Skytem – Data Processing And A Survey

Approximately 50,000 ground based TEM soundings have been carried out in Denmark during<br>the last decade for groundwater investigations. This number will increase in the future and therefore we<br>have developed a new helicopter time-domain electromagnetic (TEM) system, SkyTEM.<br>In the development and design of the SkyTEM system it has been an unchangeable demand that<br>the data quality of the SkyTEM system should be the same or better than the data quality from ground<br>based systems obtained by e.g. the Protem 47 system (40 x 40 m central loop configuration). Because<br>the amounts of data produced from the system are very high, new concepts for the processing and<br>inversion of TEM data have been developed.<br>In this paper we discuss the processing of the data produced by the SkyTEM system – GPS data,<br>transmitter frame angle and altitude data, transmitter status parameters and the transient decays. We<br>conclude the paper by presenting the results from a 50 km2 large groundwater survey west of Århus<br>which demonstrates the high resolution capabilities of the SkyTEM system.