2 edition of indirect effects on the computation of geoid undulations. found in the catalog.
indirect effects on the computation of geoid undulations.
by Ohio State University, Department of Geodetic Science and Surveying in Columbus, Ohio
Written in English
|Series||Reports / Department of Geodetic Science and Surveying, Ohio State University -- no.336|
|The Physical Object|
|Pagination||iv, 95p. :|
|Number of Pages||95|
Geoid undulations from satellite Doppler stations have been compared to geoid undulations computed using three procedures. The first procedure combines potential coefficients with uncorrected 1°×1° Cited by: 7. We developed a refined gravimetric geoid model for Japan on a 1 × arc-minute (2 km) grid from a GOCE-based satellite-only global geopotential model and a regional gravity field model updated in this study. First, we have constructed a regional gravity field model for Japan using updated gravity datasets together with a residual terrain model: , land gravity data, 77, shipborne.
Compute the geoid by adding the Geoid Indirect Effect (GIE) and add the GM contribution. The interested reader can refer to Sideris () for thorough analysis of this methodology. Although the planar approximation was used in Sideris (), the main methodology is the by: 6. The indirect effect on gravity (or secondary indirect effect) is not considered in most of the cases because it has small values and its effect is only a few centimetres on the gravimetric geoid. Nevertheless, in this study, the secondary indirect effect has been included to attain a gravimetric geoid with the highest precision by:
A new geoid computed with high-resolution for Italy, is presented in this paper. The computation of this gravimetric geoid is based on the most recent geopotential model: EGM (Earth Gravity Model released in ). The method used in the computation of this new gravimetric geoid has been the Stokes integral in convolution form. The terrain correction has been applied to the gridded gravity. The indirect effects on the computation of geoid undulations, Report No. , Department of Geodetic Science and Surveying, Ohio State University, Columbus, b. Google Scholar Wong, L. and R. Gore, Accuracy of geoid heights from modified Stokes kernels, by: 9.
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The indirect effects on the computation of geoid undulations (Report) Unknown Binding – January 1, by Chugiat Wichiencharoen (Author)Author: Chugiat Wichiencharoen. The indirect effects on the geoid computation due to the second method of Helmert's condensation were studied.
when Helmert's anomalies are used in Stokes's equation, there are three types of corrections to the free air geoid. The first correction, the indirect effect on geoid undulation due to the potential change in Helmert's reduction, had a maximum value of meters in the test area covering Author: C.
Wichiencharoen. Wichiencharoen C () The indirect effects on the computation of geoids undulations. Reports of the department of geodesy science and survey, vol Ohio State University, Columbus Google ScholarCited by: Wang YM, Rapp RH () Terrain e ects in geoid undulation computations Manuscr Geod 23±29 Wichiencharoen C () The indirect e ects on the computation of geoid undulations.
Wichiencharoen, C., The indirect effects on the computation of geoid undulations. OSU Report. NoDepartment of Geodetic Science and Suveying, The Ohio State University, Columbus, Ohio, USA. Google ScholarAuthor: C.
Tocho, G. Font, M.G. Sideris. It consists of removing the effect of the topography according to Helmert’s condensation reduction from gravity anomalies and restoring the corresponding effect, i.e., the indirect effect, to the geoid by: 4.
The reason of this strong indirect effect is in the very high elevations present in our study area: the Bolivian tableland, in which the mean altitude is about m. The new geoid shows minor discrepancy, with the observed geoid undulations obtained for the 17 validation points available on this area, than the global geoid by: 9.
The terrain effect on D g and the indirect effect on N are computed from approximations to Equations 32 and 33 in Sideris, Geoid Determination, Theory and Principles.
These reductions can be used in a remove-restore fashion as pre- and post-processing steps, analogously to the direct and indirect effects of shifting the topographic masses below the geoid. This paper reviews the classical and modem methods of geoid determination in rugged by: The effects of the analytical and the discrete spectra of kernel functions and that of zero-padding on the computation of geoid undulations and terrain corrections are studied in : Sujan Bajracharya.
corresponding indirect effect on the geoid is d N = d T / g. Geoid Determination, Theory and Principles, and geoid undulations are calculated using a system of rectangular prisms.
More specifically, the book presents (for the first time in a single volume) the theory and methodology of the most common technique used for precise determination of the geoid, including the computation of the marine geoid from satellite altimetry data.
These are illustrated by specific examples and actual computations of local geoids. The objective of this paper is to compute a precise geoid/quasigeoid model for Libya based on high resolution gravity and terrain data in combination with a global geopotential model.
This paper gives overview on the work connected with the computation of the first gravimetric geoid for the area of : A. Łyszkowicz, Ahmida Ali Wahiba. The effect of restoration of the slightly different surface.
Using the Bruns's formula, the original masses is the indirect effect. For the determi- indirect effect can be computed as nation of the geoidal undulation, the indirect effect is evaluated at the geoid, i.e.
for Hp = by: 5. Any gravimetric geoid computation based on Stokes’ integral must use anomalies that have been reduced to the geoid, usually by means of Helmert’s second method of condensation (Heiskanen and Moritz, ). This involves the computation of the terrain correction and the indirect effect on the geoid, which are computed from a DTM.
A DTM is alsoAuthor: V. Corchete. The Faye anomalies, the absolute geoid undulation, and the indirect effect on geoid using constant crust density of g/cm3 are compared with those using lateral density by: 1.
or co-geoid, and ﬁnally, after adding also the primary indirect topographic effect (PITE) on the geoid for restoration of the topographic signal, the geoid height follows. The selection of a global geopotential model (GGM) for modeling the long-wavelength for geoid computation is imperative not only because of the plethora of GGMs available but more importantly because it influences the accuracy of a geoid model.
In this study, we propose using the Gaussian averaging function for selecting an optimal GGM and degree and order (d/o) for the remove-compute Cited by: 8. Any gravimetric geoid computation based on Stokes’ integral must use anomalies that have been reduced to the geoid, usually by means of Helmert’s second method of condensation (Heiskanen and Moritz, ).This involves the computation of the terrain correction and the indirect effect on the geoid, which are computed from a by: 6.
Lambert W, Darling F,Tables of determining the form of the geoid and its indirect effect on gravity. Dept Commerce, No.Washington D. Moritz H,Advanced physical geodesy.
H Wichmann Verlag, Karlsruhe. Pavlis N K, Factor J K, Holmes SA,Terrain-Related Gravimetric Quantities Computed for the Next EGM.
harmonic model) to the residual co-geoid undulations, and add a topographic indirect effect term N H (computed from digital elevation data) to form the final geoid undulations.
These steps can be combined in a single formula as follows: The computation of the long-wavelength geoid component N GM was made on a 5'×5' grid, within.Nevertheless, in this study, the secondary indirect effect has been included to obtain a gravimetric geoid with the highest precision possible.
The indirect effect on gravity was computed from the indirect effect N 2 by means of δg = N 2 (in mgal for N 2 in meters).Cited by: 3. The indirect effects on the computation of geoid undulations, Report No.Dept.
of Geodetic Science and Surveying, Ohio State University, Cited by: