Coordinate systems referencing time open for comment

April 20th, 2018, Published in Articles: PositionIT

The Open Geospatial Consortium (OGC) seeks public comment on the third edition of the Abstract Specification Topic 2: Referencing By Coordinates. This specification describes the requirements for creating coordinate systems referencing locations in space and time.

Aligned with the draft third edition (2018) of ISO 19111 (Spatial Geographic Information – Referencing by coordinates), the abstract specification describes the data elements, relationships and associated metadata required for spatial referencing by coordinates, expanded from a strictly spatial context to include time.

In addition to describing a coordinate reference system, it provides for the description of a coordinate operation between two different coordinate reference systems, or a coordinate operation to account for crustal motion over time. With such information, spatial data referenced to different coordinate reference systems can be referenced to one specified coordinate reference system at one specified time. This facilitates spatial data integration. Alternatively, an audit trail of coordinate manipulations can be maintained.

This third edition cancels and replaces the second edition (OGC Topic 2 of 2008), which has been technically revised. This document also incorporates the provisions of OGC Topic 2.1 of 2010, which is to be cancelled.

OGC Abstract Specifications provide the conceptual foundation for most OGC standards development activities. Open interfaces and protocols are built and referenced against these specifications, which also provide a reference model for the development of OGC Implementation Standards.

The specification is available for comment and review by any interested parties, with comments due by 21 May 2018. Read more at

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