Sökning: "hybrid geoid"

Hittade 2 avhandlingar innehållade orden hybrid geoid.

  1. 1. Geoid Model of Tanzania from Sparse and Varying Gravity Data Density by the KTH method

    Författare :Prosper Ulotu; Lars Sjöberg; Hossein Nahavandchi; KTH; []
    Nyckelord :NATURAL SCIENCES; NATURVETENSKAP; Geoid; sparse gravity data; gravity database; GGM validation by gravity; corrector surface; hybrid geoid; KTH-LSMS with AC; Mt. Kilimanjaro; Tanzania.; Earth sciences; Geovetenskap;

    Sammanfattning : Developed countries are striving to achieve a cm geoid model. Most developing countries/regions think that the situation in their areas does not allow even a few decimetre geoid model. GNSS, which provides us with position, is one of the greatest achievements of the present time. LÄS MER

  2. 2. Precise Gravimetric Geoid Model for Iran Based on GRACE and SRTM Data and the Least-Squares Modification of Stokes’ Formula : with Some Geodynamic Interpretations

    Författare :Ramin Kiamehr; Lars Sjöberg; Martin Vermeer; KTH; []
    Nyckelord :NATURAL SCIENCES; NATURVETENSKAP; Gravity database; least-squares modification of Stokes; geoid determination; SRTM; GRACE; GPS levelling; density variation model; height datum; geodynamics; Iran; Earth sciences; Geovetenskap;

    Sammanfattning : Iran is one of the most complicated areas in the world from the view of rough topography, tectonic activity, large lateral density and geoidal height variations. The computation of a regional gravimetric geoid model with high accuracy in mountainous regions, especially with sparse data, is a difficult task that needs a special attention to obtain reliable results which can meet the needs of the today geodetic community. LÄS MER