Aerial gravity surveys are not particularly new. I've done a ground-based survey, but we were looking for a weak anomaly and the region had strong topography s

Aerial gravity surveys are not particularly new. I've done a ground-based survey, but we were looking for a weak anomaly and the region had strong topography so the results were dubious (the inverse problem is very ill-posed to begin with and the topography doesn't help). The GRACE satellites are a neat instrument. http://en.wikipedia.org/wiki/Gravity_Recovery_and_Climate_Experiment http://en.wikipedia.org/wiki/Gravity_Recovery_and_Climate_Ex...