Results 131 to 140 of about 742 (185)

Evaluation of geoid height derived by geopotential model and existing regional geoid model

2013 IEEE 9th International Colloquium on Signal Processing and its Applications, 2013
A numerical analysis comparison has been made between derived geoid height from geopotential models and existing regional gravimetric and fitted geoid models. This study is part of an analysis of optimal global geopotential models to determine a seamless precise geoid model.
S. A. H. Sulaiman, K. H. Talib, M. A. M. Wazir, O. M. Yusof   +3 more
openaire   +1 more source

Gravity, Geoids and Heights in the Alaskan Arctic

ISCORD 2013, 2013
The United States and Canada plan to adopt geoid height models as the basis for their respective national vertical datums. Canada is moving forward in 2013 to do this, but the United States will await the completion of the Gravity for the Redefinition of the American Vertical Datum (GRAV-D) project in 2022.
Daniel R. Roman, Xiaopeng Li
openaire   +1 more source

Geoid heights over the Louisville Ridge (South Pacific)

Journal of Geophysical Research: Solid Earth, 1984
Geoid heights over the Louisville Ridge seamount chain, deduced from the Seasat satellite altimeter data, have been analyzed and interpreted. Two uncharted seamounts belonging to the chain have been detected. The elastic thickness of the oceanic lithosphere has been determined along the chain.
Anny Cazenave, Kien Dominh
openaire   +1 more source

The Geoid and Different Height Systems

2014
Theory of the Earth’s shape (theory of the Earth’s gravity field) provides the basis for determining the geodetic datums. The shape of the Earth can be defined in a number of ways. The true shape of the Earth is generally perceived as the natural surface of the Earth, i.e., the continental surface and idealized equilibrium sea and lake surfaces ...
Zhiping Lu, Yunying Qu, Shubo Qiao
openaire   +1 more source

Simplified formulas for geoid height evaluation

Bulletin Géodésique, 1988
A non-conventional treatment of Stokes’integral enables significant simplification of formulas for both the regional and global contributions of the gravity field to the geoidal height.
openaire   +1 more source

Geoid height versus age for symmetric spreading ridges

Journal of Geophysical Research: Solid Earth, 1980
Geoid height‐age relations have been extracted from Geos 3 altimeter data for large areas in the North Atlantic, South Atlantic, southeast Indian, and southeast Pacific oceans. Except for the southeast Pacific area, geoid height decreases approximately linearly with the age of the ocean floor for ages less than about 80 m.y.
David Sandwell, Gerald Schubert
openaire   +1 more source

Adjustment of Collocated GPS, Geoid and Orthometric Height Observations in Greece. Geoid or Orthometric Height Improvement?

2011
The combined adjustment of GPS/Levelling observations on benchmarks with gravimetric geoid heights has been the focus of extensive research both from the theoretical and practical point of view. Up until today, with few exceptions, the main blame for the inconsistencies/disagreement between these three types of heights has been put to the geoid heights
I. N. Tziavos, G. S. Vergos, V. N. Grigoriadis, V. D. Andritsanos   +3 more
openaire   +1 more source

Improving accuracy of local geoid model using machine learning approaches and residuals of GPS/levelling geoid height

Survey Review, 2021
This study aims to use GPS/Levelling data and machine learning techniques (MLs) to model a high precision local geoid for Kuwait.
Mosbeh R. Kaloop, Samui Pijush, Mostafa Rabah, Hamad Al-Ajami, Jong Wan Hu, Ahmed Zaki   +5 more
openaire   +1 more source

Expansion of geoid heights into a spherical harmonic series

Studia Geophysica et Geodaetica, 1982
An algorithm is derived to compute the coefficients of a spherical harmonic series for the geoid radius vector that are a solution to a system of linear equations, containing Stokes' constants of the geopotential.
Karel Pěč, Zdeněk Martinec
openaire   +1 more source