Rapid gravity and gravity gradiometry terrain correction via adaptive quadtree mesh discretization

2010 ◽  
Author(s):  
Kristofer Davis ◽  
M. Andy Kass ◽  
Yaoguo Li
Keyword(s):  
Terrain Correction ◽  
Gravity Gradiometry ◽  
Quadtree Mesh

scholarly journals Rapid gravity gradiometry terrain correction via adaptive quadtree mesh discretization

2010 ◽  
Vol 2010 (1) ◽  
pp. 1-4
Author(s):  
M. Andy Kass ◽  
Kristofer Davis ◽  
Yaoguo Li
Keyword(s):  
Terrain Correction ◽  
Gravity Gradiometry ◽  
Quadtree Mesh

Airborne gravity gradiometry: Terrain corrections and elevation error

Geophysics ◽  
2009 ◽  
Vol 74 (5) ◽  
pp. I37-I42 ◽  
Author(s):  
Mark Dransfield ◽  
Yi Zeng
Keyword(s):  
Power Law ◽  
Data Interpretation ◽  
Relative Magnitude ◽  
Terrain Correction ◽  
Flying Height ◽  
Airborne Gravity ◽  
Gravity Gradiometry ◽  
Correction Error ◽  
Terrain Corrections ◽  
Airborne Gravity Gradiometry

Terrain corrections for airborne gravity gradiometry data are calculated from a digital elevation model (DEM) grid. The relative proximity of the terrain to the gravity gradiometer and the relative magnitude of the density contrast often result in a terrain correction that is larger than the geologic signal of interest in resource exploration. Residual errors in the terrain correction can lead to errors in data interpretation. Such errors may emerge from a DEM that is too coarsely sampled, errors in the density assumed in the calculations, elevation errors in the DEM, or navigation errors in the aircraft position. Simple mathematical terrains lead to the heuristic proposition that terrain-correction errors from elevation errors in the DEM are linear in the elevation error but follow an inverse power law in the ground clearance of the aircraft. Simulations of the effect of elevation error on terrain-correction error over four measured DEMs support this proposition. This power-law relation may be used in selecting an optimum survey flying height over a known terrain, given a desired terrain-correction error.

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