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test_core.py
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test_core.py
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#!/usr/bin/env python
# -*- coding: utf-8 -*-
"""
The obspy.io.gcf.core test suite.
"""
import os
import unittest
import numpy as np
from obspy import read
from obspy.core import Stream, Trace, AttribDict
from obspy.core.util import NamedTemporaryFile
from obspy.core.utcdatetime import UTCDateTime
from obspy.io.gcf.core import _read_gcf, _write_gcf, merge_gcf_stream
EXPECTED = np.array([-49378, -49213, -49273, -49277, -49341, -49415, -49289,
-49309, -49277, -49381, -49441, -49276, -49331, -49268,
-49250, -49407, -49421, -49282, -49224, -49281],
dtype=np.int32)
class CoreTestCase(unittest.TestCase):
"""
Test cases for gcf core interface
"""
def setUp(self):
# directory where the test files are located
self.path = os.path.join(os.path.dirname(__file__), 'data')
def test_read_via_obspy(self):
"""
Read files via obspy.core.stream.read function.
"""
filename = os.path.join(self.path, '20160603_1955n.gcf')
# 1
st = read(filename)
st.verify()
self.assertEqual(len(st), 1)
self.assertEqual(st[0].stats.starttime,
UTCDateTime('2016-06-03T19:55:00.000000Z'))
self.assertEqual(st[0].stats.endtime,
UTCDateTime('2016-06-03T19:55:02.990000Z'))
self.assertEqual(len(st[0]), 300)
self.assertAlmostEqual(st[0].stats.sampling_rate, 100.0)
self.assertEqual(st[0].stats.channel, 'HHN')
self.assertEqual(st[0].stats.station, '6018')
np.testing.assert_array_equal(EXPECTED, st[0].data[:20])
def test_read_head_via_obspy(self):
"""
Read files via obspy.core.stream.read function.
"""
filename = os.path.join(self.path, '20160603_1955n.gcf')
# 1
st = read(filename, headonly=True)
self.assertEqual(len(st), 1)
self.assertEqual(st[0].stats.starttime,
UTCDateTime('2016-06-03T19:55:00.000000Z'))
self.assertEqual(st[0].stats.endtime,
UTCDateTime('2016-06-03T19:55:02.990000Z'))
self.assertEqual(st[0].stats.npts, 300)
self.assertAlmostEqual(st[0].stats.sampling_rate, 100.0)
self.assertEqual(st[0].stats.channel, 'HHN')
self.assertEqual(st[0].stats.station, '6018')
def test_read_via_module(self):
"""
Read files via obspy.io.gcf.core._read_gcf function.
"""
filename = os.path.join(self.path, '20160603_1955n.gcf')
# 1
st = _read_gcf(filename)
st.verify()
self.assertEqual(len(st), 1)
self.assertEqual(st[0].stats.starttime,
UTCDateTime('2016-06-03T19:55:00.000000Z'))
self.assertEqual(st[0].stats.endtime,
UTCDateTime('2016-06-03T19:55:02.990000Z'))
self.assertEqual(len(st[0]), 300)
self.assertAlmostEqual(st[0].stats.sampling_rate, 100.0)
self.assertEqual(st[0].stats.channel, 'HHN')
self.assertEqual(st[0].stats.station, '6018')
np.testing.assert_array_equal(EXPECTED, st[0].data[:20])
def test_read_head_via_module(self):
"""
Read files via obspy.io.gcf.core._read_gcf function.
"""
filename = os.path.join(self.path, '20160603_1955n.gcf')
# 1
st = _read_gcf(filename, headonly=True)
self.assertEqual(len(st), 1)
self.assertEqual(st[0].stats.starttime,
UTCDateTime('2016-06-03T19:55:00.000000Z'))
self.assertEqual(st[0].stats.endtime,
UTCDateTime('2016-06-03T19:55:02.990000Z'))
self.assertEqual(st[0].stats.npts, 300)
self.assertAlmostEqual(st[0].stats.sampling_rate, 100.0)
self.assertEqual(st[0].stats.channel, 'HHN')
self.assertEqual(st[0].stats.station, '6018')
def test_read_channel_prefix_via_obspy(self):
"""
Read files via obspy.core.stream.read function.
"""
filename = os.path.join(self.path, '20160603_1955n.gcf')
# 1
st = read(filename, headonly=True, channel_prefix="HN")
self.assertEqual(len(st), 1)
self.assertEqual(st[0].stats.starttime,
UTCDateTime('2016-06-03T19:55:00.000000Z'))
self.assertEqual(st[0].stats.endtime,
UTCDateTime('2016-06-03T19:55:02.990000Z'))
self.assertEqual(st[0].stats.npts, 300)
self.assertAlmostEqual(st[0].stats.sampling_rate, 100.0)
self.assertEqual(st[0].stats.channel, 'HNN')
self.assertEqual(st[0].stats.station, '6018')
def test_merge_gcf_stream(self):
"""
Read files via obspy.core.stream.read function.
"""
filename = os.path.join(self.path, '20160603_1955n.gcf')
# 1
st1 = read(filename, headonly=True, channel_prefix="HN")
st2 = st1.copy()
tr1 = st1[0].copy()
tr2 = st1[0].copy()
tr1.stats.starttime = UTCDateTime('2016-06-03T19:55:02.000000Z')
tr1.stats.npts = 100
tr2.stats.npts = 200
st2.traces = [tr1, tr2]
st2 = merge_gcf_stream(st2)
self.assertEqual(len(st1), len(st2))
self.assertEqual(st2[0].stats.starttime,
UTCDateTime('2016-06-03T19:55:00.000000Z'))
self.assertEqual(st2[0].stats.endtime,
UTCDateTime('2016-06-03T19:55:02.990000Z'))
self.assertEqual(st2[0].stats.npts, 300)
self.assertAlmostEqual(st2[0].stats.sampling_rate, 100.0)
self.assertEqual(st2[0].stats.channel, 'HNN')
self.assertEqual(st2[0].stats.station, '6018')
def test_sps_d(self):
"""
Read files via obspy.core.stream.read function.
"""
filename = os.path.join(self.path, '20160603_1910n.gcf')
# 1
st = read(filename, headonly=True, channel_prefix="HN")
self.assertEqual(len(st), 1)
self.assertEqual(st[0].stats.starttime,
UTCDateTime('2016-06-03T19:10:00.000000Z'))
self.assertEqual(st[0].stats.endtime,
UTCDateTime('2016-06-03T19:10:01.998000Z'))
self.assertEqual(st[0].stats.npts, 1000)
self.assertAlmostEqual(st[0].stats.sampling_rate, 500.0)
self.assertEqual(st[0].stats.channel, 'HNN')
self.assertEqual(st[0].stats.station, '6018')
def test_read_no_merge(self):
"""
test preserving individual blocks in file as is, i.e. do not
merge traces
"""
filename = os.path.join(self.path, '20160603_1910n.gcf')
st = read(filename, blockmerge=False, channel_prefix="HN")
self.assertEqual(len(st), 2)
# 1
self.assertEqual(st[0].stats.starttime,
UTCDateTime('2016-06-03T19:10:00.000000Z'))
self.assertEqual(st[0].stats.endtime,
UTCDateTime('2016-06-03T19:10:00.998000Z'))
self.assertEqual(st[0].stats.npts, 500)
self.assertAlmostEqual(st[0].stats.sampling_rate, 500.0)
self.assertEqual(st[0].stats.channel, 'HNN')
self.assertEqual(st[0].stats.station, '6018')
self.assertEqual(st[0].stats.gcf.FIC, -49345)
self.assertEqual(st[0].stats.gcf.RIC, -49952)
# 2
self.assertEqual(st[1].stats.starttime,
UTCDateTime('2016-06-03T19:10:01.000000Z'))
self.assertEqual(st[1].stats.endtime,
UTCDateTime('2016-06-03T19:10:01.998000Z'))
self.assertEqual(st[1].stats.npts, 500)
self.assertAlmostEqual(st[1].stats.sampling_rate, 500.0)
self.assertEqual(st[1].stats.channel, 'HNN')
self.assertEqual(st[1].stats.station, '6018')
self.assertEqual(st[1].stats.gcf.FIC, -49519)
self.assertEqual(st[1].stats.gcf.RIC, -49625)
def test_write_read_fractional_start(self):
"""
writes and (if succsesfull) re-reads a file with fractional
(non-integer) start time
"""
# 1
# set up a stream object with supported proper non-integer start time
sps = 1000
duration = 60
sysType = 1
nsamples = int(sps*duration)
data = np.random.randint(-3600, 3600, nsamples, dtype=np.int32)
gcf_stat = AttribDict({
"system_id": ("ABCDZ2")[:6-sysType],
"stream_id": 'XXXXZ2',
"sys_type": sysType,
"t_leap": 0,
"gain": -1 if sysType == 0 else 2,
"digi": 0,
"ttl": 27,
"blk": 0,
"FIC": data[0],
"RIC": data[-1],
"stat": 0
})
stats = {
"network": "XY",
"station": "ABCD",
"channel": "HHZ",
"sampling_rate": sps,
"starttime": UTCDateTime("20220301000000.250"),
"gcf": gcf_stat
}
out_stream = Stream(traces=Trace(data, header=stats))
# Write to temporary file, then re-read
with NamedTemporaryFile() as tf:
filename = tf.name
_write_gcf(out_stream, filename)
# Read temporary file
in_stream = _read_gcf(filename, network='XY',
station="ABCD", errorret=True)
# compare
self.assertEqual(out_stream, in_stream)
# 2
# adjust start time in stream object to be miss-aligned more
# than set tolerance
stats["starttime"] = UTCDateTime("20220301000000.25016")
out_stream = Stream(traces=Trace(data, header=stats))
# Try to write to temporary file, this should fail
with NamedTemporaryFile() as tf:
filename = tf.name
try:
_write_gcf(out_stream, filename, misalign=0.15)
except TypeError:
pass
else:
# Raise TypeError exception if this were successful
err = "write_gcf erroneously passed a miss-aligned " + \
"start time above set tolerance"
raise TypeError(err)
# 2
# adjust start time in stream object to be miss-aligned within
# set tolerance
stats["starttime"] = UTCDateTime("20220301000000.25015")
out_stream = Stream(traces=Trace(data, header=stats))
# Try to write to temporary file, this should fail
with NamedTemporaryFile() as tf:
filename = tf.name
_write_gcf(out_stream, filename, misalign=0.15)
def test_write_read(self):
"""
Writes a file then re-reads it and compares
"""
# Tests, write and read a series of 60 sec gcf files
for sysType in [0, 1, 2]:
for sps in [5000, 2000, 625, 250, 134, 100, 1, 0.1]:
# Set up a Stream object
duration = 60
nsamples = int(sps*duration)
data = np.random.randint(-3600, 3600, nsamples, dtype=np.int32)
gcf_stat = AttribDict({
"system_id": ("ABCDZ2")[:6-sysType],
"stream_id": 'XXXXZ2',
"sys_type": sysType,
"t_leap": 0,
"gain": -1 if sysType == 0 else 2,
"digi": 0,
"ttl": 27,
"blk": 0,
"FIC": data[0],
"RIC": data[-1],
"stat": 0
})
stats = {
"network": "XY",
"station": "ABCD",
"channel": "HHZ",
"sampling_rate": sps,
"starttime": UTCDateTime("20220301000000"),
"gcf": gcf_stat
}
out_stream = Stream(traces=Trace(data, header=stats))
# Write to temporary file, then re-read
with NamedTemporaryFile() as tf:
filename = tf.name
_write_gcf(out_stream, filename)
# Read temporary file
in_stream = _read_gcf(filename, network='XY',
station="ABCD", errorret=True)
# compare
self.assertEqual(out_stream, in_stream)