Airborne Electromagnetic (AEM) Surveying
AEM measures the electromagnetic response of the subsurface
Airborne electromagnetic (AEM) technology was developed for the mining industry for measuring electrical properties of soil, rocks and water however it is also used for natural resource management applications, such as salinity and water quality.
I just happened to be in the area.
31°41'08.5"S 116°29'24.2"E