A Simulation Study to Test the Prediction of One Degree by One Degree Mean Gravity Anomalies Using Least Squares Collocation from the GRANSAT Mission PDF Download
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Author: U.S. Air Force Geophysics Laboratory
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Category :
Languages : en
Pages :
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Author: U.S. Air Force Geophysics Laboratory
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: D. P. Hajela
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Category : Gravity anomalies
Languages : en
Pages : 52
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Author:
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ISBN:
Category :
Languages : en
Pages : 62
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The purpose of this simulation study was to test the accuracy of prediction of mean gravity anomalies from the GRAVSAT mission, to establish the resolution achievable in terms of anomaly block size, and to draw conclusions for the data requirement for economical processing in terms of computer time. It was found that though the estimates of the formal standard deviation of the predicted 1 deg anomalies were reduced with the increase in size of the data cap, and with the increase in the density of data inside the cap, there was little improvement in the predicted value of 1 deg anomalies by least squares collocation technique. Besides, there was a large increase in the computer time required for the processing of the increased data.
Author: Dhaneshwar Prasad Hajela
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ISBN:
Category :
Languages : en
Pages : 52
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Author: Richard H. Rapp
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Category :
Languages : en
Pages : 25
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The prediction of mean gravity anomalies from other anomalies and satellite altimeter data is described using the technique of least squares collocation. The equations derived are then used in simulation studies, using altimeter data alone, to estimate the accuracy to which mean gravity anomalies can be determined with respect to an ellipsoidal reference field and a degree 12 reference field.
Author: Robert P. Bessette
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Category : Altitudes
Languages : en
Pages : 28
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We previously described (14,14) spherical-harmonic global adjustments of satellite altimetry using the AFGL short-arc technique supplemented with point masses to allow incorporation of short-wavelength geoidal detail. Recently, we have also investigated another technique to enhance short-wavelength detail: least squares collocation with noise. Both methods provide a means to determine a high resolution gravity field on a local, regional or global scale. Statistical comparisons of these two methods have been made in selected areas and the results tabulated.
Author: Glenn N. Smith
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Category : Altimeter
Languages : en
Pages : 151
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This paper examines the application of the statistical prediction concept to the prediction of useful mean gravity anomalies from actual existing gravity data. The primary method of estimation is the least squares prediction procedure of Moritz. Mathematical derivation of the prediction equations and explanation of the notation system are given and prediction equations are applied to the prediction of mean gravity anomalies of 1 degrees and 5 degrees near equal-area blocks.
Author: Erwin Groten
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Category : Gravity
Languages : en
Pages : 30
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The efficiency of prediction of mean gravity anomalies for areas of 1 degree x 1 degree, 2 degree x 2 degree, 5 degree x 5 degree, and 10 degree x 10 degree from known mean anomalies is studied. The least standard prediction error is found to be about 1/2 (var) 1/2 where var is the variance of mean anomalies. The influence of the nearest neighbors is prevailing. The prediction from many known anomalies is about the same as from only a few known values. (Author).
Author: Georges Blaha
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Category : Earth (Planet)
Languages : en
Pages : 24
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Author: Ramon Misho
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ISBN:
Category :
Languages : en
Pages : 92
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