I think it is used for recognising the density of different parts of the earth....
Geodesy measures the various positions and points on the Earth.
the father of Geodesy & Indology is abu rayhan al biruni
Space geodetic methods were brought to geodesy in the 20th century.
W. Baarda has written: 'Linking up spatial models in geodesy extended S-transformations' -- subject(s): Mathematics, Transformations (Mathematics), Geodesy, Nets (Geodesy)
Reino Antero Hirvonen has written: 'Matemaattinen geodesia' -- subject(s): Mathematics, Geodesy 'Adjustment by least squares in geodesy and photogrammetry' -- subject(s): Photogrammetry, Least squares, Geodesy
Geodesy.
Cartography or Geodesy .
Thomas Jefferson Lee has written: 'Tables and formulae useful in surveying, geodesy, and practical astronomy' -- subject(s): Tables, Astronomy, Geodesy, Surveying
J. W. Ryan has written: 'NASA Space Geodesy Program--GSFC data analysis--1992' -- subject(s): Crust, Rotation, Satellite geodesy
Ronald S. Mather has written: 'Communications from Australia to Section V, International Association of Geodesy, XV General Assembly, International Union of Geodesy & Geophysics, Moscow, 1971' -- subject(s): Congresses, Geodesy, Gravity 'The analysis of the earth's gravity field' -- subject(s): Gravity, Mathematics
Walter F. Reynolds has written: 'Triangulation in Maine' -- subject(s): Triangulation, Geodesy 'First-order triangulation in southeast Alaska' -- subject(s): Triangulation, Geodesy
Martin Hotine has written: 'Mathematical geodesy'