Airborne geophysical surveys

SkyTEM Surveys is a Danish airborne geophysical company with more than 12 years of experience in the mapping of water resources. SkyTEM is an innovative and technologically advanced helicopter-borne geophysical system specifically designed to map buried aquifers. This unique technology, capable of mapping the top 500 metres of the Earth in fine detail in 3 dimensions, was conceived and developed in Denmark, a country with a reputation for environmental care and R&D. SkyTEM has helped geological organizations and government water agencies on seven continents unearth a wealth of information about their aquifers.

Source: http://skytem.com/electromagnetic-methods-geophysics/