/[escript]/trunk/doc/examples/inversion/strong_gravmag_netcdf.py
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Contents of /trunk/doc/examples/inversion/strong_gravmag_netcdf.py

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Mon Jun 29 03:59:06 2015 UTC (3 years, 8 months ago) by sshaw
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adding copyright headers to files without copyright info, moved header to top of file in some cases where it wasn't
1 ##############################################################################
2 #
3 # Copyright (c) 2009-2015 by The 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 2012-2013 by School of Earth Sciences
12 # Development from 2014 by Centre for Geoscience Computing (GeoComp)
13 #
14 ##############################################################################
15 from __future__ import division, print_function
16
17 """3D gravity/magnetic joint inversion example using netCDF data"""
18
19 __copyright__="""Copyright (c) 2009-2015 by The University of Queensland
20 http://www.uq.edu.au
21 Primary Business: Queensland, Australia"""
22 __license__="""Licensed under the Open Software License version 3.0
23 http://www.opensource.org/licenses/osl-3.0.php"""
24 __url__="https://launchpad.net/escript-finley"
25
26 # Import required modules
27 from esys.downunder import *
28 from esys.escript import unitsSI as U
29 from esys.escript import saveDataCSV
30 from esys.weipa import *
31
32 # Set parameters
33 MAGNETIC_DATASET = 'data/MagneticSmall.nc'
34 MAG_UNITS = U.Nano * U.Tesla
35 GRAVITY_DATASET = 'data/GravitySmall.nc'
36 GRAV_UNITS = 1e-6 * U.m/(U.sec**2)
37 # background magnetic field components (B_East, B_North, B_Vertical)
38 B_b = [2201.*U.Nano*U.Tesla, 31232.*U.Nano*U.Tesla, -41405.*U.Nano*U.Tesla]
39 PAD_X = 0.2
40 PAD_Y = 0.2
41 thickness = 40. * U.km
42 l_air = 6. * U.km
43 n_cells_v = 25
44 mu_gravity = 1.
45 mu_magnetic = 0.1
46 COORDINATES=CartesianReferenceSystem()
47 #COORDINATES=WGS84ReferenceSystem()
48
49
50 def work():
51 # Setup and run the inversion
52 grav_source=NetCdfData(NetCdfData.GRAVITY, GRAVITY_DATASET, scale_factor=GRAV_UNITS, reference_system=COORDINATES)
53 mag_source=NetCdfData(NetCdfData.MAGNETIC, MAGNETIC_DATASET, scale_factor=MAG_UNITS, reference_system=COORDINATES)
54 db=DomainBuilder(dim=3, reference_system=COORDINATES)
55 db.addSource(grav_source)
56 db.addSource(mag_source)
57 db.setVerticalExtents(depth=thickness, air_layer=l_air, num_cells=n_cells_v)
58 db.setFractionalPadding(pad_x=PAD_X, pad_y=PAD_Y)
59 db.setBackgroundMagneticFluxDensity(B_b)
60 db.fixDensityBelow(depth=thickness)
61 db.fixSusceptibilityBelow(depth=thickness)
62
63 inv=StrongJointGravityMagneticInversion()
64 inv.setSolverTolerance(1e-4)
65 inv.setSolverMaxIterations(50)
66 inv.setup(db)
67 inv.getCostFunction().setTradeOffFactorsModels([mu_gravity, mu_magnetic])
68 inv.getCostFunction().setTradeOffFactorsRegularization(mu = 1.)
69
70 density, susceptibility = inv.run()
71 print("density = %s"%density)
72 print("susceptibility = %s"%susceptibility)
73
74 g, wg = db.getGravitySurveys()[0]
75 B, wB = db.getMagneticSurveys()[0]
76 if saveSilo("result_gravmag_strong.silo", density=density, gravity_anomaly=g, gravity_weight=wg, susceptibility=susceptibility, magnetic_anomaly=B, magnetic_weight=wB):
77 print("Results saved in result_gravmag_strong.silo")
78 else:
79 print("Failed to save silo file. Possibly no Silo support.")
80
81 saveVTK("result_gravmag_strong.vtu", density=density, gravity_anomaly=g, gravity_weight=wg, susceptibility=susceptibility, magnetic_anomaly=B, magnetic_weight=wB)
82 print("Results saved in result_gravmag_strong.vtu")
83
84 print("All done. Have a nice day!")
85
86 if 'NetCdfData' in dir():
87 work()
88 else:
89 print("This example requires scipy's netcdf support which does not appear to be installed.")
90

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