BS ISO 19162:2015 pdf free.Geographic information — Well-known text representation of coordinate reference systems.
BS ISO 19162 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.
2 Conformance requirements
This International Standard defines eleven classes of conformance (see Annex A) in three groups:
1) Any WKT string claiming conformance of coordinate reference system definition shall satisfy the requirements in Annex A as shown in Table 1.
2) Any WKT string claiming conformance of coordinate operation definition shall satisfy the requirements given in A.10.
3) Any WKT string claiming conformance of coordinate transformation bound to a coordinate reference system definition shall satisfy the requirements given in A.1 1.
Conformance is applicable to the WKT string. Recommended practices for implementations writing or reading coordinate reference system WKT strings are given in Annex B.
3 Normative references
The following documents, in whole or in part. are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 8601:2004. Data elements and interchange formats — Information interchange — Representation of dates and times
ISO/IEC 9075-1:2011, Information technology — Database languages — SQL — Part 1: Framework (SQLJFra me work)
ISO/IEC 9075-2:2011, In formation technology — Database languages — SQL — Part 2: Foundation (SQL/Foundation)
ISO/IEC 10646:2012, Information technology — Universal Coded Character Set (tiCS)
ISO 19111:2007, Geographic in formation — Spatial referencing by coordinates
ISO 19111-2:2009, Geographic information — Spatial referencing by coordinates — Part 2: Extension for
parametric values
4 Definitions and abbreviations
4.1 Definitions
For the purposes of this document, the following terms and definitions apply.BS ISO 19162 pdf free download.
Tags: Geographic information
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