Full text loading...
-
Efficient 2D Hybrid Inversion of Airborne Frequency Domain Data
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, Second European Airborne Electromagnetics Conference, Sep 2017, Volume 2017, p.1 - 5
- Previous article
- Table of Contents
- Next article
Abstract
We present a 2D inversion code for frequency-domain HEM data designed for inverting field scale surveys on normal desktop computers. The fundamental algorithm is a 2.5D algorithm with field separation into primary and secondary fields. Due to limited memory, as well as performance concerns, sectioning is introduced for splitting large surveys into smaller sections. Sectioning is only done when calculating the 2D forward and derivatives, and it is done with a sufficient overlap, such that vital 2D information is preserved. The algorithm uses a hybrid scheme which i) starts with 1D forward and inverse calculations, ii) then switches to 2D forward calculations and 1D derivatives, and iii) finally ends with full 2D calculations. The result of this is a code which produces results like a 2D code, but with a substantially shorter computational time.