ISO 19162:2015

Foreword
Introduction
1 Scope
2 Conformance requirements
3 Normative references
4 Definitions and abbreviations
5 Backus-Naur Form notation and syntax
6 WKT string form
7 WKT representation of common attributes
8 WKT representation of geodetic coordinate
   reference systems
9 WKT representation of projected CRS[s]
10 WKT representation of vertical CRS[s]
11 WKT representation of engineering CRS[s]
12 WKT representation of image CRS[s]
13 WKT representation of parametric CRS[s]
14 WKT representation of temporal CRS[s]
15 WKT representation of derived CRS[s]
16 WKT representation of compound coordinate
   reference systems
17 WKT representation of coordinate operations
18 WKT representation of CRS and coordinate operation
   couplets
Annex A (normative) - Abstract test suite
Annex B (informative) - Recommended practice for
        implementation
Annex C (informative) - Mapping of concepts from
        previous versions of CRS WKT
Annex D (informative) - Triaxial ellipsoid
Annex E (informative) - Identifiers for coordinate
        operation methods and parameters
Bibliography

ISO 19162:2015 defines the structure and content of a text string implementation of the abstract model for coordinate reference systems described in ISO 19111:2007 and ISO 19111-2:2009. The string defines frequently needed types of coordinate reference systems and coordinate operations in a self-contained form that is easily readable by machines and by humans. The essence is its simplicity; as a consequence there are some constraints upon the more open content allowed in ISO 19111:2007. To retain simplicity in the well-known text (WKT) description of coordinate reference systems and coordinate operations, the scope of this International Standard excludes parameter grouping and pass-through coordinate operations. The text string provides a means for humans and machines to correctly and unambiguously interpret and utilise a coordinate reference system definition with look-ups or cross references only to define coordinate operation mathematics. Because it omits metadata about the source of the data and may omit metadata about the applicability of the information, the WKT string is not suitable for the storage of definitions of coordinate reference systems or coordinate operations.