Processing of groundbased TEM - SiTEM/Semdi

The SiTEM/Semdi program package is a powerful tool for processing and inversion of ground-based time-domain electromagnetic data (TEM). Over the last 10 years the software package has been used to process and invert more than 30 000 TEM-soundings in Denmark.

Main features

• Import of raw data and additional measurement parameters to a database.
• All systems supported through the USF-format
• Graphical user interface for data processing.
• Full non-linear 1D-inversion. Both multi-layer and few-layer inversions are supported. Batch mode support for large surveys.
• A priori information on resistivities, thicknesses or depths are easily included using soft constraints.
• Evaluation of inversion results.

Processing

SiTEM is the processing part of the program package. The TEM processing is easily accessed via a graphical user interface (desktop example). Multiple data plots can be viewed at the same time to assist in the processing procedure. Bad data are removed directly in the data plot windows using the mouse. The data uncertainty can be determined either from noise measurements or directly from the data stack.

Data input formats:

• USF-format
• Geonics PROTEM47/57
• Raw data from other TEM receivers - on request

Inversion

Semdi is the processing part of the program package. Besides inversion of TEM data, the software supports joint inversion of TEM and resistivity data using the Mutually Constrained Inversion (MCI) approach - desktop example. A priori information on resistivities, thicknesses or depths can be added to the individual models.

Information about prices and licenses on the SiTEM/Semdi download page.

Further reading

Getting started with SiTEM and Semdi (pdf - 0.5 Mb).