# this file contains ellipsoid parameters # format of the file is # name "description" a=value x=value # # where name is a single word elliposid name, # description is a text enclosed in double quotes, # a is the equatorial radius # and x is one of # b polar radius, f flattening, or e eccentricity squared # # x should be a defining parameter (as opposed to a derived parameter) # note: accuracy should be sufficient with a derived parameter. # All newer sources state only f as a parameter, even if it is derived. # b / a = 1 - f = sqrt( 1 - e2 ) = 1 / sqrt ( 1 + e'2 ) # # no spaces before or after the = # PLEASE ALWAYS ADD NEW DEFINITIONS TO THE END OF THE FILE AND INCLUDE # A COMMENT DESCRIBING THE SOURCE OF THE DEFINITION # the following parameters are from NIMA document TR8350.2: # old values commented # Airy 1830 # airy a=6377563.396 e=.006670540 airy "Airy 1830" a=6377563.396 f=1/299.3249646 # Australian National australian "Australian National" a=6378160.000 f=1/298.25 # Bessel 1841, Ethiopia, Indonesia, Japan and Korea # bessel a=6377397.155 e=.006674372 bessel "Bessel 1841" a=6377397.155 f=1/299.1528128 # Bessel 1841, Namibia bess_nam "Bessel 1841, Namibia" a=6377483.865 f=1/299.1528128 # Clarke 1866 # clark66 a=6378206.4 b=6356583.8 clark66 "Clarke 1866" a=6378206.400 f=1/294.9786982 # Clarke 1880 clark80 "Clarke 1880" a=6378249.145 f=1/293.465 # Everest 1830, India # everest a=6377276.345 e=.0066378466 everest "Everest 1830, India" a=6377276.345 f=1/300.8017 evrst30 "Everest 1830, India" a=6377276.345 f=1/300.8017 # Everest 1948, W. Malaysia and Singapore evrst48 "Everest 1948" a=6377304.063 f=1/300.8017 # Everest 1956, India evrst56 "Everest 1956, India" a=6377301.243 f=1/300.8017 # Everest 1969, W. Malaysia evrst69 "Everest 1969, W. Malaysia" a=6377295.664 f=1/300.8017 # Everest (Sabah & Sarawak), Brunei and E. Malaysia evrstss "Everest Sabah and Sarawak" a=6377298.556 f=1/300.8017 # Helmert 1906 helmert "Helmert 1906" a=6378200.000 f=1/298.3 # Hough 1960 # hough a=6378270.0 b=6356794.343479 hough "Hough 1960" a=6378270.000 f=1/297.0 # Indonesian 1974 indonesian "Indonesian 1974" a=6378160.000 f=1/298.247 # International 1924 international "International 1924" a=6378388.000 f=1/297.0 # Krassovsky 1940 krassovsky "Krassovsky 1940" a=6378245.000 f=1/298.3 # Airy 1830 Modified # modif_airy a=6377340.189 b=6356036.143 modif_airy "Airy 1830 Modified" a=6377340.189 f=1/299.3249646 # South American 1969 sam69 "South American 1969" a=6378160.000 f=1/298.25 # Brazil South American 1969 SAD-69 "Please use sam69 instead" a=6378160.000 f=1/298.25 # WGS 1972 wgs72 "World Geodetic System 1972" a=6378135.000 f=1/298.26 # WGS84 as defined by NIMA document TR8350.2 wgs84 "World Geodetic System 1984" a=6378137.000 f=1/298.257223563 # Geodetic Reference System 1980 (IUGG, 1980) grs80 "Geodetic Reference System 1980" a=6378137.000 f=1/298.257222101 # from original file: # GRS75 grs75 "GRS75" a=6378140.000 b=6356755.288 # Hayford (same as International 1909) hayford "Hayford" a=6378388.000 f=1/297.000 # additional ellipsoids from PROJ4.4.1, file pj_ellps.c # Appl. Physics. 1965 apl4.9 "Appl. Phys. 1965" a=6378137.0 f=1/298.25 # Australian Natl & S. Amer. 1969 aust_sa "Australian Natl & S. Amer. 1969" a=6378160.000 f=1/298.25 # Andrae 1876 (Den., Iclnd.) andrae "Andrae 1876" a=6377104.43 f=1/300.0 # Comm. des Poids et Mesures 1799 cpm "Comm. des Poids et Mesures 1799" a=6375738.7 f=1/334.29 # Delambre 1810 (Belgium) delmbr "Delambre 1810" a=6376428.0 f=1/311.5 # Engelis 1985 engelis "Engelis 1985" a=6378136.05 f=1/298.2566 # Fischer (Mercury Datum) 1960 fschr60 "Fischer (Mercury Datum) 1960" a=6378166.000 f=1/298.3 # Mercury (same as Fischer 1960). Included only for reference. # mercury "Mercury" a=6378166.0 b=6356784.283666 # modif_merc is a synonym to Modified Fischer 1960 (fschr60m). Included only for reference. # modif_merc "Modified Mercury" a=6378150.0 b=6356768.337303 # Modified Fischer 1960 fschr60m "Modified Fischer 1960" a=6378155.000 f=1/298.30 # Fischer 1968 fschr68 "Fischer 1968" a=6378150.000 f=1/298.3 # GRS 67 (IUGG 1967) # GRS67 a=6378160.000 b=6356774.516 grs67 "GRS67" a=6378160.000 f=1/298.2471674270 # IAU 1976 iau76 "IAU 1976" a=6378140.000 f=1/298.257 # International 1909 (Hayford) intl "International 1909 (Hayford)" a=6378388.000 f=1/297.000 # Kaula 1961 kaula "Kaula 1961" a=6378163.0 f=1/298.24 # Lerch 1976 lerch "Lerch 1976" a=6378139.0 f=1/298.257 # Maupertius 1738 mprts "Maupertius 1738" a=6397300.0 f=1/191.0 # MERIT 1983 merit "MERIT 1983" a=6378137.000 f=1/298.257 # New International 1967 new_intl "New International 1967" a=6378157.500 b=6356772.2 # This has same values as as WGS66 # Naval Weapons Lab., 1965 nwl9d "Naval Weapons Lab., 1965" a=6378145.000 f=1/298.25 # Plessis 1817 (France) plessis "Plessis 1817" a=6376523.0 b=6355863.0 # Southeast Asia seasia "South East Asia" a=6378155.000 b=6356773.3205 # Soviet Geodetic System 85 sgs85 "Soviet Geodetic System 1985" a=6378136.000 f=1/298.257 # Walbeck walbeck "Walbeck" a=6376896.000 b=6355834.8467 # WGS60 wgs60 "WGS60" a=6378165.000 f=1/298.3 # WGS66 wgs66 "WGS66" a=6378145.000 f=1/298.25 # Modified Everest (from elist.html from Peter H. Dana, cited from DMA 1987 # everest_m "Modified Everest" a=6377304.063 b=6356103.039 everest_m "Modified Everest" a=6377304.063 f=1/300.8017 # new from ? # Everest (Pakistan) everest_p "Everest (Pakistan)" a=6377309.613 f=1/300.8017 # earth as a sphere: sphere "Spherical Earth" a=6370997.000 e=0.0 # Bessel modified (Norway) http://crs.ifag.de/ modif_bessel "Bessel Modified (Norway)" a=6377492.0176 f=1/299.15281285 # Clarke 1880 IGN France http://grass.itc.it/pipermail/grass5/2005-November/020361.html clark80IGN "Clarke 1880 IGN France" a=6378249.200 f=1/293.466021294