Abstract
Abstract The AntGrav project, funded by the German Research Foundation (DFG) has the main objective to homogenize and optimize Antarctic gravity field information. Within this project an evaluation procedure is needed to inspect all different kind of gravity field surveys available in Antarctica. In this paper a suitable methodology is proposed. We present an approach for fast 3D gravity point data reduction in different spectral bands. This is achieved through pre-calculating a fine 3D mesh of synthesized gravity functionals over the entirety of the Antarctic continent, for which two different global models are used: the combined satellite model GOCO05s for the long-wavelength part, and the topographic model Earth2014 for the shorter wavelengths. To maximize the applicability separate meshes are calculated for different spectral bands in order to specifically reduce a certain band or a selected combination. All meshes are calculated for gravity anomalies as well as gravity disturbances. Utilizing these meshes, synthesized gravity data at arbitrary positions is computed by conventional 3D interpolation methods (e.g. linear, cubic or spline). It is shown that the applied approach can reach a worst-case interpolation error of less than 1 mGal. Evaluation results are presented for the AntGG grid and exemplary for the in-situ measurements of the AGAP and BAS-LAND campaigns. While general properties, large-scale errors and systematic effects can usually be detected, small-scale errors (e.g. of single points) are mostly untraceable due to the uncertainties within the topographic model.
Highlights
The AntGrav project, funded by the German Research Foundation (DFG) has the main objective to homogenize and optimize Antarctic gravity eld information
We present an approach for fast 3D gravity point data reduction in di erent spectral bands
This is achieved through pre-calculating a ne 3D mesh of synthesized gravity functionals over the entirety of the Antarctic continent, for which two di erent global models are used: the combined satellite model GOCO05s for the longwavelength part, and the topographic model Earth2014 for the shorter wavelengths
Summary
Abstract: The AntGrav project, funded by the German Research Foundation (DFG) has the main objective to homogenize and optimize Antarctic gravity eld information. Such a gravity eld model must be as independent and as correct as possible as well as o er the highest possible resolution It shall be given in the spectral domain in order to address the consistent adaption on di erent observation types (e.g. gravity anomalies and disturbances). It is proposed to apply a two-step synthesis method, where in a rst step gravity eld information is pre-calculated on regular geographic 3D grids and in a second step interpolated on the individual scattered point positions. The spline-interpolation method shows the best interpolation accuracy, the cubic approach is more favorable, as the actual implementation requires less memory and the performance is still within a reasonable limit for the purpose of evaluation (as uncertainties within the SATOP1 model are expected to exceed the interpolation error)
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