EPSG Geodetic Parameter Dataset

Version 8.3 - 25 November 2013

Readme file

The EPSG Geodetic Parameter Dataset, or EPSG dataset, is maintained by the Geodesy Subcommittee of the Geomatics Committee of the International Association of Oil & Gas Producers (OGP).

Version 8.3 of the EPSG Geodetic Parameter Dataset comprises of data corrections and updates to the v8.2 release of April 2012.

Contents of this document

Use of the Data

The user assumes the entire risk as to the accuracy and the use of this data. The data may be used, copied and distributed subject to the following conditions:

  1. INFORMATION PROVIDED IN THIS DOCUMENT IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE IMPLIED WARRANTIES OF MERCHANTABILITY AND/OR FITNESS FOR A PARTICULAR PURPOSE.
  2. The data may be included in any commercial package provided that any commerciality is based on value added  by the provider and not on a value ascribed to the EPSG dataset which is made available at no charge. The ownership of the EPSG dataset [OGP] must be acknowledged.
  3. Subsets of information may be extracted from the dataset. Users are advised that coordinate reference system and coordinate transformation descriptions are incomplete unless all elements detailed as essential in OGP Surveying and Positioning Guidance Note 7-1 annex F are included.
  4. Essental elements should preferably be reproduced as described in the dataset. Modification of parameter values is permitted as described in the table below to allow change to the content of the information provided that numeric equivalence is achieved. Numeric equivalence refers to the results of geodetic calculations in which the parameters are used, for example (i) conversion of ellipsoid defining parameters, or (ii) conversion of parameters between one and two standard parallel projection methods, or (iii) conversion of parameters between 7-parameter geocentric transformation methods.

 

As given in EPSG dataset

Permitted change for vendors / users to adopt


Change of ellipsoid defining parameters.

4.1a

Ellipsoid parameters a and b.

a and 1/f ; a and f; a and e; a and e2.

4.1b

Ellipsoid parameters a and 1/f.

a and b; a and f; a and e; a and e2.


Change of projection method

4.2a

Lambert Conic Conformal (1 SP) method with projection parameters φO and kO.

Lambert Conic Conformal (2 SP) method with projection parameters φ1 and φ2.

4.2b

Lambert Conic Conformal (2 SP) method with projection parametersφ1 and φ2.

Lambert Conic Conformal (1 SP) method with projection parameters φO and kO.

4.3a

Mercator (variant A) method with projection parameters φO and kO.

Mercator (variant B) method with projection parameter φ1.

4.3b

Mercator (variant B) method with projection parameter φ1.

Mercator (variant A) method with projection parameters φO and kO.

4.4a

Hotine Oblique Mercator (variant A) method with projection parameters FE and FN.

Hotine Oblique Mercator (variant B) method with projection parameters EC and NC.

4.4b

Hotine Oblique Mercator (variant B) method with projection parameters EC and NC.

Hotine Oblique Mercator (variant A) method with projection parameters FE and FN.

4.5a

Polar Stereographic (Variant A) method with projection parameters φO and kO.

Polar Stereographic (Variant B) method with projection parameter φF.

4.5b

Polar Stereographic (Variant B) method with projection parameter φF.

Polar Stereographic (Variant A) method with projection parameters φO and kO.

4.5c

Polar Stereographic (Variant A) method with projection parameters φO, kO, FE and FN.

Polar Stereographic (Variant C) method with projection parameters φF, EF and NF.

4.5d

Polar Stereographic (Variant C) method with projection parameters φF, EF and NF.

Polar Stereographic (Variant A) method with projection parameters φO, kO, FE and FN.

4.5e

Polar Stereographic (Variant B) method with projection parameter FE and FN.

Polar Stereographic (Variant C) method with projection parameters EF and NF.

4.5f

Polar Stereographic (Variant C) method with projection parameters EF and NF.

Polar Stereographic (Variant B) method with projection parameter FE and FN.


Change of transformation method

4.6a

Position Vector 7-parameter transformation method parameters RX RY and RZ.

Coordinate Frame transformation method with signs of position vector parameters RX RY and RZ reversed.

4.6b

Coordinate Frame transformation method parameters RX RY and RZ.

Position Vector 7-parameter transformation method with signs of coordinate frame parameters RX RY and RZ reversed.

4.7

Concatenated transformation using geocentric methods (Geocentric translations, Position Vector 7-parameter transformation, Coordinate Frame rotation).

Equivalent single geocentric transformation in which for each parameter the parameter values of the component steps have been summed.


Change of units

4.8

NTv2 method grid file filename.

NTv2 method grid file relative storage path with file name including removal (if necessary) of “special characters” [spaces, parentheses, etc] which are replaced by underscore characters.

4.9

Parameter value.

Convert unit to another, for example from microradian to arc-second, using conversion factors obtained from the EPSG dataset Unit table.

 

  1. No data that has been modified other than as permitted in these terms and conditions shall be described as or attributed to the EPSG dataset.

Criteria for inclusion of data

Criteria used for material in the dataset include:

New to version 8.3

Known limitations and/or problems in this version

Known limits and problem areas within this version of the MS Access database data maintenance functions are:

Data Availability

This dataset is available online through the OGP Geodetic Registry service. The registry supports anonymous (guest) access through which users may query and view the data and generate printable reports. It also permits the user to register for additional services, such as the export of the entire EPSG data set as GML 3.2 dictionaries. Additionally the OGP Geodetic Registry supports access through an API, permitting geospatial software to query and retrieve geodetic parameters without human intervention. Details are described in Guidance Note 7 part 3.

It is additionally available for downloading at no charge as an MS Access database or as SQL scripts for loading to another relational database from the EPSG geodetic parameter dataset internet web site at http://www.epsg.org.

Additional information, including detailed Guidance Notes relating to the use of the information in this geodetic parameter dataset is available via the same web site. In particular, Guidance Note 7 part 2 may be useful as it provides formulae and test points for all conversions and transformation methods used in the EPSG dataset.

The parameter listings are "living documents" and will be updated from time to time, usually following meetings in April and October. Comments or suggestions for improvements may be submitted at any time.

The master dataset is available only at this site. Users are discouraged from making the data available on alternate sites, but instead are encouraged to provide hot links to the EPSG site. This will reduce or eliminate the potential problem of users accessing versions of the data that have been superseded.

Previous versions released since February 2002 are available as superseded archived databases. These older databases are not recommended for current use, but are available to users should they need to check data in a prior release, etc.

To be on an electronic mailing list to receive notification of EPSG updates at no charge, select the subscribe option on the web site. This same form may be used to send information about possible errors in the database or to request that new data be added to the EPSG database.

Shipping List

In addition to the online registry, this release of the dataset consists of the following:

Data Structure

See Guidance Note 7 part 1Use of the EPSG Geodetic Parameter Dataset – for a general description, Guidance Note 7 part 3Registry Developer’s Guide – for a specific description of the registry implementation, and Guidance Note 7 part 4Database Developer’s Guide – for a specific description of the Access and SQL relational implementation.

EPSG Codes

The OGP Geodesy Subcommittee has reserved the integer range 0 to 32767 for use as codes. As of dataset version 6.3, the integer range from 6,000,000 to 6,999,999 was also reserved for codes for geographic CRSs in explicitly described degree representations, but this is no longer supported. To prevent conflict with future additions to the EPSG dataset, users who wish to augment the data with their own information should utilise codes greater than 32768.

If users wish to supplement the change table with their own entries, it is important that the user's change notice IDs be above the EPSG integer code limit of 32,767.0. Such an entry in the change table is required for users to deprecate any erroneous user data.

EPSG codes are unique within any particular entity type, but the same value may be used for different entity types (for example CRS and Area). Codes are not reused. See Guidance Note 7 part 1 for further information on coding, deprecation and naming policies.

Future Developments

An interactive GIS front-end has been requested and remains under consideration, subject to availability of resources.

OGP Geodesy Subcommittee

(Send any comments or queries to the entire group by submitting the comment form at www.epsg.org).

Roger Lott (chairman)
OGP, 209-215 Blackfriars Road, London SE1 8NL, United Kingdom


Don Abbey

Woodside Energy Ltd., Woodside Plaza, 240 St Georges Terrace, Perth WA 6000, Australia


Craig Allinson

BP Exploration, Chertsey Road, Sunbury on Thames, Middlesex, TW16 7LN, United Kingdom


Christian Ameil

Total, CSTJF - L1/1041, Avenue Larribau, 64018 Pau, France


Melita Kennedy

ESRI, 380 New York Street, Redlands, CA 92373, U.S.A


Ricardo Lomba
Petrobras, Av. Chile 330 / 11 Andar,  Rio de Janeiro RJ, Brazil


Paul Nolan

RPS Energy, Nelson House, Coombe Lane, Axminster, EX13 5AX, United Kingdom


Roel Nicolai

Shell Exploration and Production, Kesslerpark 1, 2288 GD Rijswijk, Netherlands


Geir Simensen

Statoil, Grenseveien 21, N-4035 Stavanger, Norway


Phil Summerfield

ExxonMobil, 233 Benmar, Houston, TX 77060, U.S.A.

 

©OGP 2013


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