Abstract
This article gives a brief overview of global geopotential models (GGMs), which are truncated spectral expressions of the Earth’s gravity field in terms of spherical harmonic basis functions. GGMs can be derived from the analysis of the orbits of artificial Earth satellites, terrestrial gravity and terrain data, or a combination of both. Almost all of these GGMs are available in the public domain, as is software to compute various gravity field parameters (e.g., gravity anomalies, gravity disturbances, geoid heights, and gravity gradients). Gravity anomaly maps are plotted over the Australian region from three recent GGMs, two of which include data from the CHAMP dedicated satellite gravimetry mission. A technique is then presented where these GGMs are high-pass filtered (thus yielding bandlimited gravity anomalies) so as to enhance near-surface structures (acknowledging the inherent non-uniqueness of potential field data).
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