Coordinate Reference Systems

The DNF register of Coordinate Reference Systems is intended to give an overview of all the common spatial reference systems in use in the UK. The defining parameters for each will be published.

CRS Code
OSGB 1936 View parameters
ETRS89 View parameters
TM75 View parameters
OSNI 1952 View parameters
IRENET 95 View parameters
WGS84 View parameters


British National Grid (OSGB 1936)

CS_NAME OSGB 1936 / British National Grid
SRID 27700
AUTH_NAME Ordnance Survey
Coordinate System Type Projected
Datum OSGB 1936 (EPSG ID 6277)
Spheroid Airy 1830 (EPSG ID 7001)
Semi-Major Axis 6377563.396
Semi-Minor Axis 299.324964600
Prime Meridian Greenwich
PM Units Decimal Degree, 0.01745329251994328
Projection British National Grid (EPSG OP 19916)
Latitude of Origin 49
Central Meridian -2
Scale Factor 0.9996012717
False Easting 400000
False Northing -100000
E/N Units Meter, 1
Geocentric X Translation 446.44800
Geocentric Y Translation -125.15700
Geocentric Z Translation 542.06000
Rotation X-Axis 0.15020
Rotation Y-Axis 0.24700
Rotation Z-Axis 0.84210
Correction of Scale 0.9999795106


European Terrestrial Reference System 1989 (ETRS89)

CS_NAME ETRS89
SRID 4258
AUTH_NAME EPSG. See 3D CRS for original information source.
Coordinate System Type Geographic
Datum European Terrestrial Reference System 1989 (EPSG ID 6258)
Spheroid GRS 1980 (EPSG ID 7019)
Semi-Major Axis 6378137.000
Semi-Minor Axis 298.257222101
Prime Meridian Greenwich
PM Units Decimal Degree, 0.01745329251994328


Irish Grid (TM75)

CS_NAME TM75 / Irish Grid
SRID 29903
AUTH_NAME Ordnance Survey of Ireland
Coordinate System Type Projected
Datum Geodetic Datum of 1965 (EPSG ID 6300)
Spheroid Airy Modified 1849 (EPSG ID 7002)
Semi-Major Axis 6377340.189
Semi-Minor Axis 299.324964600
Prime Meridian Greenwich
PM Units Decimal Degree, 0.01745329251994328
Projection Irish Grid (EPSG OP 19972)
Latitude of Origin 53.5
Central Meridian -8
Scale Factor 1.0000350000
False Easting 200000
False Northing 250000
E/N Units Meter, 1
Geocentric X Translation 482.50000
Geocentric Y Translation -130.60000
Geocentric Z Translation 564.60000
Rotation X-Axis -1.04200
Rotation Y-Axis -0.21400
Rotation Z-Axis -0.63100
Correction of Scale 0.99999185


Irish National Grid (OSNI 1952)

CS_NAME OSNI 1952 / Irish National Grid
SRID 29901
AUTH_NAME Ordnance Survey of Northern Ireland.
Coordinate System Type Projected
Datum OSNI 1952 (EPSG ID 6188)
Spheroid Airy 1830 (EPSG ID 7001)
Semi-Major Axis 6377563.396
Semi-Minor Axis 299.324964600
Prime Meridian Greenwich
PM Units Decimal Degree, 0.01745329251994328
Projection Irish National Grid (EPSG OP 19973)
Latitude of Origin 53.5
Central Meridian -8
Scale Factor 1.0000000000
False Easting 200000
False Northing 250000
E/N Units Meter, 1
Geocentric X Translation 482.50000
Geocentric Y Translation -130.60000
Geocentric Z Translation 564.60000
Rotation X-Axis -1.04200
Rotation Y-Axis -0.21400
Rotation Z-Axis -0.63100
Correction of Scale 0.99999185


Irish Transverse Mercator (IRENET 95)

CS_NAME IRENET95 / Irish Transverse Mercator
SRID 2157
AUTH_NAME Ordnance Survey of Ireland
Coordinate System Type Projected
Datum IRENET95 (EPSG ID 6173)
Spheroid GRS 1980 (EPSG ID 7019)
Semi-Major Axis 6378137.000
Semi-Minor Axis 298.257222101
Prime Meridian Greenwich
PM Units Decimal Degree, 0.01745329251994328
Projection Irish Transverse Mercator (EPSG OP 19962)
Latitude of Origin 53.5
Central Meridian -8
Scale Factor 0.9998200000
False Easting 600000
False Northing 750000
E/N Units Meter, 1
Geocentric X Translation  
Geocentric Y Translation  
Geocentric Z Translation  
Rotation X-Axis  
Rotation Y-Axis  
Rotation Z-Axis  
Correction of Scale  


World Geodetic System 1984 (WGS84)

CS_NAME WGS 84
SRID 4326
AUTH_NAME EPSG. See 3D CRS for original information source.
Coordinate System Type Geographic
Datum World Geodetic System 1984 (EPSG ID 6326)
Spheroid WGS 84 (EPSG ID 7030)
Semi-Major Axis 6378137.000
Semi-Minor Axis 298.257223563
Prime Meridian Greenwich
PM Units Decimal Degree, 0.01745329251994328


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