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ellipsoid_code,ellipsoid_name,semi_major_axis,uom_code,inv_flattening,semi_minor_axis,ellipsoid_shape,remarks,information_source,data_source,revision_date,change_id,deprecated
1024,CGCS2000,6378137,9001,298.257222101,,1,"Defining parameters semi-major axis, flattening and angular velocity are same as for GRS 1980 (ellipsoid code 7019); GM = 3986004.4e8 m*m*m/s/s (from NASA 1986 Lageos determination).",Chinese Academy of Surveying and Mapping.,OGP,2009/11/12,2009.084,0
1025,GSK-2011,6378136.5,9001,298.2564151,,1,,"Parametry Zemli 1990 Reference Document, Military Topgraphic Department (VTU) of the General Staff of Armed Forces of the Russian Federation.",IOGP,2016/01/25,2015.055,0
7001,Airy 1830,6377563.396,9001,299.3249646,,1,"Original definition is a=20923713, b=20853810 feet of 1796. 1/f is given to 7 decimal places. For the 1936 retriangulation OSGB defines the relationship of 10 feet of 1796 to the International metre through ([10^0.48401603]/10) exactly = 0.3048007491...",Ordnance Survey of Great Britain.,OGP,2006/11/27,1998.321 1998.340 2006.932,0
7002,Airy Modified 1849,6377340.189,9001,299.3249646,,1,OSGB Airy 1830 figure (ellipsoid code 7001) rescaled by 0.999965 to best fit the scale of the 19th century primary triangulation of Ireland.,"""The Irish Grid - A Description of the Co-ordinate Reference System"" published by Ordnance Survey of Ireland, Dublin and Ordnance Survey of Northern Ireland, Belfast.",OGP,2003/06/27,1998.321 2002.622,0
7003,Australian National Spheroid,6378160,9001,298.25,,1,Based on the GRS 1967 figure but with 1/f taken to 2 decimal places exactly. The dimensions are also used as the GRS 1967 Modified ellipsoid (see code 7050).,"""Australian Map Grid Technical Manual""; National Mapping Council of Australia Special Publication #7; 1972",OGP,2008/08/11,2002.500 2008.017,0
7004,Bessel 1841,6377397.155,9001,299.1528128,,1,"Original Bessel definition is a=3272077.14 and b=3261139.33 toise. This used a weighted mean of values from several authors but did not account for differences in the length of the various toise: the ""Bessel toise"" is therefore of uncertain length.","US Army Map Service Technical Manual; 1943.",OGP,1999/04/22,1998.321 1998.340,0
7005,Bessel Modified,6377492.018,9001,299.1528128,,1,Used in Norway and also in Sweden with a 1mm increase in semi-major axis.,,OGP,1999/04/22,1998.321,0
7006,Bessel Namibia,6377483.865,9001,299.1528128,,1,a = 6377397.155 German legal metres. This is the same value as the Bessel 1841 figure (code 7004) but in different units. Used in Namibia.,"Chief Directorate: Surveys and Mapping, Mowbray, South Africa.",OGP,1999/04/22,1997.160,1
7007,Clarke 1858,20926348,9005,,20855233,1,"Clarke's 1858/II solution. Derived parameters: a = 6378293.645m using his 1865 ratio of 0.3047972654 feet per metre; 1/f = 294.26068… In Australia and Amoco Trinidad 1/f taken to two decimal places (294.26 exactly); elsewhere a and b used to derive 1/f.","""Ellipsoidisch Parameter der Erdfigur (1800-1950)"" by Georg Strasser.",OGP,2005/08/14,1999.700 2005.370,0
7008,Clarke 1866,6378206.4,9001,,6356583.8,1,Original definition a=20926062 and b=20855121 (British) feet. Uses Clarke's 1865 inch-metre ratio of 39.370432 to obtain metres. (Metric value then converted to US survey feet for use in the US and international feet for use in Cayman Islands).,"US Army Map Service Technical Manual No. 7; 1943.",OGP,2013/01/17,1998.340 2012.095,0
7009,Clarke 1866 Michigan,20926631.531,9003,,20855688.674,1,"Used for Michigan NAD27 State Plane zones. Radius = ellipsoid radius + 800 feet; this approximates the average elevation of the state. Derived parameter: 1/f = 294.97870",USGS Professional Paper #1395.,OGP,1995/06/02,1998.220 2013.020,1
7010,Clarke 1880 (Benoit),6378300.789,9001,,6356566.435,1,Adopts Clarke's values for a and b. Uses Benoit's 1895 ratio of 0.9143992 metres per yard to convert to metres.,,OGP,1995/06/02,,0
7011,Clarke 1880 (IGN),6378249.2,9001,,6356515,1,Adopts Clarke's values for a and b using his 1865 ratio of 39.370432 inches per metre to convert axes to metres.,,OGP,1998/04/16,1998.120,0
7012,Clarke 1880 (RGS),6378249.145,9001,293.465,,1,Adopts Clarke's values for a and 1/f. Adopts his 1865 ratio of 39.370432 inches per metre to convert semi-major axis to metres. Also known as Clarke Modified 1880.,"Empire Survey Review #32; 1939.",OGP,1995/06/02,,0
7013,Clarke 1880 (Arc),6378249.145,9001,293.4663077,,1,Adopts Clarke's value for a with derived 1/f. Uses his 1865 ratio of 39.370432 inch per metre to convert semi-major axis to metres.,"Chief Directorate: Surveys and Mapping, Mowbray, South Africa.",OGP,2001/06/05,2001.052,0
7014,Clarke 1880 (SGA 1922),6378249.2,9001,293.46598,,1,Used in Old French Triangulation (ATF). Uses Clarke's 1865 inch-metre ratio of 39.370432 to convert axes to metres.,,OGP,1995/06/02,,0
7015,Everest 1830 (1937 Adjustment),6377276.345,9001,300.8017,,1,Used for the 1937 readjustment of Indian triangulation. Clarke's 1865 Indian-British foot ratio (0.99999566) and Benoit's 1898 British inch-metre ratio (39.370113) rounded as 0.30479841 exactly and applied to Everest's 1830 definition taken as a and 1/f,"Survey of India professional paper #28; 1939",OGP,1996/10/18,1996.200,0
7016,Everest 1830 (1967 Definition),6377298.556,9001,300.8017,,1,Adopted 1967 for use in East Malaysia. Applies Sears 1922 inch-metre ratio of 39.370147 to Everest 1830 original definition of a and 1/f but with a taken to be in British rather than Indian feet.,,OGP,1995/06/02,,0
7018,Everest 1830 Modified,6377304.063,9001,300.8017,,1,Adopted 1967 for use in West Malaysia. Applies Benoit 1898 inch-metre ratio of 39.370113 to Everest 1830 original definition of a and 1/f but with a taken to be in British rather than Indian feet.,,OGP,1995/06/02,,0
7019,GRS 1980,6378137,9001,298.257222101,,1,"Adopted by IUGG 1979 Canberra. Inverse flattening is derived from geocentric gravitational constant GM = 3986005e8 m*m*m/s/s; dynamic form factor J2 = 108263e-8 and Earth's angular velocity = 7292115e-11 rad/s.","""Geodetic Reference System 1980"" by H. Moritz; Bulletin Geodesique",OGP,2013/08/23,1998.110 1998.320 2013.043,0
7020,Helmert 1906,6378200,9001,298.3,,1,Helmert 1906/III solution.,"""Ellipsoidisch Parameter der Erdfigur (1800-1950)"" by Georg Strasser",OGP,1995/06/02,,0
7021,Indonesian National Spheroid,6378160,9001,298.247,,1,Based on the GRS 1967 figure but with 1/f taken to 3 decimal places exactly.,Rais paper.,OGP,1995/06/02,,0
7022,International 1924,6378388,9001,297,,1,Adopted by IUGG 1924 in Madrid. Based on Hayford 1909/1910 figures. ,,OGP,1995/06/02,,0
7024,Krassowsky 1940,6378245,9001,298.3,,1,,,OGP,1995/06/02,,0
7025,NWL 9D,6378145,9001,298.25,,1,Used by Transit Precise Ephemeris between October 1971 and January 1987.,,OGP,1995/06/02,,0
7027,Plessis 1817,6376523,9001,308.64,,1,Rescaling of Delambre 1810 figure (a=6376985 m) to make meridional arc from equator to pole equal to 10000000 metres exactly. (Ref: Strasser).,"IGN Paris ""Constants d'Ellipsoides"" February 1972.",OGP,1995/06/02,,0
7028,Struve 1860,6378298.3,9001,294.73,,1,"Original definition of semi-major axis given as 3272539 toise. In ""Ellipsoidisch Parameter der Erdfigur (1800-1950)"" , Strasser suggests a conversion factor of 1.94903631 which gives a=6378297.337 metres.","""Geodesia y Cartografia Matematica"" by Fernando Martin Asin; ISBN 84-398-0248-X.",OGP,1998/11/11,1998.070 1998.340,0
7029,War Office,6378300,9001,296,,1,"In non-metric form, a=20926201 Gold Coast feet. DMA Technical Manual 8358.1 and data derived from this quotes value for semi-major axis as 6378300.58m: OGP recommends use of defined value 6378300m exactly.","Tables for the use of the Gold Coast Survey Department, 1935.",OGP,2009/10/29,2009.075,0
7030,WGS 84,6378137,9001,298.257223563,,1,"1/f derived from four defining parameters semi-major axis; C20 = -484.16685*10e-6; earth's angular velocity ? = 7292115e-11 rad/sec; gravitational constant GM = 3986005e8 m*m*m/s/s. In 1994 new GM = 3986004.418e8 m*m*m/s/s but a and 1/f retained.",DMA Technical Manual 8350.2-B,IOGP,2015/11/25,1998.320 2015.047,0
7031,GEM 10C,6378137,9001,298.257223563,,1,Used for GEM 10C Gravity Potential Model.,,OGP,1995/06/02,1998.320,0
7032,OSU86F,6378136.2,9001,298.257223563,,1,Used for OSU86 gravity potential (geoidal) model.,,OGP,1995/06/02,1998.320,0
7033,OSU91A,6378136.3,9001,298.257223563,,1,Used for OSU91 gravity potential (geoidal) model.,,OGP,1995/06/02,1998.320,0
7034,Clarke 1880,20926202,9005,,20854895,1,Clarke gave a and b and also 1/f=293.465 (to 3 decimal places exactly). In the 19th century b was normally given as the second defining parameter.,"""Ellipsoidisch Parameter der Erdfigur (1800-1950)"" by Georg Strasser.",OGP,2008/06/26,2008.057,0
7035,Sphere,6371000,9001,,6371000,0,Authalic sphere. 1/f is infinite. Superseded by GRS 1980 authalic sphere (code 7047).,,OGP,1995/06/02,,1
7036,GRS 1967,6378160,9001,298.247167427,,1,"Adopted by IUGG 1967 Lucerne. 1/f given is derived from geocentric gravitational constant (GM)= 398603e9 m*m*m/s/s; dynamic form factor (J2) = 0.0010827 and Earth's angular velocity w = 7.2921151467e-5 rad/s. See also GRS 1967 Modified (code 7050).","""Geodetic Reference System 1967""; International Association of Geodesy special publication number 3; August 1971.",OGP,2011/02/25,1996.090 1997.252 1998.320 2002.500 2011.016,0
7041,Average Terrestrial System 1977,6378135,9001,298.257,,1,,New Brunswick Geographic Information Corporation land and water information standards manual,OGP,1997/07/22,1998.321,0
7042,Everest (1830 Definition),20922931.8,9080,,20853374.58,1,Everest gave a and b to 2 decimal places and also 1/f=300.8017 (to 4 decimal places exactly). In the 19th century b was normally given as the second defining parameter.,"""Ellipsoidisch Parameter der Erdfigur (1800-1950)"" by Georg Strasser",OGP,2008/06/26,1997.231 2008.057,0
7043,WGS 72,6378135,9001,298.26,,1,,,OGP,1999/04/22,1999.030,0
7044,Everest 1830 (1962 Definition),6377301.243,9001,300.8017255,,1,Used by Pakistan since metrication. Clarke's 1865 Indian foot-British foot ratio (0.99999566) and his 1865 British inch-metre ratio (39.369971) rounded with slight error as 1 Ind ft = 0.3047995m exactly and applied to Everest's 1830 definition of a & b.,,OGP,1999/10/20,,0
7045,Everest 1830 (1975 Definition),6377299.151,9001,300.8017255,,1,Used by India since metrication. Clarke's 1865 Indian foot-British foot ratio (0.99999566) and his 1865 British inch-metre ratio (39.369971) rounded as 1 Ind ft = 0.3047995m exactly applied to Everest's 1830 original definition taken as a and b.,,OGP,1999/10/20,,0
7046,Bessel Namibia (GLM),6377397.155,9031,299.1528128,,1,The semi-major axis has the same value as the Bessel 1841 ellipsoid (code 7004) but is in different units - German Legal Metres rather than International metres - hence a different size. a = 6377483.865 International metres. Used in Namibia.,"Chief Directorate: Surveys and Mapping, Mowbray, South Africa.",OGP,2007/09/21,2007.091,0
7047,GRS 1980 Authalic Sphere,6370997,9001,,6370997,0,"Authalic sphere derived from Clarke 1866 ellipsoid (code 7008). Deprecated as name and parameter values do not match; replaced by 7048.",OGP,OGP,2001/06/05,,1
7048,GRS 1980 Authalic Sphere,6371007,9001,,6371007,0,Authalic sphere derived from GRS 1980 ellipsoid (code 7019). (An authalic sphere is one with a surface area equal to the surface area of the ellipsoid). 1/f is infinite.,OGP,OGP,2001/06/25,,0
7049,IAG 1975,6378140,9001,298.257,,1,,"Chinese Sceience Bulletin, 2009, 54:2714-2721.",OGP,2009/11/24,2009.084,0
7050,GRS 1967 Modified,6378160,9001,298.25,,1,Based on the GRS 1967 figure (code 7036) but with 1/f taken to 2 decimal places exactly. Used with SAD69 and TWD67 datums. The dimensions are also used as the Australian National Spheroid (code 7003).,"""Geodetic Reference System 1967""; International Association of Geodesy special publication number 3; August 1971.",OGP,2008/08/11,2008.017,0
7051,Danish 1876,6377019.27,9001,300,,1,Semi-major axis originally given as 3271883.25 toise. Uses toise to French metre ratio of 1.94903631 to two decimal place precision. An alternative ratio with the German legal metre of 1.9490622 giving 6377104m has not been used in Danish work.,"Kort og Matrikelstyrelsen (KMS), Copenhagen.",OGP,2003/06/27,,0
7052,Clarke 1866 Authalic Sphere,6370997,9001,,6370997,0,Authalic sphere derived from Clarke 1866 ellipsoid (code 7008).,OGP,OGP,2004/04/27,,0
7053,Hough 1960,6378270,9001,297,,1,,DMA / NIMA / NGA TR8350.2,OGP,2006/01/26,,0
7054,PZ-90,6378136,9001,298.257839303,,1,"Earth's angular velocity ? = 7.292115e-5 rad/sec; gravitational constant GM = 3986004.418e8 m*m*m/s/s.","Parametry Zemli 1990 Reference Document, Military Topgraphic Department (VTU) of the General Staff of Armed Forces of the Russian Federation.",IOGP,2016/12/15,2015.055,0
7055,Clarke 1880 (international foot),20926202,9002,,20854895,1,Clark'es 1880 definition in feet assumed for the purposes of metric conversion to be international foot. a = 6378306.370…metres. 1/f derived from a and b = 293.4663077… Used in Fiji.,"Department of Lands and Survey, Fiji.",OGP,2006/07/14,,0
7056,Everest 1830 (RSO 1969),6377295.664,9001,300.8017,,1,Adopted for 1969 metrication of peninsula Malaysia RSO grid. Uses Sears 1922 yard-metre ratio truncated to 6 significant figures applied to Everest 1830 original definition of a and 1/f but with a taken to be in British rather than Indian feet.,Defence Geographic Centre,OGP,2006/07/24,,0
7057,International 1924 Authalic Sphere,6371228,9001,,6371228,0,Authalic sphere derived from International 1924 ellipsoid (code 7022).,OGP,OGP,2006/09/22,,0
7058,Hughes 1980,6378273,9001,,6356889.449,1,Used in US DMSP SSM/I microwave sensor processing software. Semi-minor axis derived from eccentricity=0.081816153. Semi-major axis (a) sometimes given as 3443.992nm which OGP suspects is a derived approximation. OGP conversion assumes 1nm=1852m exactly.,US National Snow and Ice Data Center,OGP,2006/09/22,,0
7059,Popular Visualisation Sphere,6378137,9001,,6378137,0,Sphere with radius equal to the semi-major axis of the GRS80 and WGS 84 ellipsoids. Used only for Web approximate mapping and visualisation. Not recognised by geodetic authorities.,Microsoft.,OGP,2008/03/14,2008.114,1
1 ellipsoid_code ellipsoid_name semi_major_axis uom_code inv_flattening semi_minor_axis ellipsoid_shape remarks information_source data_source revision_date change_id deprecated
2 1024 CGCS2000 6378137 9001 298.257222101 1 Defining parameters semi-major axis, flattening and angular velocity are same as for GRS 1980 (ellipsoid code 7019); GM = 3986004.4e8 m*m*m/s/s (from NASA 1986 Lageos determination). Chinese Academy of Surveying and Mapping. OGP 2009/11/12 2009.084 0
3 1025 GSK-2011 6378136.5 9001 298.2564151 1 Parametry Zemli 1990 Reference Document, Military Topgraphic Department (VTU) of the General Staff of Armed Forces of the Russian Federation. IOGP 2016/01/25 2015.055 0
4 7001 Airy 1830 6377563.396 9001 299.3249646 1 Original definition is a=20923713, b=20853810 feet of 1796. 1/f is given to 7 decimal places. For the 1936 retriangulation OSGB defines the relationship of 10 feet of 1796 to the International metre through ([10^0.48401603]/10) exactly = 0.3048007491... Ordnance Survey of Great Britain. OGP 2006/11/27 1998.321 1998.340 2006.932 0
5 7002 Airy Modified 1849 6377340.189 9001 299.3249646 1 OSGB Airy 1830 figure (ellipsoid code 7001) rescaled by 0.999965 to best fit the scale of the 19th century primary triangulation of Ireland. "The Irish Grid - A Description of the Co-ordinate Reference System" published by Ordnance Survey of Ireland, Dublin and Ordnance Survey of Northern Ireland, Belfast. OGP 2003/06/27 1998.321 2002.622 0
6 7003 Australian National Spheroid 6378160 9001 298.25 1 Based on the GRS 1967 figure but with 1/f taken to 2 decimal places exactly. The dimensions are also used as the GRS 1967 Modified ellipsoid (see code 7050). "Australian Map Grid Technical Manual"; National Mapping Council of Australia Special Publication #7; 1972 OGP 2008/08/11 2002.500 2008.017 0
7 7004 Bessel 1841 6377397.155 9001 299.1528128 1 Original Bessel definition is a=3272077.14 and b=3261139.33 toise. This used a weighted mean of values from several authors but did not account for differences in the length of the various toise: the "Bessel toise" is therefore of uncertain length. US Army Map Service Technical Manual; 1943. OGP 1999/04/22 1998.321 1998.340 0
8 7005 Bessel Modified 6377492.018 9001 299.1528128 1 Used in Norway and also in Sweden with a 1mm increase in semi-major axis. OGP 1999/04/22 1998.321 0
9 7006 Bessel Namibia 6377483.865 9001 299.1528128 1 a = 6377397.155 German legal metres. This is the same value as the Bessel 1841 figure (code 7004) but in different units. Used in Namibia. Chief Directorate: Surveys and Mapping, Mowbray, South Africa. OGP 1999/04/22 1997.160 1
10 7007 Clarke 1858 20926348 9005 20855233 1 Clarke's 1858/II solution. Derived parameters: a = 6378293.645m using his 1865 ratio of 0.3047972654 feet per metre; 1/f = 294.26068… In Australia and Amoco Trinidad 1/f taken to two decimal places (294.26 exactly); elsewhere a and b used to derive 1/f. "Ellipsoidisch Parameter der Erdfigur (1800-1950)" by Georg Strasser. OGP 2005/08/14 1999.700 2005.370 0
11 7008 Clarke 1866 6378206.4 9001 6356583.8 1 Original definition a=20926062 and b=20855121 (British) feet. Uses Clarke's 1865 inch-metre ratio of 39.370432 to obtain metres. (Metric value then converted to US survey feet for use in the US and international feet for use in Cayman Islands). US Army Map Service Technical Manual No. 7; 1943. OGP 2013/01/17 1998.340 2012.095 0
12 7009 Clarke 1866 Michigan 20926631.531 9003 20855688.674 1 Used for Michigan NAD27 State Plane zones. Radius = ellipsoid radius + 800 feet; this approximates the average elevation of the state. Derived parameter: 1/f = 294.97870 USGS Professional Paper #1395. OGP 1995/06/02 1998.220 2013.020 1
13 7010 Clarke 1880 (Benoit) 6378300.789 9001 6356566.435 1 Adopts Clarke's values for a and b. Uses Benoit's 1895 ratio of 0.9143992 metres per yard to convert to metres. OGP 1995/06/02 0
14 7011 Clarke 1880 (IGN) 6378249.2 9001 6356515 1 Adopts Clarke's values for a and b using his 1865 ratio of 39.370432 inches per metre to convert axes to metres. OGP 1998/04/16 1998.120 0
15 7012 Clarke 1880 (RGS) 6378249.145 9001 293.465 1 Adopts Clarke's values for a and 1/f. Adopts his 1865 ratio of 39.370432 inches per metre to convert semi-major axis to metres. Also known as Clarke Modified 1880. Empire Survey Review #32; 1939. OGP 1995/06/02 0
16 7013 Clarke 1880 (Arc) 6378249.145 9001 293.4663077 1 Adopts Clarke's value for a with derived 1/f. Uses his 1865 ratio of 39.370432 inch per metre to convert semi-major axis to metres. Chief Directorate: Surveys and Mapping, Mowbray, South Africa. OGP 2001/06/05 2001.052 0
17 7014 Clarke 1880 (SGA 1922) 6378249.2 9001 293.46598 1 Used in Old French Triangulation (ATF). Uses Clarke's 1865 inch-metre ratio of 39.370432 to convert axes to metres. OGP 1995/06/02 0
18 7015 Everest 1830 (1937 Adjustment) 6377276.345 9001 300.8017 1 Used for the 1937 readjustment of Indian triangulation. Clarke's 1865 Indian-British foot ratio (0.99999566) and Benoit's 1898 British inch-metre ratio (39.370113) rounded as 0.30479841 exactly and applied to Everest's 1830 definition taken as a and 1/f Survey of India professional paper #28; 1939 OGP 1996/10/18 1996.200 0
19 7016 Everest 1830 (1967 Definition) 6377298.556 9001 300.8017 1 Adopted 1967 for use in East Malaysia. Applies Sears 1922 inch-metre ratio of 39.370147 to Everest 1830 original definition of a and 1/f but with a taken to be in British rather than Indian feet. OGP 1995/06/02 0
20 7018 Everest 1830 Modified 6377304.063 9001 300.8017 1 Adopted 1967 for use in West Malaysia. Applies Benoit 1898 inch-metre ratio of 39.370113 to Everest 1830 original definition of a and 1/f but with a taken to be in British rather than Indian feet. OGP 1995/06/02 0
21 7019 GRS 1980 6378137 9001 298.257222101 1 Adopted by IUGG 1979 Canberra. Inverse flattening is derived from geocentric gravitational constant GM = 3986005e8 m*m*m/s/s; dynamic form factor J2 = 108263e-8 and Earth's angular velocity = 7292115e-11 rad/s. "Geodetic Reference System 1980" by H. Moritz; Bulletin Geodesique OGP 2013/08/23 1998.110 1998.320 2013.043 0
22 7020 Helmert 1906 6378200 9001 298.3 1 Helmert 1906/III solution. "Ellipsoidisch Parameter der Erdfigur (1800-1950)" by Georg Strasser OGP 1995/06/02 0
23 7021 Indonesian National Spheroid 6378160 9001 298.247 1 Based on the GRS 1967 figure but with 1/f taken to 3 decimal places exactly. Rais paper. OGP 1995/06/02 0
24 7022 International 1924 6378388 9001 297 1 Adopted by IUGG 1924 in Madrid. Based on Hayford 1909/1910 figures. OGP 1995/06/02 0
25 7024 Krassowsky 1940 6378245 9001 298.3 1 OGP 1995/06/02 0
26 7025 NWL 9D 6378145 9001 298.25 1 Used by Transit Precise Ephemeris between October 1971 and January 1987. OGP 1995/06/02 0
27 7027 Plessis 1817 6376523 9001 308.64 1 Rescaling of Delambre 1810 figure (a=6376985 m) to make meridional arc from equator to pole equal to 10000000 metres exactly. (Ref: Strasser). IGN Paris "Constants d'Ellipsoides" February 1972. OGP 1995/06/02 0
28 7028 Struve 1860 6378298.3 9001 294.73 1 Original definition of semi-major axis given as 3272539 toise. In "Ellipsoidisch Parameter der Erdfigur (1800-1950)" , Strasser suggests a conversion factor of 1.94903631 which gives a=6378297.337 metres. "Geodesia y Cartografia Matematica" by Fernando Martin Asin; ISBN 84-398-0248-X. OGP 1998/11/11 1998.070 1998.340 0
29 7029 War Office 6378300 9001 296 1 In non-metric form, a=20926201 Gold Coast feet. DMA Technical Manual 8358.1 and data derived from this quotes value for semi-major axis as 6378300.58m: OGP recommends use of defined value 6378300m exactly. Tables for the use of the Gold Coast Survey Department, 1935. OGP 2009/10/29 2009.075 0
30 7030 WGS 84 6378137 9001 298.257223563 1 1/f derived from four defining parameters semi-major axis; C20 = -484.16685*10e-6; earth's angular velocity ? = 7292115e-11 rad/sec; gravitational constant GM = 3986005e8 m*m*m/s/s. In 1994 new GM = 3986004.418e8 m*m*m/s/s but a and 1/f retained. DMA Technical Manual 8350.2-B IOGP 2015/11/25 1998.320 2015.047 0
31 7031 GEM 10C 6378137 9001 298.257223563 1 Used for GEM 10C Gravity Potential Model. OGP 1995/06/02 1998.320 0
32 7032 OSU86F 6378136.2 9001 298.257223563 1 Used for OSU86 gravity potential (geoidal) model. OGP 1995/06/02 1998.320 0
33 7033 OSU91A 6378136.3 9001 298.257223563 1 Used for OSU91 gravity potential (geoidal) model. OGP 1995/06/02 1998.320 0
34 7034 Clarke 1880 20926202 9005 20854895 1 Clarke gave a and b and also 1/f=293.465 (to 3 decimal places exactly). In the 19th century b was normally given as the second defining parameter. "Ellipsoidisch Parameter der Erdfigur (1800-1950)" by Georg Strasser. OGP 2008/06/26 2008.057 0
35 7035 Sphere 6371000 9001 6371000 0 Authalic sphere. 1/f is infinite. Superseded by GRS 1980 authalic sphere (code 7047). OGP 1995/06/02 1
36 7036 GRS 1967 6378160 9001 298.247167427 1 Adopted by IUGG 1967 Lucerne. 1/f given is derived from geocentric gravitational constant (GM)= 398603e9 m*m*m/s/s; dynamic form factor (J2) = 0.0010827 and Earth's angular velocity w = 7.2921151467e-5 rad/s. See also GRS 1967 Modified (code 7050). "Geodetic Reference System 1967"; International Association of Geodesy special publication number 3; August 1971. OGP 2011/02/25 1996.090 1997.252 1998.320 2002.500 2011.016 0
37 7041 Average Terrestrial System 1977 6378135 9001 298.257 1 New Brunswick Geographic Information Corporation land and water information standards manual OGP 1997/07/22 1998.321 0
38 7042 Everest (1830 Definition) 20922931.8 9080 20853374.58 1 Everest gave a and b to 2 decimal places and also 1/f=300.8017 (to 4 decimal places exactly). In the 19th century b was normally given as the second defining parameter. "Ellipsoidisch Parameter der Erdfigur (1800-1950)" by Georg Strasser OGP 2008/06/26 1997.231 2008.057 0
39 7043 WGS 72 6378135 9001 298.26 1 OGP 1999/04/22 1999.030 0
40 7044 Everest 1830 (1962 Definition) 6377301.243 9001 300.8017255 1 Used by Pakistan since metrication. Clarke's 1865 Indian foot-British foot ratio (0.99999566) and his 1865 British inch-metre ratio (39.369971) rounded with slight error as 1 Ind ft = 0.3047995m exactly and applied to Everest's 1830 definition of a & b. OGP 1999/10/20 0
41 7045 Everest 1830 (1975 Definition) 6377299.151 9001 300.8017255 1 Used by India since metrication. Clarke's 1865 Indian foot-British foot ratio (0.99999566) and his 1865 British inch-metre ratio (39.369971) rounded as 1 Ind ft = 0.3047995m exactly applied to Everest's 1830 original definition taken as a and b. OGP 1999/10/20 0
42 7046 Bessel Namibia (GLM) 6377397.155 9031 299.1528128 1 The semi-major axis has the same value as the Bessel 1841 ellipsoid (code 7004) but is in different units - German Legal Metres rather than International metres - hence a different size. a = 6377483.865 International metres. Used in Namibia. Chief Directorate: Surveys and Mapping, Mowbray, South Africa. OGP 2007/09/21 2007.091 0
43 7047 GRS 1980 Authalic Sphere 6370997 9001 6370997 0 Authalic sphere derived from Clarke 1866 ellipsoid (code 7008). Deprecated as name and parameter values do not match; replaced by 7048. OGP OGP 2001/06/05 1
44 7048 GRS 1980 Authalic Sphere 6371007 9001 6371007 0 Authalic sphere derived from GRS 1980 ellipsoid (code 7019). (An authalic sphere is one with a surface area equal to the surface area of the ellipsoid). 1/f is infinite. OGP OGP 2001/06/25 0
45 7049 IAG 1975 6378140 9001 298.257 1 Chinese Sceience Bulletin, 2009, 54:2714-2721. OGP 2009/11/24 2009.084 0
46 7050 GRS 1967 Modified 6378160 9001 298.25 1 Based on the GRS 1967 figure (code 7036) but with 1/f taken to 2 decimal places exactly. Used with SAD69 and TWD67 datums. The dimensions are also used as the Australian National Spheroid (code 7003). "Geodetic Reference System 1967"; International Association of Geodesy special publication number 3; August 1971. OGP 2008/08/11 2008.017 0
47 7051 Danish 1876 6377019.27 9001 300 1 Semi-major axis originally given as 3271883.25 toise. Uses toise to French metre ratio of 1.94903631 to two decimal place precision. An alternative ratio with the German legal metre of 1.9490622 giving 6377104m has not been used in Danish work. Kort og Matrikelstyrelsen (KMS), Copenhagen. OGP 2003/06/27 0
48 7052 Clarke 1866 Authalic Sphere 6370997 9001 6370997 0 Authalic sphere derived from Clarke 1866 ellipsoid (code 7008). OGP OGP 2004/04/27 0
49 7053 Hough 1960 6378270 9001 297 1 DMA / NIMA / NGA TR8350.2 OGP 2006/01/26 0
50 7054 PZ-90 6378136 9001 298.257839303 1 Earth's angular velocity ? = 7.292115e-5 rad/sec; gravitational constant GM = 3986004.418e8 m*m*m/s/s. Parametry Zemli 1990 Reference Document, Military Topgraphic Department (VTU) of the General Staff of Armed Forces of the Russian Federation. IOGP 2016/12/15 2015.055 0
51 7055 Clarke 1880 (international foot) 20926202 9002 20854895 1 Clark'es 1880 definition in feet assumed for the purposes of metric conversion to be international foot. a = 6378306.370…metres. 1/f derived from a and b = 293.4663077… Used in Fiji. Department of Lands and Survey, Fiji. OGP 2006/07/14 0
52 7056 Everest 1830 (RSO 1969) 6377295.664 9001 300.8017 1 Adopted for 1969 metrication of peninsula Malaysia RSO grid. Uses Sears 1922 yard-metre ratio truncated to 6 significant figures applied to Everest 1830 original definition of a and 1/f but with a taken to be in British rather than Indian feet. Defence Geographic Centre OGP 2006/07/24 0
53 7057 International 1924 Authalic Sphere 6371228 9001 6371228 0 Authalic sphere derived from International 1924 ellipsoid (code 7022). OGP OGP 2006/09/22 0
54 7058 Hughes 1980 6378273 9001 6356889.449 1 Used in US DMSP SSM/I microwave sensor processing software. Semi-minor axis derived from eccentricity=0.081816153. Semi-major axis (a) sometimes given as 3443.992nm which OGP suspects is a derived approximation. OGP conversion assumes 1nm=1852m exactly. US National Snow and Ice Data Center OGP 2006/09/22 0
55 7059 Popular Visualisation Sphere 6378137 9001 6378137 0 Sphere with radius equal to the semi-major axis of the GRS80 and WGS 84 ellipsoids. Used only for Web approximate mapping and visualisation. Not recognised by geodetic authorities. Microsoft. OGP 2008/03/14 2008.114 1