# Contents of /trunk/doc/inversion/intro.tex

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 1 2 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% 3 % Copyright (c) 2003-2013 by University of Queensland 4 5 % 6 % Primary Business: Queensland, Australia 7 % Licensed under the Open Software License version 3.0 8 9 % 10 % Development until 2012 by Earth Systems Science Computational Center (ESSCC) 11 % Development since 2012 by School of Earth Sciences 12 % 13 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% 14 15 16 \chapter*{Overview}\label{sec:Intro} 17 The \downunder module for \python is designed to perform the inversion of 18 geophysical data such as gravity and magnetic anomalies using a parallel 19 supercomputer. 20 The solution approach bases entirely on the finite element method and is 21 therefore different from the usual approach based on Green's functions 22 and linear algebra techniques. 23 The module is implemented on top of the \escript solver environment for 24 \python and is distributed as part of the \escript package through 25 \url{https://launchpad.net/escript-finley}. 26 We refer to the \escript documentation~\cite{ESCRIPT} for installation 27 instructions and to \cite{ESCRIPTCOOKBOOK} for a basic introduction to \escript. 28 29 This document is split into two parts: 30 Part~\ref{part1} provides a tutorial-style introduction to running inversions 31 with the \downunder module. 32 Users with minimal or no programming skills should be able to follow the 33 tutorial which demonstrates how to run inversions of gravity anomaly data, 34 magnetic anomaly data and the combination of both. 35 The scripts and data files used in the examples are provided with the \escript 36 distribution. 37 38 Part~\ref{part2} gives more details on the mathematical methods used and the 39 module infrastructure. 40 It is the intention of this part to give users a deeper understanding of how 41 \downunder is implemented and also to open the door for experienced \python 42 programmers to build their own inversion programs using \downunder components 43 and the \escript infrastructure. 44 45 The development project of \downunder is part of the AuScope Inversion Lab. The work is funded 46 under Australian Geophysical Observing System, 47 see~\url{http://auscope.org.au/site/agos.php}, through the Education Investment Fund of 48 the Australian Commonwealth (2011-2014) and under the AuScope Sustainability Funding (2011-12) 49 with the support of the School of Earth Sciences at the University of Queensland, see~\url{http://www.earth.uq.edu.au/}.