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test_calibration.py
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test_calibration.py
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#!/usr/bin/env python
# -*- coding: utf-8 -*-
"""
The calibration test suite.
"""
import os
import unittest
import numpy as np
from obspy import read
from obspy.signal.calibration import rel_calib_stack
from obspy.core.util.misc import TemporaryWorkingDirectory
class CalibrationTestCase(unittest.TestCase):
"""
Calibration test case
"""
def setUp(self):
# directory where the test files are located
self.path = os.path.abspath(os.path.join(os.path.dirname(__file__),
'data'))
def test_relcal_sts2_vs_unknown(self):
"""
Test relative calibration of unknown instrument vs STS2 in the same
time range. Window length is set to 20 s, smoothing rate to 10.
"""
st1 = read(os.path.join(self.path, 'ref_STS2'))
st2 = read(os.path.join(self.path, 'ref_unknown'))
calfile = os.path.join(self.path, 'STS2_simp.cal')
with TemporaryWorkingDirectory():
freq, amp, phase = rel_calib_stack(st1, st2, calfile, 20,
smooth=10, save_data=True)
self.assertTrue(os.path.isfile("0438.EHZ.20.resp"))
self.assertTrue(os.path.isfile("STS2.refResp"))
freq_, amp_, phase_ = np.loadtxt("0438.EHZ.20.resp", unpack=True)
self.assertTrue(np.allclose(freq, freq_, rtol=1e-8, atol=1e-8))
self.assertTrue(np.allclose(amp, amp_, rtol=1e-8, atol=1e-8))
self.assertTrue(np.allclose(phase, phase_, rtol=1e-8, atol=1e-8))
# read in the reference responses
un_resp = np.loadtxt(os.path.join(self.path, 'unknown.resp'))
kn_resp = np.loadtxt(os.path.join(self.path, 'STS2.refResp'))
# bug resolved with 2f9876d, arctan was used which maps to
# [-pi/2, pi/2]. arctan2 or np.angle shall be used instead
# correct the test data by hand
un_resp[:, 2] = np.unwrap(un_resp[:, 2] * 2) / 2
if False:
import matplotlib.pyplot as plt
plt.plot(freq, un_resp[:, 2], 'b', label='reference', alpha=.8)
plt.plot(freq, phase, 'r', label='new', alpha=.8)
plt.xlim(-10, None)
plt.legend()
plt.show()
# test if freq, amp and phase match the reference values
np.testing.assert_array_almost_equal(freq, un_resp[:, 0],
decimal=4)
np.testing.assert_array_almost_equal(freq, kn_resp[:, 0],
decimal=4)
np.testing.assert_array_almost_equal(amp, un_resp[:, 1],
decimal=4)
# TODO: unknown why the first frequency mismatches so much
np.testing.assert_array_almost_equal(phase[1:], un_resp[1:, 2],
decimal=4)
def test_relcal_using_traces(self):
"""
Tests using traces instead of stream objects as input parameters.
"""
st1 = read(os.path.join(self.path, 'ref_STS2'))
st2 = read(os.path.join(self.path, 'ref_unknown'))
calfile = os.path.join(self.path, 'STS2_simp.cal')
# stream
freq, amp, phase = rel_calib_stack(st1, st2, calfile, 20, smooth=10,
save_data=False)
# traces
freq2, amp2, phase2 = rel_calib_stack(st1[0], st2[0], calfile, 20,
smooth=10, save_data=False)
np.testing.assert_array_almost_equal(freq, freq2, decimal=4)
np.testing.assert_array_almost_equal(amp, amp2, decimal=4)
np.testing.assert_array_almost_equal(phase, phase2, decimal=4)
def test_relcal_different_overlaps(self):
"""
Tests using different window overlap percentages.
Regression test for bug #1821.
"""
st1 = read(os.path.join(self.path, 'ref_STS2'))
st2 = read(os.path.join(self.path, 'ref_unknown'))
calfile = os.path.join(self.path, 'STS2_simp.cal')
def median_amplitude_plateau(freq, amp):
# resulting response is pretty much flat in this frequency range
return np.median(amp[(freq >= 0.3) & (freq <= 3)])
# correct results using default overlap fraction of 0.5
freq, amp, phase = rel_calib_stack(
st1, st2, calfile, 20, smooth=10, overlap_frac=0.5,
save_data=False)
amp_expected = median_amplitude_plateau(freq, amp)
for overlap in np.linspace(0.1, 0.9, 5):
freq2, amp2, phase2 = rel_calib_stack(
st1, st2, calfile, 20, smooth=10, overlap_frac=overlap,
save_data=False)
amp_got = median_amplitude_plateau(freq2, amp2)
percentual_difference = abs(
(amp_expected - amp_got) / amp_expected)
# make sure results are close for any overlap choice
self.assertTrue(percentual_difference < 0.01)
def test_relcal_using_dict(self):
"""
Tests using paz dictionary instead of a gse2 file.
"""
st1 = read(os.path.join(self.path, 'ref_STS2'))
st2 = read(os.path.join(self.path, 'ref_unknown'))
calfile = os.path.join(self.path, 'STS2_simp.cal')
calpaz = dict()
calpaz['poles'] = [-0.03677 + 0.03703j, -0.03677 - 0.03703j]
calpaz['zeros'] = [0 + 0j, 0 - 0j]
calpaz['sensitivity'] = 1500
# stream
freq, amp, phase = rel_calib_stack(st1, st2, calfile, 20, smooth=10,
save_data=False)
# traces
freq2, amp2, phase2 = rel_calib_stack(st1, st2, calpaz, 20,
smooth=10, save_data=False)
np.testing.assert_array_almost_equal(freq, freq2, decimal=4)
np.testing.assert_array_almost_equal(amp, amp2, decimal=4)
np.testing.assert_array_almost_equal(phase, phase2, decimal=4)