/[escript]/trunk/downunder/test/python/inversion_gravmag_2d.py
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Contents of /trunk/downunder/test/python/inversion_gravmag_2d.py

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Revision 4213 - (show annotations)
Tue Feb 19 01:16:29 2013 UTC (7 years, 4 months ago) by caltinay
File MIME type: text/x-python
File size: 3425 byte(s)
Some cleanup and more consistent logging.

1
2 ##############################################################################
3 #
4 # Copyright (c) 2003-2013 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 """2D magnetic/gravity joint inversion example using synthetic data"""
17
18 __copyright__="""Copyright (c) 2003-2013 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 os
26 from esys.downunder import *
27 from esys.escript import unitsSI as U
28 from esys.weipa import saveSilo
29
30 try:
31 WORKDIR=os.environ['DOWNUNDER_WORKDIR']
32 except KeyError:
33 WORKDIR='.'
34
35 # interesting parameters:
36 depth_offset = 0. * U.km
37 n_humps_h = 3
38 n_humps_v = 1
39 mu = 100.
40 n_cells_in_data = 100
41 full_knowledge = False
42 spherical = False
43 latitude = -28.5
44 #
45 DIM = 2
46 n_cells_in_data = max(n_humps_h*7, n_cells_in_data)
47 l_data = 100. * U.km
48 l_pad = 40. * U.km
49 THICKNESS = 20. * U.km
50 l_air = 20. * U.km
51 n_cells_v = max(
52 int((2*l_air+THICKNESS+depth_offset)/l_data*n_cells_in_data + 0.5), 25)
53
54 B_b=simpleGeoMagneticFluxDensity(latitude=latitude)
55
56 grav_data=SyntheticData(DataSource.GRAVITY, n_length=n_humps_h, n_depth=n_humps_v,
57 depth=THICKNESS+depth_offset, depth_offset=depth_offset,
58 DIM=DIM, number_of_elements=n_cells_in_data, length=l_data,
59 data_offset=0, full_knowledge=full_knowledge, spherical=spherical)
60
61 mag_data=SyntheticData(DataSource.MAGNETIC, n_length=n_humps_h, n_depth=n_humps_v,
62 depth=THICKNESS+depth_offset, depth_offset=depth_offset,
63 DIM=DIM, number_of_elements=n_cells_in_data, length=l_data, B_b=B_b,
64 data_offset=0, full_knowledge=full_knowledge, spherical=spherical)
65
66 domainbuilder=DomainBuilder(dim=DIM)
67 domainbuilder.addSource(grav_data)
68 domainbuilder.addSource(mag_data)
69 domainbuilder.setVerticalExtents(depth=l_air+THICKNESS+depth_offset,
70 air_layer=l_air, num_cells=n_cells_v)
71 domainbuilder.setPadding(l_pad)
72 domainbuilder.fixDensityBelow(depth=THICKNESS+depth_offset)
73 domainbuilder.fixSusceptibilityBelow(depth=THICKNESS+depth_offset)
74 domainbuilder.setBackgroundMagneticFluxDensity(B_b)
75
76 inv=JointGravityMagneticInversion()
77 inv.setSolverTolerance(1e-4)
78 inv.setSolverMaxIterations(50)
79 inv.setup(domainbuilder)
80
81 inv.getCostFunction().setTradeOffFactorsModels([10., 1.])
82 inv.getCostFunction().setTradeOffFactorsRegularization(mu = [1.,1.], mu_c=1.)
83
84 rho_new, k_new = inv.run()
85 rho_ref = grav_data.getReferenceProperty()
86 k_ref = mag_data.getReferenceProperty()
87 print("rho_new = %s"%rho_new)
88 print("rho = %s"%rho_ref)
89 print("k_new = %s"%k_new)
90 print("k = %s"%k_ref)
91
92 g, chi = inv.getCostFunction().getForwardModel(inv.DENSITY).getSurvey(0)
93 B, chi = inv.getCostFunction().getForwardModel(inv.SUSCEPTIBILITY).getSurvey(0)
94
95 saveSilo(os.path.join(WORKDIR, 'results_joint_2d'),
96 density=rho_new, density_ref=rho_ref,
97 susceptability=k_new, susceptability_ref=k_ref,
98 g_data=g, B_data=B, chi=chi)
99

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