Reports

Numerical tools and optimizations for EM geophysical methods, September 2017  - pdf
A technical report that introduces our OpenMP parallelization framework, which is freely available here. Furthermore, the technical report introduces our block-parallel sparse iterative linear solver, which is freely available here.

Antartica SkyTEM survey report, July 2015 - pdf
Survey report documenting the processing and inversion of the data from the SkyTEM Antartica survey. 

Comparison  Syscal Pro and Abem Terrameter LS, May 2014 - pdf.
The report contains a throughout comparison of the DC/IP instruments Syscal Pro and ABEM Terrameter LS. The report documents the data quality, injection parameters and measured data one can acquire with both instruments. The comparison is done on the basis of a profile measured at the exact same location. 

NiCA SkyTEM survey report, July 2012 - pdf (331 Mb, right click, save link as)
This is the first survey made with the new Mini-SkyTEM sytem whose very low moment and short turn-off allow the use of very early gates down to 5-6 µs. This survey was made as part of the NiCA project (www.nitrat.dk) in which the purpose is to model the reduction of the nitrates in the near-surface aquifers (top 30 m), in order to propose a better optimized regulation of the use of fertilizers by identifying the more risky areas.

Refinement of the TEM reference model at Lyngby, June 2012 - pdf.
The initial report has been updated regarding the example of the Sorø SkyTEM survey for which little errors have been found. It does not change the conclusions of the first report, but provides slightly improved results for Sorø example.

Refinement of the TEM reference model at Lyngby, 2011 - pdf
Investigations at the national TEM test site have revealed that the reference model has too low resistivities in the upper 15 m of the model. This is based on a detailed three-dimensional characterization of the site by means of the ERT method and of an electrical conductivity log to clarify any anisotropy at the Lyngby site.

Guide for processing and inversion of SkyTEM data, Aarhus Workbench, 2011 - pdf
The purpose of the document is to support the processing and inversion of SkyTEM data using the program Aarhus Workbench.

Validation of the SkyTEM system at the extended TEM test site, 2010. GFS, 2010 - pdf.
The helicopter transient electromagnetic system SkyTEM has been used for resistivity mapping in a hydrogeological context since 2003 in Denmark and in recent years to a large extent worldwide as well. From the beginning, a very high data quality was demanded for the SkyTEM system to ensure seamless results when it was used together with the large amounts of existing high-quality groundbased TEM data. The high data quality is ensured by a comprehensive data quality control scheme, among other things including calibration at the Danish national TEM test site and a day-by-day documentation of repeatability at the survey-specific test site.