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##############################################################################
#
# Copyright (c) 2009-2018 by The University of Queensland
# http://www.uq.edu.au
#
# Primary Business: Queensland, Australia
# Licensed under the Apache License, version 2.0
# http://www.apache.org/licenses/LICENSE-2.0
#
# Development until 2012 by Earth Systems Science Computational Center (ESSCC)
# Development 2012-2013 by School of Earth Sciences
# Development from 2014 by Centre for Geoscience Computing (GeoComp)
#
##############################################################################
"""3D gravity inversion example using netCDF data"""
from __future__ import division, print_function
__copyright__="""Copyright (c) 2009-2018 by The University of Queensland
http://www.uq.edu.au
Primary Business: Queensland, Australia"""
__license__="""Licensed under the Apache License, version 2.0
http://www.apache.org/licenses/LICENSE-2.0"""
__url__="https://launchpad.net/escript-finley"
# Import required modules
from esys.downunder import *
from esys.weipa import *
from esys.escript import unitsSI as U
from esys.escript import saveDataCSV, hasFeature
# Set parameters
DATASET = 'data/GravitySmall.nc'
DATA_UNITS = 1e-6 * U.m/(U.sec**2)
PAD_X = 0.2
PAD_Y = 0.2
thickness = 40. * U.km
l_air = 6. * U.km
n_cells_v = 15
MU = 0.1
COORDINATES=CartesianReferenceSystem()
#COORDINATES=WGS84ReferenceSystem()
# Setup and run the inversion
def work():
source=NetCdfData(NetCdfData.GRAVITY, DATASET, scale_factor=DATA_UNITS, reference_system=COORDINATES)
db=DomainBuilder(dim=3, reference_system=COORDINATES)
db.addSource(source)
db.setVerticalExtents(depth=thickness, air_layer=l_air, num_cells=n_cells_v)
db.setFractionalPadding(pad_x=PAD_X, pad_y=PAD_Y)
db.fixDensityBelow(depth=thickness)
inv=GravityInversion()
inv.setSolverTolerance(1e-4)
inv.setSolverMaxIterations(100)
inv.setup(db)
inv.getCostFunction().setTradeOffFactorsModels(MU)
density = inv.run()
print("density = %s"%density)
g, w = db.getGravitySurveys()[0]
saveVoxet("result.vo", density=density)
if saveSilo("result_gravity.silo", density=density, gravity_anomaly=g, gravity_weight=w):
print("Results saved in result_gravity.silo")
else:
print("Failed to save result_gravity.silo. Possibly no Silo support.")
saveVTK("result_gravity.vtu", density=density, gravity_anomaly=g, gravity_weight=w)
print("Results saved in result_gravity.vtu")
saveDataCSV("result_gravity.csv", density=density, x=density.getFunctionSpace().getX())
print("Results saved in result_gravity.csv")
print("All done. Have a nice day!")
try:
import pyproj
HAVE_PYPROJ = True
except ImportError:
HAVE_PYPROJ = False
try:
import esys.ripley
HAVE_RIPLEY = True
except ImportError:
HAVE_RIPLEY = False
if not hasFeature('netcdf'):
print("This example requires scipy's netcdf support which does not appear to be installed.")
elif not HAVE_RIPLEY:
print("Ripley module not available")
elif not HAVE_PYPROJ:
print("This example requires pyproj to be installed.")
else:
work()
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