ISO 6709:2022

Overview

ISO 6709:2022 - Standard representation of geographic point location by coordinates specifies how to represent a single geographic point as a text string so that latitude, longitude and optional height or depth (and associated time or other coordinate types) are unambiguously exchangeable between systems. The standard supports both a machine-oriented text string for electronic data exchange and a simpler human-readable text string. It mandates inclusion of a coordinate reference system (CRS) identifier to avoid ambiguity and maintains options for backwards compatibility with ISO 6709:2008.

Key topics and requirements

• Coordinate tuple and components: Defines the structure for latitude, longitude and optional height/depth components and how they are ordered in a tuple.
• CRS identification: Requires an explicit reference system identifier so coordinates reliably map to a specific datum or reference frame.
• Text string formats: Specifies a formal machine-oriented text string suitable for automated interchange and a simpler human-readable format (Clause 6 and Clause 7).
• Formatting rules: Includes rules for angular measures, character delimiters and terminators, and character encodings (Annex F).
• Conformance and testing: Provides conformance rules and an abstract test suite (Annex A).
• Backwards compatibility: Annex B documents representations compatible with ISO 6709:2008 for environments that require legacy support.
• Scope limits: Applies to single-point representations; files containing multiple points sharing a single CRS identifier are out of scope.
• Normative references: Aligns with ISO 19111 (CRS), ISO 19162 (WKT CRS), ISO 8601 (date/time), and ISO/IEC 10646 (character set).

Applications and who uses it

ISO 6709:2022 is practical for any application needing interoperable, unambiguous location exchange:

• GIS and mapping software for storing and exchanging point locations with explicit CRS metadata.
• GNSS and navigation systems ensuring coordinates reference a defined datum.
• Location-based services and APIs that transmit single-point coordinates in a standardized text form.
• Emergency response, surveying and geodesy where precision and clear reference frames matter.
• Developers, data integrators and standards bodies implementing or validating coordinate exchange formats and conformance tests.

Related standards

• ISO 19111 - Geographic information: Referencing by coordinates (CRS definitions)
• ISO 19162 - Well-known text (WKT) representation of CRS
• ISO 8601 - Date and time formats (used when time is associated with coordinates)
• ISO/IEC 10646 - Universal coded character set (character encoding)

ISO 6709:2022 helps reduce ambiguity and conversion costs in geographic data exchange by combining clear coordinate formatting, CRS identification and practical human-readable alternatives. Keywords: ISO 6709, geographic point location, coordinates, CRS, latitude, longitude, height, depth, electronic data exchange, human-readable.