TopoLT, ProfLT

The EPSG Geodetic Parameter Dataset (EPSG Dataset) is a repository of parameters required to:

• define a coordinate reference system (CRS) which ensures that coordinates describe position unambiguously.
• define transformations and conversions that allow coordinates to be changed from one CRS to another CRS.

Supplementary information about the signification of the terms and the organization mode of the EPSG database can be found in the Guidance Note Number 7, part 1: Using the EPSG Geodetic Parameter Dataset published by OGP and available for download and viewing at the address www.epsg.org.

From the 6.1 version (july 2001) for the EPSG database has been adopted a new strategy according to which the recordings that contain errors will never be deleted. It has been put into practice by introducing an indicator (deprecated indicator) that can take the values true or false (yes or no) as the respective recording contains or not significant errors. All interrogations made by the TransLT in the EPSG database use a filter that eliminates the recording that have the deprecated field set as yes.