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Revision 4175 - (show annotations)
Wed Jan 30 05:01:50 2013 UTC (6 years, 2 months ago) by caltinay
Original Path: trunk/doc/examples/inversion/magnetic_netcdf.py
File MIME type: text/x-python
File size: 2209 byte(s)
joint netcdf example and some minor fixes to other example/test case.

1
2 ##############################################################################
3 #
4 # Copyright (c) 2009-2013 by University of Queensland
5 # http://www.uq.edu.au
6 #
7 # Primary Business: Queensland, Australia
8 # Licensed under the Open Software License version 3.0
9 # http://www.opensource.org/licenses/osl-3.0.php
10 #
11 # Development until 2012 by Earth Systems Science Computational Center (ESSCC)
12 # Development since 2012 by School of Earth Sciences
13 #
14 ##############################################################################
15
16 """3D magnetic inversion example using netCDF data"""
17
18 __copyright__="""Copyright (c) 2009-2013 by University of Queensland
19 http://www.uq.edu.au
20 Primary Business: Queensland, Australia"""
21 __license__="""Licensed under the Open Software License version 3.0
22 http://www.opensource.org/licenses/osl-3.0.php"""
23 __url__="https://launchpad.net/escript-finley"
24
25 # Import required modules
26 from esys.downunder import *
27 from esys.downunder.minimizers import MinimizerMaxIterReached
28 from esys.escript import unitsSI as U
29 from esys.weipa import saveSilo
30
31 # Set parameters
32 DATASET = 'magnetic_anomaly.nc'
33 latitude = -28.5
34 PAD_X = 0.2
35 PAD_Y = 0.2
36 thickness = 40. * U.km
37 l_air = 6. * U.km
38 n_cells_v = 25
39 mu = 0.1
40
41 # Setup and run the inversion
42 B_b=simpleGeoMagneticFluxDensity(latitude=latitude)
43 source=NetCdfData(NetCdfData.MAGNETIC, DATASET)
44 db=DomainBuilder(dim=3)
45 db.addSource(source)
46 db.setVerticalExtents(depth=thickness, air_layer=l_air, num_cells=n_cells_v)
47 db.setFractionalPadding(pad_x=PAD_X, pad_y=PAD_Y)
48 db.setBackgroundMagneticFluxDensity(B_b)
49 db.fixSusceptibilityBelow(depth=thickness)
50
51 inv=MagneticInversion()
52 inv.setSolverTolerance(1e-4)
53 inv.setSolverMaxIterations(50)
54 inv.setup(db)
55 inv.getCostFunction().setTradeOffFactorsModels(mu)
56
57 print("Starting inversion, please stand by...")
58 try:
59 susceptibility = inv.run()
60 except MinimizerMaxIterReached as e:
61 print(e)
62 susceptibility = inv.p
63
64 print("susceptibility = %s"%susceptibility)
65
66 # Save results
67 B, w = inv.getCostFunction().getForwardModel().getSurvey(0)
68 saveSilo("result_magnetic.silo", susceptibility=susceptibility, magnetic_anomaly=B[2], magnetic_weight=w[2])
69 print("Results saved in result_magnetic.silo. Good bye.")
70

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