{"$schema":"https://proj.org/schemas/v0.7/projjson.schema.json","type":"CompoundCRS","name":"SVY21 + SHD height","components":[{"type":"GeographicCRS","name":"SVY21","datum":{"type":"GeodeticReferenceFrame","name":"SVY21","ellipsoid":{"name":"WGS 84","semi_major_axis":6378137,"inverse_flattening":298.257223563}},"coordinate_system":{"subtype":"ellipsoidal","axis":[{"name":"Geodetic latitude","abbreviation":"Lat","direction":"north","unit":"degree"},{"name":"Geodetic longitude","abbreviation":"Lon","direction":"east","unit":"degree"}]}},{"type":"VerticalCRS","name":"SHD height","datum":{"type":"VerticalReferenceFrame","name":"Singapore Height Datum"},"coordinate_system":{"subtype":"vertical","axis":[{"name":"Gravity-related height","abbreviation":"H","direction":"up","unit":"metre"}]}}],"scope":"Engineering survey, GIS, topographic mapping.","area":"Singapore - onshore and offshore.","bbox":{"south_latitude":1.13,"west_longitude":103.59,"north_latitude":1.47,"east_longitude":104.07},"id":{"authority":"EPSG","code":6917}}