EWKT (Extended WKT)
A PostGIS-style WKT string that can include SRID, like SRID=4326;POLYGON((...)).
Category: Formats · Also known as: Extended Well-Known Text, SRID=...;WKT
Definition (expanded)
EWKT extends WKT by adding an SRID prefix so the database can store CRS metadata with the geometry. EWKT is common in PostGIS and some ETL tools. Standard GeoJSON typically does not carry SRID the same way.
Examples
EWKT with SRID
WKT
SRID=4326;POLYGON((12 55, 12.2 55, 12.2 55.2, 12 55.2, 12 55))
Related terms
WKT (Well-Known Text)A plain-text format for geometries (e.g., POLYGON, MULTIPOLYGON) widely used in GIS and spatial databases.SRIDA numeric identifier for a coordinate reference system used by some databases and formats (especially PostGIS and EWKB).PostGISA spatial extension for PostgreSQL that adds geometry types, indexes, and functions like ST_Intersects and ST_Union.EPSG:4326 (WGS84 lon/lat)A common coordinate reference system using longitude/latitude on WGS84.