The OGC requests comment on the candidate Geographic Information - Well Known Text for coordinate reference systems standard

Please note: This call is now closed.
Closing Date: 
Friday, 1 November 2013 04:00 UTC

The Open Geospatial Consortium (OGC®) is seeking comments on the candidate OGC standard, "Geographic Information – Well Known Text (WKT) for coordinate reference systems."

OGC Well Known Text offers a compact machine-readable and human-readable representation of geometric objects. WKT can also be used for succinctly describing the critical elements of coordinate reference system (CRS) definitions. 

WKT is described in the OGC standard “Geographic information – Simple feature access – Part 1: Common architecture” (also International Standard ISO 19125-1:2004). The WKT representation of coordinate reference systems was subsequently extended in other OGC standards. As a result, there are inconsistencies in how WKT CRS is expressed in various OGC and ISO standards.

This draft standard provides an updated version of WKT representation of coordinate reference systems that follows the provisions of OGC Abstract Specification Topic 2 (ISO 19111:2007) Spatial Referencing by Coordinates. The draft extends earlier WKT to allow for the description of coordinate transformations. This draft standard defines the structure and content of well known text strings. It does not prescribe how implementations should read or write these strings.

Comments are due by 1 November 2013, but we encourage those interested to comment by 26th October. This draft has been submitted by the OGC to ISO TC211 as a Committee Draft for ballot as a Draft International Standard (document N3596). Comments received as part of the OGC RFC by 26th October will be fed into the ISO ballot. 

All OGC standards are free and publicly available. Download the candidate OGC WKT CRS draft standard below:


Comments can be submitted to a dedicated email reflector for a thirty day period ending on the "Close request date" listed above, Comments received will be consolidated and reviewed by OGC members for incorporation into the document. Please submit your comments using the following link: Click here to submit comments The link provided above should include a standard template in the message body. If the preloaded message body does not work properly using your mail client, please refer to the following template for the message body: Comments Template


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