Validating SkyTEM Data Against Ground-based TEM Data at the Danish National Test Site by Upward Continuation

In this abstract we show the results from a comparison of models from the SkyTEM-system with the ground based models at the extended test site. The comparison will also be carried out in data space by an upward continuation of the reference models to a SkyTEM-system response at nominal height. Furthermore, the repeatability of the SkyTEM-system at different heights is demonstrated. The national TEM test site was established to ensure that any TEM system used in the ongoing Danish groundwater mapping campaign can reproduce the reference models and match the upward continued responses of the reference model. The site was established in 2001. In 2009 the test site was extended from a point location with a known reference response and resistivity model to two crossing lines. This makes calibration and validation possible for airborne TEM-systems that cannot make hovering spot measurements. SkyTEM and VTEM have been on the new test lines so far. For the SkyTEM system we can conclude that it reproduces the ground-based TEM data and models very good and that SkyTEM data shows consistent results for different altitudes. In the data space we calculate an upward-continued dataset to perform the comparisons.