Results 281 to 290 of about 14,203 (319)
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Local Representation of the Geopotential by Weighted Orthonormal Polynomials
Journal of Guidance and Control, 1979The finite-element model of the geopotential and its gradient as introduced by Junkins, is significantly improved by the use of orthonormal polynomials. The computational effort to obtain the modeling constants via the normal equations is greatly reduced, especially if the order of approximation is increased.
Remi C. Engels, John L. Junkins
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Geopotential resonance in a Landsat orbit
Journal of Geodesy, 1981When the orbit of the Landsat I spacecraft was liberated to natural forces, the loss of observations to the remote sensing community was balanced by a modest gain for geodesy. The orbit’s long ground-track repeat period of eighteen days gives rise to a shallow resonance with fourteenth, twenty-eighth and forty-second order terms in the geopotential.
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Lumped Fifteenth-order Harmonics in the Geopotential [PDF]
Nature Physical Science, 1971 THE orbit of a satellite, moving in the Earth's gravitational field, is perturbed by the various spherical harmonic terms which appear in the general expression for the gravitational potential. The coefficients of the normalized harmonics of degree l and order m are usually denoted by Cl,m and Sl,m and values for some arbitrary set of the Cl,m and Sl,m
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A Geopotential Representation with Sampling Functions
2013Satellite-to-ocean altitudes measured to meter accuracy eventually can yield a geoid representation with significant short-wavelength structure over ocean areas. To cope conveniently with this expected detail, one suggested analytical technique would represent the geopotential or the geoid as an expansion in sampling functions that are linear ...
C. A. Lundquist, G. E. O. Giacaglia
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A new form of representing the geopotential
Bulletin Géodésique, 1976A new procedure is outlined for expanding the potential of a body of irregular structure and shape. The expansion converges in the whole space including interior regions and the surface of the body.
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Comparing different geopotential models in Spain
Marine Geodesy, 1994This work focuses on some currently used high‐degree geopotential models that represent the gravity field in Spain. Six test areas of different topographic structures that cover the greatest part of the territory are selected to get information on the gravity field.
Clara DeLacy +2 more
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Global Point Mascon Models for Simple, Accurate, and Parallel Geopotential Computation
, 2012High-fidelity geopotential calculation using spherical harmonics (SH) is expensive and relies on recursive non-parallel relations. Here, a global point mascon (PMC) model is proposed that is memory light, extremely simple to implement (at any derivative ...
R. Russell, Nitin Arora
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Information measures for global geopotential models
Journal of Geodesy, 1996The survey of the gravity field of the Earth is interpreted as a process of communication. The information inferred from the data is represented in the form of geopotential models. The paper presents a quantitative analysis of this information for spherical harmonic expansions of the potential in terms of information measures, particularly the first
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WEIGHTS FOR GEOPOTENTIAL NUMBERS IN ADJUSTMENT COMPUTATIONS
Survey Review, 1982Abstract This paper is an attempt to justify analytically the assumption that the weights assigned to geopotential numbers can be on the basis of the weights of levelling alone.
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Tailored Reference Geopotential Model for Africa
2015In the framework of the African Geoid Project, the currently available gravity data set contains many significant gaps allover the continent. A possible way to fill in these gaps before the geoid computation process, is to use a global geopotential model which best fits the African gravity field.
Abd-Elmotaal, Hussein A. +3 more
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