Guidance Notes

EPSG Dataset Supporting Documentation

Using the EPSG Geodetic Parameter Dataset (Guidance Note 7-1)

This document gives detailed information about the Dataset contents and its maintenance. New updated version of the Guidance Note will be available soon.

Coordinate Conversions and Transformations including Formulas (Guidance Note 7-2)

This document provides the formulas for executing coordinate conversions and coordinate transformations using the coordinate operation methods supported in the EPSG dataset. Geodetic parameters in the Dataset are consistent with these formulas.

EPSG Registry API User Guide (Guidance Note 7-3)

This document provides assistance  to computer application developers who wish to use the RESTful API of the EPSG Registry to query and retrieve entities and attributes from the Dataset. 

EPSG Geodetic Parameter Relational Database – Developers Guide (Guidance Note 7-4)

This document is intended to assist computer application developers in using the EPSG geodetic parameter relational database and SQL scripts. It may also be useful to other users of the data. Readers are recommended to have read Part 1 of the guidance note before this part. New updated version of the Guidance Note will be available soon.

EPSG null and copy transformations to WGS 84 (Guidance Note 7-5)

This document explains aspects of the past and current policy for the inclusion in the EPSG Dataset of so-called null coordinate transformations to WGS 84 and limitations in the description of WGS 84 through coordinate reference system code EPSG:4326. It also describes the application of datum ensembles in the EPSG Dataset. It recommends appropriate usage of this data. The Guidance Note is aimed at application developers, data managers, operational surveyors and (GIS) end-users requiring positioning accuracy of approximately 1-3m or better.

Geomatics Guidance Notes

For all IOGP's Geomatics Committee reports, please go to IOGP Bookstore.

Download:

Note:

1. Parts 7-1 and 7-4 of the series support the old data model. New updated version of these Guidance Notes will be available soon.
2. Part 7-3 is no longer available.
3. Part 7-2 is is not impacted by data model changes.

For an overview to the model changes see here.

News from Geodesy Subcommittee
Dynamic Coordinate Reference Systems

Following the release of updated GN25 Dynamic versus static CRSs and use of the ITRF and new GN26 Coordinate Transformations in the US Gulf of Mexico OCS, the Geomatics Committee has now delivered 
a video introducing the concept of dynamic coordinate reference systems. 

The video is shared under the same T&C as other IOGP Publications and can be reproduced in whole or in part provided (i) that the copyright of IOGP and (ii) the sources are acknowledged.