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6 Result(s)

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  1. No Access

    Chapter and Conference Paper

    Land Subsidence Monitoring and Analysis in Louisiana Using GNSS Daily Solutions

    Land subsidence affects the vertical control component of the height system in Louisiana at a state-wide level. The National Height Modernization System (NSRS) has been initiated by the National Geodetic Surve...

    Ahmed Abdalla, Rui Fernandes, Machiel Bos… in Selected Studies in Geophysics, Tectonics … (2024)

  2. No Access

    Chapter and Conference Paper

    Improvement of Sudan Gravity Field Using Geopotential and Altimetry Data

    The gravity measurements in Sudan are sparse and few compared to the country area. The currently available measurements were conducted for the sake of mining and oil exploration between the 1970s and mid of 19...

    Ahmed Abdalla in Selected Studies in Geophysics, Tectonics and Petroleum Geosciences (2024)

  3. No Access

    Article

    Analysis of a relative offset between vertical datums at the North and South Islands of New Zealand

    The leveling networks realized by 13 different local vertical datums were jointly readjusted at the South and North Islands of New Zealand. The relation between these two leveling networks and the Word Height ...

    Robert Tenzer, Nadim Dayoub, Ahmed Abdalla in Applied Geomatics (2013)

  4. No Access

    Article

    The global geopotential and regional gravimetric geoid/quasigeoid models testing using the newly adjusted levelling dataset for New Zealand

    The jointly adjusted levelling networks at the South and North Islands of New Zealand (in combination with GPS data) are used to assess the accuracy of the currently available regional gravimetric geoid/quasig...

    Ahmed Abdalla, Robert Tenzer in Applied Geomatics (2012)

  5. No Access

    Article

    Assessment of the LVD offsets for the normal-orthometric heights and different permanent tide systems—a case study of New Zealand

    The geopotential-value approach is utilized in this study to estimate the average offsets of local vertical datums (LVDs) in New Zealand realized in the system of normal-orthometric heights. The LVD offsets ar...

    Robert Tenzer, Viliam Vatrt, Ahmed Abdalla, Nadim Dayoub in Applied Geomatics (2011)

  6. No Access

    Article

    Far-zone gravity field contributions corrected for the effect of topography by means of molodensky’s truncation coefficients

    A spectral representation of the topographic corrections to gravity field quantities is formulated in terms of spherical height functions. When computing the far-zone contributions to the topographic correctio...

    Robert Tenzer, Pavel Novák, Peter Vajda, Artu Ellmann… in Studia Geophysica et Geodaetica (2011)