/[escript]/trunk/doc/examples/inversion/gravmag_netcdf.py
ViewVC logotype

Contents of /trunk/doc/examples/inversion/gravmag_netcdf.py

Parent Directory Parent Directory | Revision Log Revision Log


Revision 4209 - (show annotations)
Mon Feb 18 06:00:56 2013 UTC (6 years, 7 months ago) by caltinay
File MIME type: text/x-python
File size: 2720 byte(s)
Fixed joint example file, added ER Mapper plot script, updated content file.

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 gravity/magnetic joint 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 MAGNETIC_DATASET = 'magnetic_anomaly.nc'
33 GRAVITY_DATASET = 'gravity_anomaly.nc'
34 latitude = -28.5
35 PAD_X = 0.2
36 PAD_Y = 0.2
37 thickness = 40. * U.km
38 l_air = 6. * U.km
39 n_cells_v = 25
40 mu_gravity = 10.
41 mu_magnetic = 0.1
42
43 # Setup and run the inversion
44 B_b=simpleGeoMagneticFluxDensity(latitude=latitude)
45 grav_source=NetCdfData(NetCdfData.GRAVITY, GRAVITY_DATASET)
46 mag_source=NetCdfData(NetCdfData.MAGNETIC, MAGNETIC_DATASET)
47 db=DomainBuilder(dim=3)
48 db.addSource(grav_source)
49 db.addSource(mag_source)
50 db.setVerticalExtents(depth=thickness, air_layer=l_air, num_cells=n_cells_v)
51 db.setFractionalPadding(pad_x=PAD_X, pad_y=PAD_Y)
52 db.setBackgroundMagneticFluxDensity(B_b)
53 db.fixDensityBelow(depth=thickness)
54 db.fixSusceptibilityBelow(depth=thickness)
55
56 inv=JointGravityMagneticInversion()
57 inv.setSolverTolerance(1e-4)
58 inv.setSolverMaxIterations(50)
59 inv.setup(db)
60 inv.getCostFunction().setTradeOffFactorsModels([mu_gravity, mu_magnetic])
61 inv.getCostFunction().setTradeOffFactorsRegularization(mu = [1.,1.], mu_c=1.)
62
63 print("Starting inversion, please stand by...")
64 try:
65 density, susceptibility = inv.run()
66 except MinimizerMaxIterReached as e:
67 print(e)
68 density, susceptibility = inv.p
69
70 print("density = %s"%density)
71 print("susceptibility = %s"%susceptibility)
72
73 # Save results
74 g, wg = inv.getCostFunction().getForwardModel(0).getSurvey()
75 B, wB = inv.getCostFunction().getForwardModel(1).getSurvey()
76 saveSilo("result_gravmag.silo", density=density, gravity_anomaly=g[2], gravity_weight=wg[2], susceptibility=susceptibility, magnetic_anomaly=B[2], magnetic_weight=wB[2])
77 print("Results saved in result_gravmag.silo. Good bye.")
78

  ViewVC Help
Powered by ViewVC 1.1.26