/doc/html/rfc7946#section-4
- https://docs.opengeospatial.org/is/12-007r2/12-007r2.html#1274

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.","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",1124731464,"Make it easier to insert geometries, with documentation and maybe code",