... colour me very very impressed.
wiggy,
Have a look at the impressively colourful maps in the following links.
Thanks Asturias56 for posting the Airborne Gravity link. Interestingly, the survey that I was involved with, used what as far as I know, is the only commercially successful airborne gravity meter, rather than a gradiometer.
The first link is a good summary from the survey company’s web page. The second link is a technical article with enough technical detail to make your head spin, but it points out how post-survey processing is the key to good results.
An important factor in obtaining good results is having a good QC consultant, whose job is to keep the contractor to the survey specs and to require reflying of any lines that don’t meet the specs. We had a very good one - he flew with the crew in the Caravan on every survey line.
Even though they started at first light, to minimize turbulence, flying for several hours at low level over African savannah is an exhausting business.
SGL - Airborne Gravity with AIRGrav
https://csegrecorder.com/articles/vi...gravity-system
As an aside, my house lies within the area of the Turner Valley survey described in the links!