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

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Revision 4853 - (hide annotations)
Wed Apr 9 05:41:57 2014 UTC (4 years, 10 months ago) by jfenwick
File MIME type: text/x-python
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Added import division and changed a few / to //

1 jfenwick 4853 from __future__ import division
2 jfenwick 4848 from __future__ import print_function
3 gross 4532 ##############################################################################
4     #
5 jfenwick 4657 # Copyright (c) 2009-2014 by University of Queensland
6 gross 4532 # http://www.uq.edu.au
7     #
8     # Primary Business: Queensland, Australia
9     # Licensed under the Open Software License version 3.0
10     # http://www.opensource.org/licenses/osl-3.0.php
11     #
12     # Development until 2012 by Earth Systems Science Computational Center (ESSCC)
13 jfenwick 4657 # Development 2012-2013 by School of Earth Sciences
14     # Development from 2014 by Centre for Geoscience Computing (GeoComp)
15 gross 4532 #
16     ##############################################################################
17    
18     """3D gravity/magnetic joint inversion example using netCDF data"""
19    
20 jfenwick 4657 __copyright__="""Copyright (c) 2009-2014 by University of Queensland
21 gross 4532 http://www.uq.edu.au
22     Primary Business: Queensland, Australia"""
23     __license__="""Licensed under the Open Software License version 3.0
24     http://www.opensource.org/licenses/osl-3.0.php"""
25     __url__="https://launchpad.net/escript-finley"
26    
27     # Import required modules
28     from esys.downunder import *
29     from esys.escript import unitsSI as U
30     from esys.escript import saveDataCSV
31     from esys.weipa import *
32    
33     # Set parameters
34     MAGNETIC_DATASET = 'data/MagneticSmall.nc'
35     MAG_UNITS = U.Nano * U.Tesla
36     GRAVITY_DATASET = 'data/GravitySmall.nc'
37     GRAV_UNITS = 1e-6 * U.m/(U.sec**2)
38     # background magnetic field components (B_East, B_North, B_Vertical)
39     B_b = [2201.*U.Nano*U.Tesla, 31232.*U.Nano*U.Tesla, -41405.*U.Nano*U.Tesla]
40     PAD_X = 0.2
41     PAD_Y = 0.2
42     thickness = 40. * U.km
43     l_air = 6. * U.km
44     n_cells_v = 25
45 gross 4535 mu_gravity = 1.
46 gross 4532 mu_magnetic = 0.1
47     COORDINATES=CartesianReferenceSystem()
48     #COORDINATES=WGS84ReferenceSystem()
49    
50    
51     def work():
52     # Setup and run the inversion
53     grav_source=NetCdfData(NetCdfData.GRAVITY, GRAVITY_DATASET, scale_factor=GRAV_UNITS, reference_system=COORDINATES)
54     mag_source=NetCdfData(NetCdfData.MAGNETIC, MAGNETIC_DATASET, scale_factor=MAG_UNITS, reference_system=COORDINATES)
55     db=DomainBuilder(dim=3, reference_system=COORDINATES)
56     db.addSource(grav_source)
57     db.addSource(mag_source)
58     db.setVerticalExtents(depth=thickness, air_layer=l_air, num_cells=n_cells_v)
59     db.setFractionalPadding(pad_x=PAD_X, pad_y=PAD_Y)
60     db.setBackgroundMagneticFluxDensity(B_b)
61     db.fixDensityBelow(depth=thickness)
62     db.fixSusceptibilityBelow(depth=thickness)
63    
64     inv=StrongJointGravityMagneticInversion()
65     inv.setSolverTolerance(1e-4)
66     inv.setSolverMaxIterations(50)
67     inv.setup(db)
68     inv.getCostFunction().setTradeOffFactorsModels([mu_gravity, mu_magnetic])
69     inv.getCostFunction().setTradeOffFactorsRegularization(mu = 1.)
70    
71     density, susceptibility = inv.run()
72     print("density = %s"%density)
73     print("susceptibility = %s"%susceptibility)
74    
75     g, wg = db.getGravitySurveys()[0]
76     B, wB = db.getMagneticSurveys()[0]
77 caltinay 4561 if saveSilo("result_gravmag_strong.silo", density=density, gravity_anomaly=g, gravity_weight=wg, susceptibility=susceptibility, magnetic_anomaly=B, magnetic_weight=wB):
78     print("Results saved in result_gravmag_strong.silo")
79 gross 4532 else:
80 caltinay 4561 print("Failed to save silo file. Possibly no Silo support.")
81 gross 4532
82 caltinay 4561 saveVTK("result_gravmag_strong.vtu", density=density, gravity_anomaly=g, gravity_weight=wg, susceptibility=susceptibility, magnetic_anomaly=B, magnetic_weight=wB)
83     print("Results saved in result_gravmag_strong.vtu")
84 gross 4532
85     print("All done. Have a nice day!")
86    
87     if 'NetCdfData' in dir():
88     work()
89     else:
90     print("This example requires scipy's netcdf support which does not appear to be installed.")
91    

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