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2 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
3 % Copyright (c) 2003-2013 by University of Queensland
4 % http://www.uq.edu.au
5 %
6 % Primary Business: Queensland, Australia
7 % Licensed under the Open Software License version 3.0
8 % http://www.opensource.org/licenses/osl-3.0.php
9 %
10 % Development until 2012 by Earth Systems Science Computational Center (ESSCC)
11 % Development since 2012 by School of Earth Sciences
12 %
13 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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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/}.

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