Sökning: "height determination"

Visar resultat 1 - 5 av 29 avhandlingar innehållade orden height determination.

  1. 1. Height determination by GPS : A practical experiment in central Sweden

    Författare :Stig-Göran Mårtensson; Högskolan i Gävle; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Division of Geodesy Reports; Surveying; Lantmäteri;

    Sammanfattning : GPS as a height measuring tool has been widely introduced for solving various tasks within the fields of Geodesy and Engineering Surveying. The obvious advantage of not needing lines of sight when acquiring height differences is, however, darkened by the fact that GPS and traditional spirit levelling have fundamentally different reference systems for heights. LÄS MER

  3. 2. Height Determination by GPS - a Practical Experiment in Central Sweden

    Författare :Stig-Göran Mårtensson; KTH; []
    Nyckelord :geoid; GPS levelling; kriging; height determination;

    Sammanfattning : .... LÄS MER

  4. 3. Regional Geoid Determination Methods for the Era of Satellite Gravimetry : Numerical Investigations Using Synthetic Earth Gravity Models

    Författare :Jonas Ågren; Lars E. Sjöberg; Zdenek Martince; KTH; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Earth sciences; geoid determination; GOCE; synthetic earth gravity models; kernel modification; downward continuation; Geovetenskap; Earth sciences; Geovetenskap;

    Sammanfattning : It is the purpose of this thesis to investigate different regional geoid determination methods with respect to their feasibility for use with a future GOCE satellite-only Earth Gravity Model (EGM). This includes investigations of various techniques, which involve different approximations, as well as the expected accuracy. LÄS MER

  5. 4. 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 :NATURVETENSKAP; NATURAL SCIENCES; 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

  7. 5. Geoid determination over Ethiopia with emphasis on downward continuation of gravity anomailes

    Författare :Addisu Hunegnaw; KTH; []
    Nyckelord :geoidal height; modified stokes formula; downward continuation; phillips-tikhonov regularization; wavelet analysis; lateral density variations;

    Sammanfattning : .... LÄS MER