Spatial Datatype (geometry) to GeoJSON

Question

I want to convert geom (geometry) datatype to GeoJSON. How could I do that?

For example, the geometry in WKT:

    POLYGON((4552         


        

Answer 1

If you have access to PostgreSQL/PostGIS, you can use ST_GeomFromText to read in the geometry and ST_AsGeoJSON to save the geometry as a GeoJSON:

SELECT ST_AsGeoJSON(ST_GeomFromText('POLYGON((455216.346127297 
 4288433.28426224,455203.386722146 4288427.76317716,455207.791765017
 4288417.51116228,455220.784166744 4288423.30230044,455216.346127297
 4288433.28426224))'));

, which generates:

-------------------------------------------------------------------------------

 {"type":"Polygon","coordinates":[[[455216.346127297,4288433.28426224],
[455203.386722146,4288427.76317716],[455207.791765017,4288417.51116228],
[455220.784166744,4288423.30230044],[455216.346127297,4288433.28426224]]]}

    (1 row)