Well-known text representation of coordinate reference systems

This Standard defines the structure and content of well-known text strings describing coordinate reference systems (CRSs) and coordinate operations between coordinate reference systems. It does not prescribe how implementations should read or write these strings.

This Standard provides an updated version of WKT representation of coordinate reference systems that follows the provisions of ISO 19111:2019 including its amendments 1 and 2. It extends the WKT in OGC document 12-063r5 (ISO 19162) which was based on ISO 19111:2007 and ISO 19111-2:2009. That version consolidated several disparate versions of earlier WKT (so-called WKT1) and added the description of coordinate operations.