Rapid gravity and gravity gradiometry terrain corrections via an adaptive quadtree mesh discretization
Kristofer Davis 1 2 M. Andy Kass 1 Yaoguo Li 11 Center for Gravity, Electrical, and Magnetic Studies, Department of Geophysics, Colorado School of Mines, 1500 Illinois Street, Golden, CO 80401, USA.
2 Corresponding author. Email: kdavis@eos.ubc.ca
Exploration Geophysics 42(1) 88-97 https://doi.org/10.1071/EG10016
Submitted: 7 July 2010 Accepted: 19 December 2010 Published: 25 February 2011
Abstract
We present a method for modelling the terrain response of gravity gradiometry surveys utilising an adaptive quadtree mesh discretization. The data- and terrain-dependent method is tailored to provide rapid and accurate terrain corrections for draped and barometric airborne surveys. The surface used in the modelling of the terrain effect for each datum is discretized automatically to the largest cell size that will yield the desired accuracy, resulting in much faster modelling than full-resolution calculations. The largest cell sizes within the model occur in areas of minimal terrain variation and at large distances away from the datum location. We show synthetic and field examples for proof of concept. In the presented field example, the adaptive quadtree method reduces the computational cost by performing 351 times fewer calculations than the full model would require while retaining an accuracy of one Eötvös for the gradient data. The method is also used for the terrain correction of the gravity field and performed 310 times faster compared with a calculation of the full digital elevation model.
Key words: gravity, gravity gradiometry, processing, quadtree, terrain correction.
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