/[escript]/trunk/doc/examples/inversion/mag_wgs84_netcdf.py
ViewVC logotype

Contents of /trunk/doc/examples/inversion/mag_wgs84_netcdf.py

Parent Directory Parent Directory | Revision Log Revision Log


Revision 5707 - (show annotations)
Mon Jun 29 03:59:06 2015 UTC (3 years, 6 months ago) by sshaw
File MIME type: text/x-python
File size: 3035 byte(s)
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 magnetic 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.weipa import *
29 from esys.escript import unitsSI as U
30 from esys.escript import saveDataCSV
31
32 # Set parameters
33 DATASET = 'data/MagneticSmall.nc'
34 DATA_UNITS = U.Nano * U.Tesla
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 = 0.1
41 # background magnetic field components (B_East, B_North, B_Vertical)
42 B_b = [2201.*U.Nano*U.Tesla, 31232.*U.Nano*U.Tesla, -41405.*U.Nano*U.Tesla]
43
44 COORDINATES=WGS84ReferenceSystem()
45
46
47 def work():
48 # Setup and run the inversion
49 source=NetCdfData(NetCdfData.MAGNETIC, DATASET, scale_factor=DATA_UNITS, reference_system=COORDINATES)
50 db=DomainBuilder(dim=3, reference_system=COORDINATES)
51 db.addSource(source)
52 db.setVerticalExtents(depth=thickness, air_layer=l_air, num_cells=n_cells_v)
53 db.setFractionalPadding(pad_x=PAD_X, pad_y=PAD_Y)
54 db.setBackgroundMagneticFluxDensity(B_b)
55 db.fixSusceptibilityBelow(depth=thickness)
56
57 inv=MagneticInversion(self_demagnetization=True)
58 inv.setSolverTolerance(1e-4)
59 inv.setSolverMaxIterations(50)
60 inv.fixMagneticPotentialAtBottom(False)
61 inv.setup(db)
62 inv.getCostFunction().setTradeOffFactorsModels(MU)
63
64 susceptibility = inv.run()
65 print("susceptibility = %s"%susceptibility)
66
67 B, w = db.getMagneticSurveys()[0]
68 if saveSilo("result_magnetic.silo", susceptibility=susceptibility, magnetic_anomaly=B, magnetic_weight=w):
69 print("Results saved in result_magnetic.silo")
70 else:
71 print("Failed to save result_magnetic.silo. Possibly no Silo support.")
72
73 saveVTK("result_magnetic.vtu", susceptibility=susceptibility, magnetic_anomaly=B, magnetic_weight=w)
74 print("Results saved in result_magnetic.vtu")
75
76 saveDataCSV("result_magnetic.csv", susceptibility=susceptibility, x=susceptibility.getFunctionSpace().getX())
77 print("Results saved in result_magnetic.csv")
78
79 print("All done. Have a nice day!")
80
81 if 'NetCdfData' in dir():
82 work()
83 else:
84 print("This example requires scipy's netcdf support which does not appear to be installed.")
85

  ViewVC Help
Powered by ViewVC 1.1.26