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- W2148422182 abstract "The critically important steps to get best value from your gravity gradiometry data, assuming your contractor has done his job well in designing and acquiring the data, is the preparation of the representation of the potential field gradients. The ~200 m resolving power of existing gradiometer systems approaches what is necessary for minerals applications. In particular, beyond the aircraft, the topographic surface represents the largest and most proximal density contrast encountered in an airborne survey. Hence terrain effects can have significant impact on AGG data. The critical steps are: Terrain correction and determining ‘best’ terrain densityGridding, using all the measured gradients to constrain the interpolationSmoothing/de-noising by using the 3 rd order tensor constraintsAnti-alias filtering of the gradient signals so that wave lengths are properly represented in all directionsTransformation of the gradients by integration to estimate the gravity or magnetic fieldTerrain corrections are a necessary step in the processing of observed AGG data in rugged terrain, in order to highlight subsurface density variations with a minimal overprint from the terrain. We propose a simple and rapid AGG tensor-based method to estimate an optimum bulk terrain density for subsequent terrain-correction. Each of the currently deployed systems for acquiring gradiometry is evolving driven by competition and the users’ needs. Mining applications of the technology to directly detect ore-bodies that show up as anomalies can now be successful provided the dimensions are of the order of 200 m or more. High resolution 3D geology models of operating mines can be used to calibrate gradiometry surveys" @default.
- W2148422182 created "2016-06-24" @default.
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- W2148422182 date "2013-12-01" @default.
- W2148422182 modified "2023-09-25" @default.
- W2148422182 title "Getting the best value from gravity gradiometry" @default.
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- W2148422182 doi "https://doi.org/10.1071/aseg2013ab054" @default.
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