We show that it is practical to invert entire airborne electromagnetic (AEM) surveys to 3D conductivity models with hundreds of thousands of cells within a day on a workstation. We have exploited the fact that the area of the footprint of an AEM system is significantly smaller than the area of an AEM survey to develop a robust 3D inversion method which uses a moving footprint. Our implementatio...

This contribution is concerned with a generalization of Itoh and Tsujii’s algorithm for inversion in extension fields GF (q). Unlike the original algorithm, the method introduced here uses a standard (or polynomial) basis representation. The inversion method is generalized for standard basis representation and relevant complexity expressions are established, consisting of the number of extensio...

We present three-dimensional inversion algorithms for inversion of cross-well electromagnetic and controlled-source electromagnetic (CSEM) data. The inversion is accomplished with a Gauss-Newton technique where the model parameters are forced to lie within their upper and lower bounds by means of a non-linear transformation procedure. The Jacobian is computed using an adjoint method. A line sea...

In order to look for a generic scatterometer inversion method, the ERS inversion is revisited in this paper. First, the use of measurement noise information, which includes a realistic geophysical noise term, is tested. It turns out that the shape of the solution surface is more important than the noise information for inversion. Such shape has to be symmetric or circular as a function of wind ...