ERT/IP Processing and Inversion

The ERT & IP module is designed for processing and inversion of ERT and induced polarization data. A unique feature is the ability to invert the full decays of the IP signal and not only the integral IP. The module implements extensive processing tools with pseudo sections showing ERT or IP data, electrode positions with elevation, and full decay IP signals. The module is fully integrated with the GIS interface. Automatic filters help to improve the data quality and speed up the processing. Inversion for both DC and IP can be done in 1D or 2D using smooth, sharp, or layered models. The IP full decay data is modelled with a Cole-Cole or constant phase parametrization.

Processing

The processing tool is integrated with the GIS interface. The processing window shows the data points at each focus depth along with pseudo section, electrode positions, ERT, and IP decay curves. For processing the user can disable electrodes and the corresponding data points, single data points, IP decay curves, and vertical soundings.

Inversion

Inversion of the ERT and IP data is performed with the AarhusInv inversion code. Full waveform IP data are inverted with Cole-Cole or constant phase parametrization. The model can be 1D or 2D with few-layered, many-layered, and sharp models. Starting values for resistivity, thickness, constraints, chargeability, tau, and C can be individually changed for each layer, or optimal values can be chosen automatically. The inversion supports multi CPU cores with a high parallel efficiency.