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

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Revision 6812 - (show annotations)
Fri May 3 00:36:47 2019 UTC (4 months, 2 weeks ago) by aellery
File MIME type: text/x-python
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Another silo fix


1 ##############################################################################
2 #
3 # Copyright (c) 2009-2018 by The University of Queensland
4 # http://www.uq.edu.au
5 #
6 # Primary Business: Queensland, Australia
7 # Licensed under the Apache License, version 2.0
8 # http://www.apache.org/licenses/LICENSE-2.0
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
16 """3D gravity/magnetic joint inversion example using netCDF data"""
17 from __future__ import division, print_function
18
19 __copyright__="""Copyright (c) 2009-2018 by The University of Queensland
20 http://www.uq.edu.au
21 Primary Business: Queensland, Australia"""
22 __license__="""Licensed under the Apache License, version 2.0
23 http://www.apache.org/licenses/LICENSE-2.0"""
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 import logging
32 logger=logging.getLogger('inv.MinimizerLBFGS')
33 logger.setLevel(logging.DEBUG)
34
35 # Set parameters
36 MAGNETIC_DATASET = 'data/MagneticSmall.nc'
37 MAG_UNITS = U.Nano * U.Tesla
38 GRAVITY_DATASET = 'data/GravitySmall.nc'
39 GRAV_UNITS = 1e-6 * U.m/(U.sec**2)
40 # background magnetic field components (B_East, B_North, B_Vertical)
41 B_b = [2201.*U.Nano*U.Tesla, 31232.*U.Nano*U.Tesla, -41405.*U.Nano*U.Tesla]
42 PAD_X = 0.2
43 PAD_Y = 0.2
44 thickness = 40. * U.km
45 l_air = 6. * U.km
46 n_cells_v = 25
47 mu_gravity = 10./2
48 mu_magnetic = 0.1/2/2
49 COORDINATES=CartesianReferenceSystem()
50 #COORDINATES=WGS84ReferenceSystem()
51
52
53 def work():
54 # Setup and run the inversion
55 grav_source=NetCdfData(NetCdfData.GRAVITY, GRAVITY_DATASET, scale_factor=GRAV_UNITS, reference_system=COORDINATES)
56 mag_source=NetCdfData(NetCdfData.MAGNETIC, MAGNETIC_DATASET, scale_factor=MAG_UNITS, reference_system=COORDINATES)
57 db=DomainBuilder(dim=3, reference_system=COORDINATES)
58 db.addSource(grav_source)
59 db.addSource(mag_source)
60 db.setVerticalExtents(depth=thickness, air_layer=l_air, num_cells=n_cells_v)
61 db.setFractionalPadding(pad_x=PAD_X, pad_y=PAD_Y)
62 db.setBackgroundMagneticFluxDensity(B_b)
63 db.fixDensityBelow(depth=thickness)
64 db.fixSusceptibilityBelow(depth=thickness)
65
66 inv=JointGravityMagneticInversion()
67 inv.setSolverTolerance(1e-4)
68 inv.setSolverMaxIterations(100)
69 inv.setup(db)
70 inv.getCostFunction().setTradeOffFactorsModels([mu_gravity, mu_magnetic])
71 inv.getCostFunction().setTradeOffFactorsRegularization(mu = [1.,1.], mu_c=1.)
72
73 density, susceptibility = inv.run()
74 print("density = %s"%density)
75 print("susceptibility = %s"%susceptibility)
76
77 g, wg = db.getGravitySurveys()[0]
78 B, wB = db.getMagneticSurveys()[0]
79 if saveSilo("result_gravmag.silo", density=density, gravity_anomaly=g, gravity_weight=wg, susceptibility=susceptibility, magnetic_anomaly=B, magnetic_weight=wB):
80 print("Results saved in result_gravmag.silo")
81 else:
82 print("Failed to save result_gravmag.silo. Possibly no Silo support.")
83
84 saveVTK("result_gravmag.vtu", density=density, gravity_anomaly=g, gravity_weight=wg, susceptibility=susceptibility, magnetic_anomaly=B, magnetic_weight=wB)
85 print("Results saved in result_gravmag.vtu")
86
87 saveDataCSV("result_gravmag.csv", density=density, susceptibility=susceptibility, x=susceptibility.getFunctionSpace().getX())
88 print("Results saved in result_gravmag.csv")
89
90 print("All done. Have a nice day!")
91
92 try:
93 import pyproj
94 HAVE_PYPROJ = True
95 except ImportError:
96 HAVE_PYPROJ = False
97
98 try:
99 import esys.ripley
100 HAVE_RIPLEY = True
101 except ImportError:
102 HAVE_RIPLEY = False
103
104 if 'NetCdfData' not in dir():
105 print("This example requires scipy's netcdf support which does not appear to be installed.")
106 elif not HAVE_RIPLEY:
107 print("Ripley module not available")
108 elif not HAVE_PYPROJ:
109 print("This example requires pyproj to be installed.")
110 else:
111 work()
112

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