def testRunThrough(self):
# Set up chebyshev fitter.
tStart = self.orbits.orbits.epoch.iloc[0]
interval = 30
cheb = ChebyFits(self.orbits,
tStart,
interval,
ngran=64,
skyTolerance=2.5,
nDecimal=10)
# Set granularity. Use an value that will be too long, to trigger recursion below.
cheb.calcSegmentLength(length=10.0)
# Run through segments.
cheb.calcSegments()
self.assertEqual(len(np.unique(cheb.coeffs['objId'])),
len(self.orbits))
# Write outputs.
cheb.write(self.coeffFile, self.residFile, self.failedFile)
# Test that the segments for each individual object fit together start/end.
for k in cheb.coeffs:
cheb.coeffs[k] = np.array(cheb.coeffs[k])
for objId in np.unique(cheb.coeffs['objId']):
condition = (cheb.coeffs['objId'] == objId)
te_prev = tStart
for ts, te in zip(cheb.coeffs['tStart'][condition],
cheb.coeffs['tEnd'][condition]):
# Test that the start of the current interval = the end of the previous interval.
self.assertEqual(te_prev, ts)
te_prev = te
# Test that the end of the last interval is equal to the end of the total interval
self.assertEqual(te, tStart + interval)
def testRunThrough(self):
# Set up chebyshev fitter.
tStart = self.orbits.orbits.epoch.iloc[0]
interval = 30
cheb = ChebyFits(self.orbits, tStart, tStart + interval, ngran=64, skyTolerance=2.5, nDecimal=2)
# Set granularity. Use an value that will be too long, to trigger recursion below.
cheb.calcSegmentLength(length=10.0)
# Run through segments.
cheb.calcSegments()
self.assertEqual(len(np.unique(cheb.coeffs['objId'])), len(self.orbits))
# Write outputs.
cheb.write(self.coeffFile, self.residFile, self.failedFile)
# Test that the segments for each individual object fit together start/end.
for k in cheb.coeffs:
cheb.coeffs[k] = np.array(cheb.coeffs[k])
for objId in np.unique(cheb.coeffs['objId']):
condition = (cheb.coeffs['objId'] == objId)
te_prev = tStart
for ts, te in zip(cheb.coeffs['tStart'][condition], cheb.coeffs['tEnd'][condition]):
# Test that the start of the current interval = the end of the previous interval.
self.assertEqual(te_prev, ts)
te_prev = te
# Test that the end of the last interval is equal to the end of the total interval
self.assertEqual(te, tStart + interval)
class TestChebyValues(unittest.TestCase):
def setUp(self):
self.testdatadir = 'orbits_testdata'
self.coeffFile = 'test_coeffs'
self.residFile = 'test_resids'
self.failedFile = 'test_failed'
self.orbits = Orbits()
self.orbits.readOrbits(os.path.join(self.testdatadir, 'test_orbitsNEO.s3m'), skiprows=1)
self.pyephems = PyOrbEphemerides(os.path.join(os.getenv('OORB_DATA'), 'DE405.dat'))
self.pyephems.setOrbits(self.orbits)
self.tStart = self.orbits.orbits.epoch.iloc[0]
self.interval = 15
self.nCoeffs = 14
self.chebyFits = ChebyFits(self.orbits, self.tStart, self.tStart+self.interval, ngran=64,
skyTolerance=2.5, nDecimal=2, nCoeff_position=self.nCoeffs, obscode=807)
self.setLength = 0.5
self.chebyFits.calcSegmentLength(length=self.setLength)
self.chebyFits.calcSegments()
self.chebyFits.write(self.coeffFile, self.residFile, self.failedFile, append=False)
self.coeffKeys = ['objId', 'tStart', 'tEnd', 'ra', 'dec', 'delta', 'vmag', 'elongation']
def tearDown(self):
del self.orbits
del self.chebyFits
os.remove(self.coeffFile)
os.remove(self.residFile)
if os.path.isfile(self.failedFile):
os.remove(self.failedFile)
def testSetCoeff(self):
# Test setting coefficients directly from chebyFits outputs.
chebyValues = ChebyValues()
chebyValues.setCoefficients(self.chebyFits)
for k in self.coeffKeys:
self.assertTrue(k in chebyValues.coeffs)
self.assertTrue(isinstance(chebyValues.coeffs[k], np.ndarray))
self.assertEqual(len(np.unique(chebyValues.coeffs['objId'])), len(self.orbits))
# This will only be true for carefully selected length/orbit type, where subdivision did not occur.
# For the test MBAs, a len=1day will work. For the test NEOs, a len=0.25 day will work (with 2.5mas skyTol).
#self.assertEqual(len(chebyValues.coeffs['tStart']), (self.interval / self.setLength) * len(self.orbits))
self.assertEqual(len(chebyValues.coeffs['ra'][0]), self.nCoeffs)
self.assertTrue('meanRA' in chebyValues.coeffs)
self.assertTrue('meanDec' in chebyValues.coeffs)
def testReadCoeffs(self):
# Test reading the coefficients from disk.
chebyValues = ChebyValues()
chebyValues.readCoefficients(self.coeffFile)
chebyValues2 = ChebyValues()
chebyValues2.setCoefficients(self.chebyFits)
for k in chebyValues.coeffs:
if k == 'objId':
# Can't test strings with np.test.assert_almost_equal.
np.testing.assert_equal(chebyValues.coeffs[k], chebyValues2.coeffs[k])
else:
# All of these will only be accurate to 2 less decimal places than they are
# print out with in chebyFits. Since vmag, delta and elongation only use 7
# decimal places, this means we can test to 5 decimal places for those.
np.testing.assert_almost_equal(chebyValues.coeffs[k], chebyValues2.coeffs[k],
decimal=5)
def testGetEphemerides(self):
# Test that getEphemerides works and is accurate.
chebyValues = ChebyValues()
#chebyValues.setCoefficients(self.chebyFits)
chebyValues.readCoefficients(self.coeffFile)
time = self.tStart + self.interval / 2.0
# Test for all objects.
ephemerides = chebyValues.getEphemerides(time)
pyephemerides = self.pyephems.generateEphemerides(time, obscode=807,
timeScale='TAI', byObject=False)
# RA and Dec should agree to 2.5mas (skyTolerance above)
pos_residuals = np.sqrt((ephemerides['ra'] - pyephemerides['ra'][0]) ** 2 +
(ephemerides['dec'] - pyephemerides['dec'][0]) ** 2)
pos_residuals *= 3600.0 * 1000.0
self.assertTrue(np.max(pos_residuals) <= 2.5)
# Let's just look at the max residuals in all quantities.
for k in ('ra', 'dec', 'dradt', 'ddecdt', 'delta'):
resids = np.abs(ephemerides[k] - pyephemerides[k][0])
print 'max diff ', k, np.max(resids)
resids = np.abs(ephemerides['elongation'] - pyephemerides['solarelon'][0])
print 'max diff elongation', np.max(resids)
resids = np.abs(ephemerides['vmag'] - pyephemerides['magV'][0])
print 'max diff vmag', np.max(resids)
# Test this for a subset of the objects.
objIds = self.orbits.orbits.objId.head(3).as_matrix()
ephemerides = chebyValues.getEphemerides(time, objIds)
self.assertEqual(len(ephemerides['ra']), 3)
class TestJPLValues(unittest.TestCase):
# Test the interpolation-generated RA/Dec values against JPL generated RA/Dec values.
# The resulting errors should be similar to the errors reported from testEphemerides when testing against JPL values.
def setUp(self):
# Read orbits.
self.orbits = Orbits()
self.orbits.readOrbits('jpl_testdata/S0_n747.des', skiprows=1)
# Read JPL ephems.
self.jpl = pd.read_table('jpl_testdata/807_n747.txt', delim_whitespace=True)
# Add times in TAI and UTC, because.
t = Time(self.jpl['epoch_mjd'], format='mjd', scale='utc')
self.jpl['mjdTAI'] = t.tai.mjd
self.jpl['mjdUTC'] = t.utc.mjd
self.jpl = self.jpl.to_records(index=False)
# Generate interpolation coefficients for the time period in the JPL catalog.
self.coeffFile = 'test_coeffs'
self.residFile = 'test_resids'
self.failedFile = 'test_failed'
tStart = self.jpl['mjdTAI'].min() - 0.2
tEnd = np.max([self.jpl['mjdTAI'].max() + 0.2, tStart + 1])
self.chebyFits = ChebyFits(self.orbits, tStart, tEnd,
ngran=64, skyTolerance=2.5, nDecimal=14,
nCoeff_position=14, obscode=807)
self.chebyFits.calcSegmentLength()
self.chebyFits.calcSegments()
self.chebyFits.write(self.coeffFile, self.residFile, self.failedFile, append=False)
self.coeffKeys = ['objId', 'tStart', 'tEnd', 'ra', 'dec', 'delta', 'vmag', 'elongation']
self.chebyValues = ChebyValues()
self.chebyValues.readCoefficients(self.coeffFile)
def tearDown(self):
del self.orbits
del self.jpl
os.remove(self.coeffFile)
os.remove(self.residFile)
if os.path.isfile(self.failedFile):
os.remove(self.failedFile)
def testRADec(self):
# We won't compare Vmag, because this also needs information on trailing losses.
times = np.unique(self.jpl['mjdTAI'])
deltaObjId = np.zeros(len(times), bool)
deltaRA = np.zeros(len(times), float)
deltaDec = np.zeros(len(times), float)
for i, t in enumerate(times):
# Find the JPL objIds visible at this time.
j = self.jpl[np.where(self.jpl['mjdTAI'] == t)]
ephs = self.chebyValues.getEphemerides(t, j['objId'])
ephorder = np.argsort(ephs['objId'])
dRA = np.abs(ephs['ra'][ephorder] - j['ra_deg']) * 3600.0 * 1000.0
dDec = np.abs(ephs['dec'][ephorder] - j['dec_deg']) * 3600.0 * 1000.0
deltaRA[i] = dRA.max()
deltaDec[i] = dDec.max()
# Should be (given OOrb direct prediction):
# Much of the time we're closer than 1mas, but there are a few which hit higher values.
# This is consistent with the errors/values reported by oorb directly in testEphemerides.
self.assertTrue(np.max(deltaRA) < 18)
self.assertTrue(np.max(deltaDec) < 6)
self.assertTrue(np.std(deltaRA) < 2)
self.assertTrue(np.std(deltaDec) < 1)
print 'max JPL errors', deltaRA.max(), deltaDec.max()
print 'std of JPL errors', np.std(deltaRA), np.std(deltaDec)
class TestChebyValues(unittest.TestCase):
def setUp(self):
self.testdatadir = os.path.join(getPackageDir('sims_movingObjects'), 'tests/orbits_testdata')
self.scratch_dir = tempfile.mkdtemp(dir=ROOT, prefix='TestChebyValues-')
self.coeffFile = os.path.join(self.scratch_dir, 'test_coeffs')
self.residFile = os.path.join(self.scratch_dir, 'test_resids')
self.failedFile = os.path.join(self.scratch_dir, 'test_failed')
self.orbits = Orbits()
self.orbits.readOrbits(os.path.join(self.testdatadir, 'test_orbitsNEO.s3m'), skiprows=1)
self.pyephems = PyOrbEphemerides(os.path.join(os.getenv('OORB_DATA'), 'DE405.dat'))
self.pyephems.setOrbits(self.orbits)
self.tStart = self.orbits.orbits.epoch.iloc[0]
self.interval = 30
self.nCoeffs = 14
self.nDecimal = 13
self.chebyFits = ChebyFits(self.orbits, self.tStart, self.interval, ngran=64,
skyTolerance=2.5, nDecimal=self.nDecimal, nCoeff_position=self.nCoeffs,
obscode=807, timeScale='TAI')
self.setLength = 0.5
self.chebyFits.calcSegmentLength(length=self.setLength)
self.chebyFits.calcSegments()
self.chebyFits.write(self.coeffFile, self.residFile, self.failedFile, append=False)
self.coeffKeys = ['objId', 'tStart', 'tEnd', 'ra', 'dec', 'geo_dist', 'vmag', 'elongation']
def tearDown(self):
del self.orbits
del self.chebyFits
if os.path.exists(self.scratch_dir):
shutil.rmtree(self.scratch_dir)
def testSetCoeff(self):
# Test setting coefficients directly from chebyFits outputs.
chebyValues = ChebyValues()
chebyValues.setCoefficients(self.chebyFits)
for k in self.coeffKeys:
self.assertTrue(k in chebyValues.coeffs)
self.assertTrue(isinstance(chebyValues.coeffs[k], np.ndarray))
self.assertEqual(len(np.unique(chebyValues.coeffs['objId'])), len(self.orbits))
# This will only be true for carefully selected length/orbit type, where subdivision did not occur.
# For the test MBAs, a len=1day will work.
# For the test NEOs, a len=0.25 day will work (with 2.5mas skyTol).
# self.assertEqual(len(chebyValues.coeffs['tStart']),
# (self.interval / self.setLength) * len(self.orbits))
self.assertEqual(len(chebyValues.coeffs['ra'][0]), self.nCoeffs)
self.assertTrue('meanRA' in chebyValues.coeffs)
self.assertTrue('meanDec' in chebyValues.coeffs)
def testReadCoeffs(self):
# Test reading the coefficients from disk.
chebyValues = ChebyValues()
chebyValues.readCoefficients(self.coeffFile)
chebyValues2 = ChebyValues()
chebyValues2.setCoefficients(self.chebyFits)
for k in chebyValues.coeffs:
if k == 'objId':
# Can't test strings with np.test.assert_almost_equal.
np.testing.assert_equal(chebyValues.coeffs[k], chebyValues2.coeffs[k])
else:
# All of these will only be accurate to 2 less decimal places than they are
# print out with in chebyFits. Since vmag, delta and elongation only use 7
# decimal places, this means we can test to 5 decimal places for those.
np.testing.assert_allclose(chebyValues.coeffs[k], chebyValues2.coeffs[k], rtol=0, atol=1e-5)
def testGetEphemerides(self):
# Test that getEphemerides works and is accurate.
chebyValues = ChebyValues()
chebyValues.readCoefficients(self.coeffFile)
# Multiple times, all objects, all within interval.
tstep = self.interval/10.0
time = np.arange(self.tStart, self.tStart + self.interval, tstep)
# Test for a single time, but all the objects.
ephemerides = chebyValues.getEphemerides(time)
pyephemerides = self.pyephems.generateEphemerides(time, obscode=807,
timeScale='TAI', byObject=True)
# RA and Dec should agree to 2.5mas (skyTolerance above)
pos_residuals = np.sqrt((ephemerides['ra'] - pyephemerides['ra']) ** 2 +
((ephemerides['dec'] - pyephemerides['dec']) *
np.cos(np.radians(ephemerides['dec']))) ** 2)
pos_residuals *= 3600.0 * 1000.0
# Let's just look at the max residuals in all quantities.
for k in ('ra', 'dec', 'dradt', 'ddecdt', 'geo_dist'):
resids = np.abs(ephemerides[k] - pyephemerides[k])
if k != 'geo_dist':
resids *= 3600.0 * 1000.0
print('max diff', k, np.max(resids))
resids = np.abs(ephemerides['elongation'] - pyephemerides['solarelon'])
print('max diff elongation', np.max(resids))
resids = np.abs(ephemerides['vmag'] - pyephemerides['magV'])
print('max diff vmag', np.max(resids))
self.assertLessEqual(np.max(pos_residuals), 2.5)
# Test for single time, but for a subset of the objects.
objIds = self.orbits.orbits.objId.head(3).as_matrix()
ephemerides = chebyValues.getEphemerides(time, objIds)
self.assertEqual(len(ephemerides['ra']), 3)
# Test for time outside of segment range.
ephemerides = chebyValues.getEphemerides(self.tStart + self.interval * 2, objIds, extrapolate=False)
self.assertTrue(np.isnan(ephemerides['ra'][0]),
msg='Expected Nan for out of range ephemeris, got %.2e' %(ephemerides['ra'][0]))
class TestJPLValues(unittest.TestCase):
# Test the interpolation-generated RA/Dec values against JPL generated RA/Dec values.
# The resulting errors should be similar to the errors reported
# from testEphemerides when testing against JPL values.
def setUp(self):
# Read orbits.
self.orbits = Orbits()
self.jplDir = os.path.join(getPackageDir('sims_movingObjects'), 'tests/jpl_testdata')
self.orbits.readOrbits(os.path.join(self.jplDir, 'S0_n747.des'), skiprows=1)
# Read JPL ephems.
self.jpl = pd.read_table(os.path.join(self.jplDir, '807_n747.txt'), delim_whitespace=True)
# Add times in TAI and UTC, because.
t = Time(self.jpl['epoch_mjd'], format='mjd', scale='utc')
self.jpl['mjdTAI'] = t.tai.mjd
self.jpl['mjdUTC'] = t.utc.mjd
self.jpl = self.jpl.to_records(index=False)
# Generate interpolation coefficients for the time period in the JPL catalog.
self.scratch_dir = tempfile.mkdtemp(dir=ROOT, prefix='TestJPLValues-')
self.coeffFile = os.path.join(self.scratch_dir, 'test_coeffs')
self.residFile = os.path.join(self.scratch_dir, 'test_resids')
self.failedFile = os.path.join(self.scratch_dir, 'test_failed')
tStart = self.jpl['mjdTAI'].min() - 0.2
tEnd = self.jpl['mjdTAI'].max() + 0.2 - self.jpl['mjdTAI'].min()
self.chebyFits = ChebyFits(self.orbits, tStart, tEnd,
ngran=64, skyTolerance=2.5,
nDecimal=14, obscode=807)
self.chebyFits.calcSegmentLength()
self.chebyFits.calcSegments()
self.chebyFits.write(self.coeffFile, self.residFile, self.failedFile, append=False)
self.coeffKeys = ['objId', 'tStart', 'tEnd', 'ra', 'dec', 'geo_dist', 'vmag', 'elongation']
self.chebyValues = ChebyValues()
self.chebyValues.readCoefficients(self.coeffFile)
def tearDown(self):
del self.orbits
del self.jpl
if os.path.exists(self.scratch_dir):
shutil.rmtree(self.scratch_dir)
def testRADec(self):
# We won't compare Vmag, because this also needs information on trailing losses.
times = np.unique(self.jpl['mjdTAI'])
deltaRA = np.zeros(len(times), float)
deltaDec = np.zeros(len(times), float)
for i, t in enumerate(times):
# Find the JPL objIds visible at this time.
j = self.jpl[np.where(self.jpl['mjdTAI'] == t)]
ephs = self.chebyValues.getEphemerides(t, j['objId'])
ephorder = np.argsort(ephs['objId'])
# Sometimes I've had to reorder both, sometimes just the ephs. ??
jorder = np.argsort(j['objId'])
jorder = np.arange(0, len(jorder))
dRA = np.abs(ephs['ra'][ephorder][:,0] - j['ra_deg'][jorder]) * 3600.0 * 1000.0
dDec = np.abs(ephs['dec'][ephorder][:,0] - j['dec_deg'][jorder]) * 3600.0 * 1000.0
deltaRA[i] = dRA.max()
deltaDec[i] = dDec.max()
if deltaRA[i] > 18:
print(j['objId'], ephs['objId'])
print(j['ra_deg'])
print(ephs['ra'])
print(j['dec_deg'])
print(ephs['dec'])
# Should be (given OOrb direct prediction):
# Much of the time we're closer than 1mas, but there are a few which hit higher values.
# This is consistent with the errors/values reported by oorb directly in testEphemerides.
print('max JPL errors', deltaRA.max(), deltaDec.max())
print('std of JPL errors', np.std(deltaRA), np.std(deltaDec))
self.assertLess(np.max(deltaRA), 25)
self.assertLess(np.max(deltaDec), 10)
self.assertLess(np.std(deltaRA), 3)
self.assertLess(np.std(deltaDec), 2)
class TestChebyFits(unittest.TestCase):
def setUp(self):
self.testdir = 'orbits_testdata'
self.orbits = Orbits()
self.orbits.readOrbits(os.path.join(self.testdir, 'test_orbitsMBA.s3m'), skiprows=1)
self.cheb = ChebyFits(self.orbits, 54800, 54830, ngran=64, skyTolerance=2.5,
nDecimal=2, nCoeff_position=14)
self.assertEqual(self.cheb.ngran, 64)
def tearDown(self):
del self.orbits
del self.cheb
@classmethod
def tearDownClass(cls):
os.remove('tmpCoeff')
os.remove('tmpResids')
if os.path.isfile('tmpFailed'):
os.remove('tmpFailed')
def testPrecomputeMultipliers(self):
# Precompute multipliers is done as an automatic step in __init__.
# After setting up self.cheb, these multipliers should all exist.
for key in self.cheb.nCoeff:
self.assertTrue(key in self.cheb.multipliers)
def testSetSegmentLength(self):
# Expect MBAs with standard ngran and tolerance to have length ~2.0 days.
self.cheb.calcSegmentLength()
self.assertAlmostEqual(self.cheb.length, 2.0)
# Test that we can set it to other values which fit into the 30 day window.
self.cheb.calcSegmentLength(length=1.5)
self.assertEqual(self.cheb.length, 1.5)
# Test that we if we try to set it to a value which does not fit into the 30 day window,
# that the actual value used is different - and smaller.
self.cheb.calcSegmentLength(length=1.9)
self.assertTrue(self.cheb.length < 1.9)
# Test that we get a warning about the residuals if we try to set the length to be too long.
with warnings.catch_warnings(record=True) as w:
self.cheb.calcSegmentLength(length=5.0)
self.assertTrue(len(w), 1)
# Now check granularity works for other orbit types (which would have other standard lengths).
# Check for multiple orbit types.
for orbitFile in (['test_orbitsMBA.s3m', 'test_orbitsOuter.s3m', 'test_orbitsNEO.s3m']):
self.orbits.readOrbits(os.path.join(self.testdir, orbitFile), skiprows=1)
tStart = self.orbits.orbits['epoch'].iloc[0]
cheb = ChebyFits(self.orbits, tStart, tStart + 30, ngran=64, nDecimal=2)
# And that we should converge for a variety of other tolerances.
for skyTolerance in (2.5, 5.0, 10.0, 100.0, 1000.0, 20000.0):
cheb.skyTolerance = skyTolerance
cheb.calcSegmentLength()
pos_resid, ratio = cheb._testResiduals(cheb.length)
self.assertTrue(pos_resid < skyTolerance)
self.assertEqual((cheb.length * 100) % 1, 0)
#print 'final', orbitFile, skyTolerance, pos_resid, cheb.length, ratio
# And check for challenging 'impactors'.
for orbitFile in (['test_orbitsImpactors.s3m']):
self.orbits.readOrbits(os.path.join(self.testdir, orbitFile), skiprows=1)
tStart = self.orbits.orbits['epoch'].iloc[0]
cheb = ChebyFits(self.orbits, tStart, tStart + 30, ngran=64, nDecimal=10)
# And that we should converge for a variety of other tolerances.
for skyTolerance in (2.5, 10.0, 100.0):
cheb.skyTolerance = skyTolerance
cheb.calcSegmentLength()
pos_resid, ratio = cheb._testResiduals(cheb.length)
self.assertTrue(pos_resid < skyTolerance)
#print 'final', orbitFile, skyTolerance, pos_resid, cheb.length, ratio
def testSegments(self):
# Test that we can create segments.
self.cheb.calcSegmentLength(length=1.0)
times = self.cheb.getAllTimes()
self.cheb.generateEphemerides(times, verbose=False)
self.cheb.calcSegments()
# We expect calculated coefficients to have the following keys:
coeffKeys = ['objId', 'tStart', 'tEnd', 'ra', 'dec', 'delta', 'vmag', 'elongation']
for k in coeffKeys:
self.assertTrue(k in self.cheb.coeffs.keys())
# And in this case, we had a 30 day timespan with 1 day segments
# (one day segments should be more than enough to meet 2.5mas tolerance, so not subdivided)
self.assertEqual(len(self.cheb.coeffs['tStart']), 30*len(self.orbits))
# And we used 14 coefficients for ra and dec.
self.assertEqual(len(self.cheb.coeffs['ra'][0]), 14)
self.assertEqual(len(self.cheb.coeffs['dec'][0]), 14)
def testWrite(self):
# Test that we can write the output to files.
self.cheb.calcSegmentLength()
self.cheb.generateEphemerides(self.cheb.getAllTimes())
self.cheb.calcSegments()
self.cheb.write('tmpCoeff', 'tmpResids', 'tmpFailed')
self.assertTrue(os.path.isfile('tmpCoeff'))
self.assertTrue(os.path.isfile('tmpResids'))
class TestChebyFits(unittest.TestCase):
def setUp(self):
self.testdir = os.path.join(getPackageDir('sims_movingObjects'),
'tests/orbits_testdata')
self.orbits = Orbits()
self.orbits.readOrbits(os.path.join(self.testdir,
'test_orbitsMBA.s3m'),
skiprows=1)
self.cheb = ChebyFits(self.orbits,
54800,
30,
ngran=64,
skyTolerance=2.5,
nDecimal=10,
nCoeff_position=14)
self.assertEqual(self.cheb.ngran, 64)
def tearDown(self):
del self.orbits
del self.cheb
@classmethod
def tearDownClass(cls):
os.remove('tmpCoeff')
os.remove('tmpResids')
if os.path.isfile('tmpFailed'):
os.remove('tmpFailed')
def testPrecomputeMultipliers(self):
# Precompute multipliers is done as an automatic step in __init__.
# After setting up self.cheb, these multipliers should all exist.
for key in self.cheb.nCoeff:
self.assertTrue(key in self.cheb.multipliers)
def testSetSegmentLength(self):
# Expect MBAs with standard ngran and tolerance to have length ~2.0 days.
self.cheb.calcSegmentLength()
self.assertAlmostEqual(self.cheb.length, 2.0)
# Test that we can set it to other values which fit into the 30 day window.
self.cheb.calcSegmentLength(length=1.5)
self.assertEqual(self.cheb.length, 1.5)
# Test that we if we try to set it to a value which does not fit into the 30 day window,
# that the actual value used is different - and smaller.
self.cheb.calcSegmentLength(length=1.9)
self.assertTrue(self.cheb.length < 1.9)
# Test that we get a warning about the residuals if we try to set the length to be too long.
with warnings.catch_warnings(record=True) as w:
self.cheb.calcSegmentLength(length=5.0)
self.assertTrue(len(w), 1)
# Now check granularity works for other orbit types (which would have other standard lengths).
# Check for multiple orbit types.
for orbitFile in ([
'test_orbitsMBA.s3m', 'test_orbitsOuter.s3m',
'test_orbitsNEO.s3m'
]):
self.orbits.readOrbits(os.path.join(self.testdir, orbitFile),
skiprows=1)
tStart = self.orbits.orbits['epoch'].iloc[0]
cheb = ChebyFits(self.orbits, tStart, 30, ngran=64, nDecimal=2)
# And that we should converge for a variety of other tolerances.
for skyTolerance in (2.5, 5.0, 10.0, 100.0, 1000.0, 20000.0):
cheb.skyTolerance = skyTolerance
cheb.calcSegmentLength()
pos_resid, ratio = cheb._testResiduals(cheb.length)
self.assertTrue(pos_resid < skyTolerance)
self.assertEqual((cheb.length * 100) % 1, 0)
# print('final', orbitFile, skyTolerance, pos_resid, cheb.length, ratio)
# And check for challenging 'impactors'.
for orbitFile in (['test_orbitsImpactors.s3m']):
self.orbits.readOrbits(os.path.join(self.testdir, orbitFile),
skiprows=1)
tStart = self.orbits.orbits['epoch'].iloc[0]
cheb = ChebyFits(self.orbits, tStart, 30, ngran=64, nDecimal=10)
# And that we should converge for a variety of other tolerances.
for skyTolerance in (2.5, 10.0, 100.0):
cheb.skyTolerance = skyTolerance
cheb.calcSegmentLength()
pos_resid, ratio = cheb._testResiduals(cheb.length)
self.assertTrue(pos_resid < skyTolerance)
# print('final', orbitFile, skyTolerance, pos_resid, cheb.length, ratio)
def testSegments(self):
# Test that we can create segments.
self.cheb.calcSegmentLength(length=1.0)
times = self.cheb.makeAllTimes()
self.cheb.generateEphemerides(times, verbose=False)
self.cheb.calcSegments()
# We expect calculated coefficients to have the following keys:
coeffKeys = [
'objId', 'tStart', 'tEnd', 'ra', 'dec', 'delta', 'vmag',
'elongation'
]
for k in coeffKeys:
self.assertTrue(k in self.cheb.coeffs.keys())
# And in this case, we had a 30 day timespan with 1 day segments
# (one day segments should be more than enough to meet 2.5mas tolerance, so not subdivided)
self.assertEqual(len(self.cheb.coeffs['tStart']),
30 * len(self.orbits))
# And we used 14 coefficients for ra and dec.
self.assertEqual(len(self.cheb.coeffs['ra'][0]), 14)
self.assertEqual(len(self.cheb.coeffs['dec'][0]), 14)
def testWrite(self):
# Test that we can write the output to files.
self.cheb.calcSegmentLength()
self.cheb.generateEphemerides(self.cheb.makeAllTimes())
self.cheb.calcSegments()
self.cheb.write('tmpCoeff', 'tmpResids', 'tmpFailed')
self.assertTrue(os.path.isfile('tmpCoeff'))
self.assertTrue(os.path.isfile('tmpResids'))
cheb.calcSegmentLength(length=args.length)
except ValueError as ve:
cheb.length = None
for objId in subsetOrbits.orbits['objId'].as_matrix():
cheb.failed.append((objId, tStart, tEnd))
warnings.showwarning("Objid %s to %s (n %d to %d), segment %f to %f - error: %s"
% (subsetOrbits.orbits.objId.iloc[0],
subsetOrbits.orbits.objId.iloc[-1],
n, n + nObj, t, t + tSpan, ve.message),
UserWarning, "generateCoefficients.py", 132, file=log)
# Put this in a separate try/except block, because errors here can mask errors in the previous
# length determination stage otherwise.
if cheb.length is not None:
try:
cheb.calcSegments()
except ValueError as ve:
for objId in subsetOrbits.orbits['objId'].as_matrix():
cheb.failed.append((objId, tStart, tEnd))
warnings.showwarning("Objid %s to %s (n %d to %d), segment %f to %f - error: %s"
% (subsetOrbits.orbits.objId.iloc[0],
subsetOrbits.orbits.objId.iloc[-1],
n, n + nObj, t, t + tSpan, ve.message),
UserWarning, "generateCoefficients.py", 147, file=log)
# Write out coefficients.
cheb.write(coeffFile, residFile, failedFile, append=append)
append = True
print("ALL DONE", file=log)
cheb.calcSegmentLength(length=args.length)
except ValueError as ve:
cheb.length = None
for objId in subsetOrbits.orbits['objId'].as_matrix():
cheb.failed.append((objId, tStart, tEnd))
warnings.showwarning("Objid %s to %s (n %d to %d), segment %f to %f - error: %s"
% (subsetOrbits.orbits.objId.iloc[0],
subsetOrbits.orbits.objId.iloc[-1],
n, n + nObj, t, t + tSpan, ve.message),
UserWarning, "generateCoefficients.py", 132, file=log)
# Put this in a separate try/except block, because errors here can mask errors in the previous
# length determination stage otherwise.
if cheb.length is not None:
try:
cheb.calcSegments()
except ValueError as ve:
for objId in subsetOrbits.orbits['objId'].as_matrix():
cheb.failed.append((objId, tStart, tEnd))
warnings.showwarning("Objid %s to %s (n %d to %d), segment %f to %f - error: %s"
% (subsetOrbits.orbits.objId.iloc[0],
subsetOrbits.orbits.objId.iloc[-1],
n, n + nObj, t, t + tSpan, ve.message),
UserWarning, "generateCoefficients.py", 147, file=log)
# Write out coefficients.
cheb.write(coeffFile, residFile, failedFile, append=append)
append = True
print("ALL DONE", file=log)