Ian
---------- Forwarded message ----------
From: Carl Reed OGC Account <[EMAIL PROTECTED]>
Date: Feb 28, 2006 3:37 PM
Subject: Re: [Tc] EPSG Update announcement - new version and name change
To: Technical Committee <[EMAIL PROTECTED]>
EPSG
geodetic parameter dataset v6.9 release
Version
6.9 of the EPSG geodetic parameter dataset has been released and may be
downloaded without charge from
www.epsg.org
.
This release contains a number of additions to data in the previous v6.8
(October 2005) release, as well as the following:
- Changes as documented in Change table records through 2006.19, but with actions still remaining on some earlier change requests.
- Transformations published by the US National Geospatial Intelligence Agency (NGA) for oceanic islands not previously included in the EPSG dataset, together with datums and coordinate reference systems upon which these transformations are dependent, have now been included.
- Transformation accuracy field entries for NGA and certain other transformations have been revised.
- Area table records for maritime countries based on ISO 3166 have had their area of use clarified to cover the whole country, both onshore and offshore. Where appropriate separate country and sub-country onshore records have been added to the area table, with some datum, coordinate reference system and coordinate operation records amended to refer to these records rather than the ISO country record.
The
geographic bounding box and transformation accuracy data were added in prior
version 6.8 to assist the selection of transformation variant. Between any pair
of coordinate reference systems, many transformations may exist. The primary criteria for
determining which, if any, of the variants is most appropriate for use is given
in text comment within the Scope, Area of Use, and Remarks fields. These
free-form text fields are difficult for computer software to analyze. The
geographic bounding box values may be used to exclude variants from
consideration. The transformation accuracy values may be used to rank variants.
Further comment on using these data is given in
Guidance Note 7 part
1 – Use of the EPSG Geodetic Parameter
Dataset.
As in previous
releases the v6.9 dataset is available in two forms: either an MS Access
database which also includes a data reporting capability, or as a series of SQL
scripts for populating an alternative relational database application.
The former European Petroleum Survey Group (EPSG) has been
reformed as the Surveying and Positioning Committee of the International
Association of Oil and Gas Producers (OGP). Similarly, the former EPSG Geodesy
Working Group is now the Geodesy Subcommittee of the OGP Surveying and
Positioning Committee. This Geodesy Subcommittee continues with the same members
as the previous EPSG Geodesy Working Group. This OGP Geodesy Subcommittee will
continue to maintain the EPSG dataset. The dataset will continue to be known as
the EPSG (geodetic parameter) dataset.
If you have received this message
in error or wish to be removed from the distribution list of the infrequent EPSG
/ OGP Geodesy Subcommittee subscriber notices, please response to j[EMAIL PROTECTED]
with
subject "UNSUBSCRIBE".
Best regards,
Jim Cain, member,
Geodesy Subcommittee of the OGP Surveying and Positioning
Committee
Houston, TX
77077-3910
USA
Tel: +1 (281)-558-6153, Mob: +1
(832)-215-5551, Fax: +1 (281)-556-1084
Preferred EPSG / OGP incoming
email address: j[EMAIL PROTECTED]
CTO and Executive Director Specification Program
OGC
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--
Ian Turton
http://www.geotools.org
http://pennspace.blogspot.com/
