def setUp(self):
self.dir = './test_results'
os.makedirs(self.dir, exist_ok=True)
self.lowcore = create_named_configuration('LOWBD2-CORE')
self.times = (numpy.pi / (12.0)) * numpy.linspace(-3.0, 3.0, 7)
self.frequency = numpy.array([1e8])
self.channel_bandwidth = numpy.array([1e6])
self.phasecentre = SkyCoord(ra=+180.0 * u.deg, dec=-60.0 * u.deg, frame='icrs', equinox=2000.0)
self.vis = create_visibility(self.lowcore, self.times, self.frequency,
channel_bandwidth=self.channel_bandwidth,
phasecentre=self.phasecentre, weight=1.0,
polarisation_frame=PolarisationFrame('stokesI'))
self.vis.data['vis'] *= 0.0
# Create model
self.test_model = create_test_image(cellsize=0.001, phasecentre=self.vis.phasecentre,
frequency=self.frequency)
self.vis = predict_2d(self.vis, self.test_model)
assert numpy.max(numpy.abs(self.vis.vis)) > 0.0
self.model = create_image_from_visibility(self.vis, npixel=512, cellsize=0.001,
polarisation_frame=PolarisationFrame('stokesI'))
self.dirty, sumwt = invert_2d(self.vis, self.model)
self.psf, sumwt = invert_2d(self.vis, self.model, dopsf=True)
window = numpy.zeros(shape=self.model.shape, dtype=numpy.bool)
window[..., 129:384, 129:384] = True
self.innerquarter = create_image_from_array(window, self.model.wcs)
def setUp(self):
self.lowcore = create_named_configuration('LOWBD2-CORE')
self.times = (numpy.pi / 43200.0) * numpy.arange(0.0, 300.0, 30.0)
self.frequency = numpy.linspace(1.0e8, 1.1e8, 3)
self.channel_bandwidth = numpy.array([1e7, 1e7, 1e7])
# Define the component and give it some spectral behaviour
f = numpy.array([100.0, 20.0, -10.0, 1.0])
self.flux = numpy.array([f, 0.8 * f, 0.6 * f])
# The phase centre is absolute and the component is specified relative (for now).
# This means that the component should end up at the position phasecentre+compredirection
self.phasecentre = SkyCoord(ra=+180.0 * u.deg,
dec=-35.0 * u.deg,
frame='icrs',
equinox=2000.0)
self.compabsdirection = SkyCoord(ra=+181.0 * u.deg,
dec=-35.0 * u.deg,
frame='icrs',
equinox=2000.0)
# self.compabsdirection = SkyCoord(ra=+182 * u.deg, dec=-36.5 * u.deg, frame='icrs', equinox=2000.0)
pcof = self.phasecentre.skyoffset_frame()
self.compreldirection = self.compabsdirection.transform_to(pcof)
self.comp = Skycomponent(direction=self.compreldirection,
frequency=self.frequency,
flux=self.flux)
def ingest_visibility(self, freq=None, chan_width=None, times=None, reffrequency=None, add_errors=False,
block=True):
if freq is None:
freq = [1e8]
if times is None:
ntimes = 5
times = numpy.linspace(-numpy.pi / 3.0, numpy.pi / 3.0, ntimes)
if chan_width is None:
chan_width = [1e6]
if reffrequency is None:
reffrequency = [1e8]
lowcore = create_named_configuration('LOWBD2-CORE')
frequency = numpy.array([freq])
channel_bandwidth = numpy.array([chan_width])
phasecentre = SkyCoord(ra=+180.0 * u.deg, dec=-60.0 * u.deg, frame='icrs', equinox='J2000')
if block:
vt = create_blockvisibility(lowcore, times, frequency, channel_bandwidth=channel_bandwidth,
weight=1.0, phasecentre=phasecentre,
polarisation_frame=PolarisationFrame("stokesI"))
else:
vt = create_visibility(lowcore, times, frequency, channel_bandwidth=channel_bandwidth,
weight=1.0, phasecentre=phasecentre,
polarisation_frame=PolarisationFrame("stokesI"))
cellsize = 0.001
model = create_image_from_visibility(vt, npixel=self.npixel, cellsize=cellsize, npol=1,
frequency=reffrequency, phasecentre=phasecentre,
polarisation_frame=PolarisationFrame("stokesI"))
flux = numpy.array([[100.0]])
facets = 4
rpix = model.wcs.wcs.crpix - 1.0
spacing_pixels = self.npixel // facets
centers = [-1.5, -0.5, 0.5, 1.5]
comps = list()
for iy in centers:
for ix in centers:
p = int(round(rpix[0] + ix * spacing_pixels * numpy.sign(model.wcs.wcs.cdelt[0]))), \
int(round(rpix[1] + iy * spacing_pixels * numpy.sign(model.wcs.wcs.cdelt[1])))
sc = pixel_to_skycoord(p[0], p[1], model.wcs, origin=1)
comp = create_skycomponent(flux=flux, frequency=frequency, direction=sc,
polarisation_frame=PolarisationFrame("stokesI"))
comps.append(comp)
if block:
predict_skycomponent_blockvisibility(vt, comps)
else:
predict_skycomponent_visibility(vt, comps)
insert_skycomponent(model, comps)
self.model = copy_image(model)
self.empty_model = create_empty_image_like(model)
export_image_to_fits(model, '%s/test_pipeline_bags_model.fits' % self.dir)
if add_errors:
# These will be the same for all calls
numpy.random.seed(180555)
gt = create_gaintable_from_blockvisibility(vt)
gt = simulate_gaintable(gt, phase_error=1.0, amplitude_error=0.0)
vt = apply_gaintable(vt, gt)
return vt
def setUp(self):
self.dir = './test_results'
os.makedirs(self.dir, exist_ok=True)
self.vnchan = 5
self.lowcore = create_named_configuration('LOWBD2-CORE')
self.times = (numpy.pi / 12.0) * numpy.linspace(-3.0, 3.0, 7)
self.frequency = numpy.linspace(8e7, 1.2e8, self.vnchan)
self.startfrequency = numpy.array([8e7])
self.channel_bandwidth = numpy.array(
self.vnchan * [self.frequency[1] - self.frequency[0]])
self.phasecentre = SkyCoord(ra=+180.0 * u.deg,
dec=-60.0 * u.deg,
frame='icrs',
equinox='J2000')
self.vis = create_visibility(
self.lowcore,
times=self.times,
frequency=self.frequency,
phasecentre=self.phasecentre,
weight=1.0,
polarisation_frame=PolarisationFrame('stokesI'),
channel_bandwidth=self.channel_bandwidth)
self.model = create_image_from_visibility(
self.vis,
npixel=512,
cellsize=0.001,
nchan=self.vnchan,
frequency=self.startfrequency)
def createVis(self, config, dec=-35.0):
self.config = create_named_configuration(config)
self.phasecentre = SkyCoord(ra=+15 * u.deg, dec=dec * u.deg, frame='icrs', equinox=2000.0)
self.vis = create_visibility(self.config, self.times, self.frequency,
channel_bandwidth=self.channel_bandwidth,
phasecentre=self.phasecentre, weight=1.0,
polarisation_frame=PolarisationFrame('stokesI'))
def setUp(self):
self.dir = './test_results'
self.lowcore = create_named_configuration('LOWBD2-CORE')
os.makedirs(self.dir, exist_ok=True)
self.times = (numpy.pi / (12.0)) * numpy.linspace(-3.0, 3.0, 7)
self.frequency = numpy.array([1e8])
self.channel_bandwidth = numpy.array([1e6])
self.phasecentre = SkyCoord(ra=+180.0 * u.deg,
dec=-60.0 * u.deg,
frame='icrs',
equinox='J2000')
self.vis = create_visibility(
self.lowcore,
self.times,
self.frequency,
channel_bandwidth=self.channel_bandwidth,
phasecentre=self.phasecentre,
weight=1.0,
polarisation_frame=PolarisationFrame('stokesI'))
self.vis.data['vis'] *= 0.0
# Create model
self.model = create_test_image(cellsize=0.0015,
phasecentre=self.vis.phasecentre,
frequency=self.frequency)
self.model.data[self.model.data > 1.0] = 1.0
self.vis = predict_2d(self.vis, self.model)
assert numpy.max(numpy.abs(self.vis.vis)) > 0.0
export_image_to_fits(
self.model, '%s/test_solve_skycomponent_model.fits' % (self.dir))
self.bigmodel = create_image_from_visibility(self.vis,
cellsize=0.0015,
npixel=512)
def setUp(self):
self.dir = './test_results'
os.makedirs(self.dir, exist_ok=True)
self.niter = 1000
self.lowcore = create_named_configuration('LOWBD2-CORE')
self.nchan = 5
self.times = (numpy.pi / 12.0) * numpy.linspace(-3.0, 3.0, 7)
self.frequency = numpy.linspace(0.9e8, 1.1e8, self.nchan)
self.channel_bandwidth = numpy.array(self.nchan * [self.frequency[1] - self.frequency[0]])
self.phasecentre = SkyCoord(ra=+0.0 * u.deg, dec=-45.0 * u.deg, frame='icrs', equinox='J2000')
self.vis = create_visibility(self.lowcore, self.times, self.frequency, self.channel_bandwidth,
phasecentre=self.phasecentre, weight=1.0,
polarisation_frame=PolarisationFrame('stokesI'))
self.vis.data['vis'] *= 0.0
# Create model
self.test_model = create_low_test_image_from_gleam(npixel=512, cellsize=0.001,
phasecentre=self.vis.phasecentre,
frequency=self.frequency,
channel_bandwidth=self.channel_bandwidth)
beam = create_low_test_beam(self.test_model)
export_image_to_fits(beam, "%s/test_deconvolve_msmfsclean_beam.fits" % self.dir)
self.test_model.data *= beam.data
export_image_to_fits(self.test_model, "%s/test_deconvolve_msmfsclean_model.fits" % self.dir)
self.vis = predict_2d(self.vis, self.test_model)
assert numpy.max(numpy.abs(self.vis.vis)) > 0.0
self.model = create_image_from_visibility(self.vis, npixel=512, cellsize=0.001,
polarisation_frame=PolarisationFrame('stokesI'))
self.dirty, sumwt = invert_2d(self.vis, self.model)
self.psf, sumwt = invert_2d(self.vis, self.model, dopsf=True)
export_image_to_fits(self.dirty, "%s/test_deconvolve_msmfsclean_dirty.fits" % self.dir)
export_image_to_fits(self.psf, "%s/test_deconvolve_msmfsclean_psf.fits" % self.dir)
window = numpy.ones(shape=self.model.shape, dtype=numpy.bool)
window[..., 129:384, 129:384] = True
self.innerquarter = create_image_from_array(window, self.model.wcs)
def setUp(self):
self.lowcore = create_named_configuration('LOWBD2-CORE')
self.times = (numpy.pi / 43200.0) * numpy.arange(0.0, 60.0, 30.0)
vnchan = 3
self.frequency = numpy.linspace(1.0e8, 1.1e8, vnchan)
self.channel_bandwidth = numpy.array(
vnchan * [self.frequency[1] - self.frequency[0]])
def actualSetUp(self,
time=None,
frequency=None,
dospectral=False,
dopol=False):
self.lowcore = create_named_configuration('LOWBD2-CORE')
self.times = (numpy.pi / 12.0) * numpy.linspace(-3.0, 3.0, 5)
if time is not None:
self.times = time
log.info("Times are %s" % (self.times))
if dospectral:
self.nchan = 3
self.frequency = numpy.array([0.9e8, 1e8, 1.1e8])
self.channel_bandwidth = numpy.array([1e7, 1e7, 1e7])
else:
self.frequency = numpy.array([1e8])
self.channel_bandwidth = numpy.array([1e7])
if dopol:
self.vis_pol = PolarisationFrame('linear')
self.image_pol = PolarisationFrame('stokesIQUV')
else:
self.vis_pol = PolarisationFrame('stokesI')
self.image_pol = PolarisationFrame('stokesI')
if dopol:
f = numpy.array([100.0, 20.0, -10.0, 1.0])
else:
f = numpy.array([100.0])
if dospectral:
numpy.array([f, 0.8 * f, 0.6 * f])
else:
numpy.array([f])
self.phasecentre = SkyCoord(ra=+180.0 * u.deg,
dec=-60.0 * u.deg,
frame='icrs',
equinox='J2000')
self.componentvis = create_visibility(
self.lowcore,
self.times,
self.frequency,
channel_bandwidth=self.channel_bandwidth,
phasecentre=self.phasecentre,
weight=1.0,
polarisation_frame=self.vis_pol)
self.uvw = self.componentvis.data['uvw']
self.componentvis.data['vis'] *= 0.0
# Create model
self.model = create_image_from_visibility(
self.componentvis,
npixel=512,
cellsize=0.001,
nchan=len(self.frequency),
polarisation_frame=self.image_pol)
def ingest_visibility(self,
freq=1e8,
chan_width=1e6,
times=None,
reffrequency=None,
add_errors=False):
if times is None:
times = (numpy.pi / 12.0) * numpy.linspace(-3.0, 3.0, 5)
if reffrequency is None:
reffrequency = [1e8]
lowcore = create_named_configuration('LOWBD2-CORE')
frequency = numpy.array([freq])
channel_bandwidth = numpy.array([chan_width])
phasecentre = SkyCoord(ra=+180.0 * u.deg,
dec=-60.0 * u.deg,
frame='icrs',
equinox='J2000')
vt = create_visibility(lowcore,
times,
frequency,
channel_bandwidth=channel_bandwidth,
weight=1.0,
phasecentre=phasecentre,
polarisation_frame=PolarisationFrame("stokesI"))
cellsize = 0.001
model = create_image_from_visibility(
vt,
npixel=self.npixel,
cellsize=cellsize,
npol=1,
frequency=reffrequency,
phasecentre=phasecentre,
polarisation_frame=PolarisationFrame("stokesI"))
flux = numpy.array([[100.0]])
facets = 4
rpix = model.wcs.wcs.crpix
spacing_pixels = self.npixel // facets
centers = [-1.5, -0.5, 0.5, 1.5]
comps = list()
for iy in centers:
for ix in centers:
p = int(round(rpix[0] + ix * spacing_pixels * numpy.sign(model.wcs.wcs.cdelt[0]))), \
int(round(rpix[1] + iy * spacing_pixels * numpy.sign(model.wcs.wcs.cdelt[1])))
sc = pixel_to_skycoord(p[0], p[1], model.wcs, origin=0)
comp = create_skycomponent(
flux=flux,
frequency=frequency,
direction=sc,
polarisation_frame=PolarisationFrame("stokesI"))
comps.append(comp)
predict_skycomponent_visibility(vt, comps)
insert_skycomponent(model, comps)
self.model = copy_image(model)
export_image_to_fits(model,
'%s/test_bags_model.fits' % (self.results_dir))
return vt
def setUp(self):
self.dir = './test_results'
os.makedirs(self.dir, exist_ok=True)
lowcore = create_named_configuration('LOWBD2-CORE')
times = numpy.arange(-3.0, +3.0, 1.0) * numpy.pi / 12.0
vnchan = 8
frequency = numpy.linspace(0.8e8, 1.20e8, vnchan)
channel_bandwidth = numpy.array(vnchan * [frequency[1] - frequency[0]])
# Define the component and give it some polarisation and spectral behaviour
f = numpy.array([100.0, 20.0, -10.0, 1.0])
self.flux = numpy.array(
[f, 0.9 * f, 0.8 * f, 0.7 * f, 0.6 * f, 0.5 * f, 0.4 * f, 0.3 * f])
self.phasecentre = SkyCoord(ra=+15.0 * u.deg,
dec=-35.0 * u.deg,
frame='icrs',
equinox='J2000')
self.compabsdirection = SkyCoord(ra=17.0 * u.deg,
dec=-36.5 * u.deg,
frame='icrs',
equinox='J2000')
self.comp = create_skycomponent(flux=self.flux,
frequency=frequency,
direction=self.compabsdirection)
self.image = create_test_image(
frequency=frequency,
phasecentre=self.phasecentre,
cellsize=0.001,
polarisation_frame=PolarisationFrame('stokesIQUV'))
self.blockvis = create_blockvisibility_iterator(
lowcore,
times=times,
frequency=frequency,
channel_bandwidth=channel_bandwidth,
phasecentre=self.phasecentre,
weight=1,
polarisation_frame=PolarisationFrame('linear'),
integration_time=1.0,
number_integrations=1,
predict=predict_2d,
components=self.comp,
phase_error=0.1,
amplitude_error=0.01,
sleep=1.0)
self.vis = create_blockvisibility(
lowcore,
times=times,
frequency=frequency,
channel_bandwidth=channel_bandwidth,
phasecentre=self.phasecentre,
weight=1,
polarisation_frame=PolarisationFrame('stokesIQUV'),
integration_time=1.0)
self.vis = predict_2d(self.vis, self.image)
def setUp(self):
self.lowcore = create_named_configuration('LOWBD2-CORE')
self.times = numpy.linspace(-300.0, 300.0, 11) * numpy.pi / 43200.0
self.frequency = numpy.array([1e8])
self.channel_bandwidth = numpy.array([1e8])
self.phasecentre = SkyCoord(ra=+15.0 * u.deg, dec=-35.0 * u.deg, frame='icrs', equinox='J2000')
def setUp(self):
self.lowcore = create_named_configuration('LOWBD2-CORE')
self.times = (numpy.pi / 43200.0) * numpy.arange(0.0, 30 * 3.76, 3.76)
df = 27343.75000
self.frequency = numpy.array([1e8 - df, 1e8, 1e8 + df])
self.channel_bandwidth = numpy.array([27343.75, 27343.75, 27343.75])
self.phasecentre = SkyCoord(ra=+0.0 * u.deg, dec=-35.0 * u.deg, frame='icrs', equinox='J2000')
self.blockvis = create_blockvisibility(self.lowcore, self.times, self.frequency, phasecentre=self.phasecentre,
weight=1.0, polarisation_frame=PolarisationFrame('stokesI'),
channel_bandwidth=self.channel_bandwidth)
def telescope_management_kernel(ixs, config, rmax):
'''
生成总的conf类，留待telescope_data_kernel进一步划分
:param ixs:
:return: iter[(key, conf)]
'''
ix = next(ixs)[0]
conf = create_named_configuration(config, rmax=rmax)
result = (ix, conf)
label = "Telescope Management (0.0 MB, 0.00 Tflop) "
print(label + str(result))
return iter([result])
def setUp(self):
self.dir = './test_results'
os.makedirs(self.dir, exist_ok=True)
self.frequency = numpy.linspace(1e8, 1.5e8, 3)
self.channel_bandwidth = numpy.array([2.5e7, 2.5e7, 2.5e7])
self.flux = numpy.array([[100.0], [100.0], [100.0]])
self.phasecentre = SkyCoord(ra=+15.0 * u.deg, dec=-35.0 * u.deg, frame='icrs', equinox=2000.0)
self.config = create_named_configuration('LOWBD2-CORE')
self.times = numpy.linspace(-300.0, 300.0, 3) * numpy.pi / 43200.0
nants = self.config.xyz.shape[0]
assert nants > 1
assert len(self.config.names) == nants
assert len(self.config.mount) == nants
def test_predict_sky_components_coalesce(self):
sc = create_low_test_skycomponents_from_gleam(flux_limit=10.0,
polarisation_frame=PolarisationFrame("stokesI"),
frequency=self.frequency, kind='cubic',
phasecentre=SkyCoord("17h20m31s", "-00d58m45s"),
radius=0.1)
self.config = create_named_configuration('LOWBD2-CORE')
self.phasecentre = SkyCoord("17h20m31s", "-00d58m45s")
sampling_time = 3.76
self.times = numpy.arange(0.0, + 300 * sampling_time, sampling_time)
self.vis = create_blockvisibility(self.config, self.times, self.frequency, phasecentre=self.phasecentre,
weight=1.0, polarisation_frame=PolarisationFrame('stokesI'),
channel_bandwidth=self.channel_bandwidth)
self.vis = predict_skycomponent_blockvisibility(self.vis, sc)
cvt = coalesce_visibility(self.vis, time_coal=1.0)
assert cvt.cindex is not None
def actualSetup(self,
sky_pol_frame='stokesIQUV',
data_pol_frame='linear',
f=None,
vnchan=3):
self.lowcore = create_named_configuration('LOWBD2-CORE')
self.times = (numpy.pi / 43200.0) * numpy.linspace(0.0, 30.0, 3)
self.frequency = numpy.linspace(1.0e8, 1.1e8, vnchan)
self.channel_bandwidth = numpy.array(
vnchan * [self.frequency[1] - self.frequency[0]])
if f is None:
f = [100.0, 50.0, -10.0, 40.0]
if sky_pol_frame == 'stokesI':
f = [100.0]
self.flux = numpy.outer(
numpy.array(
[numpy.power(freq / 1e8, -0.7) for freq in self.frequency]), f)
# The phase centre is absolute and the component is specified relative (for now).
# This means that the component should end up at the position phasecentre+compredirection
self.phasecentre = SkyCoord(ra=+180.0 * u.deg,
dec=-35.0 * u.deg,
frame='icrs',
equinox='J2000')
self.compabsdirection = SkyCoord(ra=+181.0 * u.deg,
dec=-35.0 * u.deg,
frame='icrs',
equinox='J2000')
self.comp = Skycomponent(
direction=self.compabsdirection,
frequency=self.frequency,
flux=self.flux,
polarisation_frame=PolarisationFrame(sky_pol_frame))
self.vis = create_blockvisibility(
self.lowcore,
self.times,
self.frequency,
phasecentre=self.phasecentre,
channel_bandwidth=self.channel_bandwidth,
weight=1.0,
polarisation_frame=PolarisationFrame(data_pol_frame))
self.vis = predict_skycomponent_visibility(self.vis, self.comp)
def ingest_visibility(self, freq=1e8, chan_width=1e6, times=None, reffrequency=None, add_errors=False):
if times is None:
times = [0.0]
if reffrequency is None:
reffrequency = [1e8]
lowcore = create_named_configuration('LOWBD2-CORE')
frequency = numpy.array([freq])
channel_bandwidth = numpy.array([chan_width])
# phasecentre = SkyCoord(ra=+180.0 * u.deg, dec=-60.0 * u.deg, frame='icrs', equinox='J2000')
# Observe at zenith to ensure that timeslicing works well. We test that elsewhere.
phasecentre = SkyCoord(ra=+180.0 * u.deg, dec=-60.0 * u.deg, frame='icrs', equinox='J2000')
vt = create_blockvisibility(lowcore, times, frequency, channel_bandwidth=channel_bandwidth,
weight=1.0, phasecentre=phasecentre,
polarisation_frame=PolarisationFrame("stokesI"))
cellsize = 0.001
model = create_image_from_visibility(vt, npixel=self.npixel, cellsize=cellsize, npol=1,
frequency=reffrequency,
polarisation_frame=PolarisationFrame("stokesI"))
flux = numpy.array([[100.0]])
facets = 4
rpix = model.wcs.wcs.crpix - 1.0
spacing_pixels = self.npixel // facets
centers = [-1.5, -0.5, 0.5, 1.5]
comps = list()
for iy in centers:
for ix in centers:
p = int(round(rpix[0] + ix * spacing_pixels * numpy.sign(model.wcs.wcs.cdelt[0]))), \
int(round(rpix[1] + iy * spacing_pixels * numpy.sign(model.wcs.wcs.cdelt[1])))
sc = pixel_to_skycoord(p[0], p[1], model.wcs, origin=1)
comps.append(create_skycomponent(flux=flux, frequency=vt.frequency, direction=sc,
polarisation_frame=PolarisationFrame("stokesI")))
predict_skycomponent_blockvisibility(vt, comps)
insert_skycomponent(model, comps)
self.actualmodel = copy_image(model)
export_image_to_fits(model, '%s/test_imaging_model.fits' % (self.results_dir))
if add_errors:
# These will be the same for all calls
numpy.random.seed(180555)
gt = create_gaintable_from_blockvisibility(vt)
gt = simulate_gaintable(gt, phase_error=1.0, amplitude_error=0.0)
vt = apply_gaintable(vt, gt)
return vt
def actualSetup(self):
self.lowcore = create_named_configuration('LOWBD2-CORE')
self.times = (numpy.pi / 43200.0) * numpy.arange(0.0, 300.0, 30.0)
self.times = [0.0]
self.frequency = numpy.linspace(1.0e8, 1.1e8, 1)
self.channel_bandwidth = numpy.array([1e7])
# Define the component and give it some spectral behaviour
f = numpy.array([100.0, 20.0, -10.0, 1.0])
self.flux = numpy.array([f, 0.8 * f, 0.6 * f])
f = numpy.array([100.0])
self.flux = numpy.array([f])
# The phase centre is absolute and the component is specified relative (for now).
# This means that the component should end up at the position phasecentre+compredirection
self.phasecentre = SkyCoord(ra=+180.0 * u.deg, dec=-35.0 * u.deg, frame='icrs', equinox='J2000')
self.comp_actual_direction = SkyCoord(ra=+180.2 * u.deg, dec=-35.1 * u.deg, frame='icrs', equinox='J2000')
self.comp_start_direction = SkyCoord(ra=+180.0 * u.deg, dec=-35.0 * u.deg, frame='icrs', equinox='J2000')
self.comp = Skycomponent(direction=self.comp_actual_direction, frequency=self.frequency, flux=self.flux,
polarisation_frame=PolarisationFrame("stokesI"))
def setUp(self):
self.dir = './test_results'
os.makedirs(self.dir, exist_ok=True)
self.lowcore = create_named_configuration('LOWBD2-CORE')
self.times = numpy.linspace(-3, +3, 13) * (numpy.pi / 12.0)
self.frequency = numpy.array([1e8])
self.channel_bandwidth = numpy.array([1e7])
# Define the component and give it some polarisation and spectral behaviour
f = numpy.array([100.0])
self.flux = numpy.array([f])
self.phasecentre = SkyCoord(ra=+15.0 * u.deg,
dec=-35.0 * u.deg,
frame='icrs',
equinox=2000.0)
self.compabsdirection = SkyCoord(ra=17.0 * u.deg,
dec=-36.5 * u.deg,
frame='icrs',
equinox=2000.0)
self.comp = create_skycomponent(
flux=self.flux,
frequency=self.frequency,
direction=self.compabsdirection,
polarisation_frame=PolarisationFrame('stokesI'))
self.image = create_test_image(
frequency=self.frequency,
phasecentre=self.phasecentre,
cellsize=0.001,
polarisation_frame=PolarisationFrame('stokesI'))
self.image.data[self.image.data < 0.0] = 0.0
self.image_graph = delayed(create_test_image)(
frequency=self.frequency,
phasecentre=self.phasecentre,
cellsize=0.001,
polarisation_frame=PolarisationFrame('stokesI'))
def setUp(self):
self.lowcore = create_named_configuration('LOWBD2-CORE')
self.times = (numpy.pi / 43200.0) * numpy.arange(0.0, 300.0, 30.0)
vnchan = 3
self.frequency = numpy.linspace(1.0e8, 1.1e8, vnchan)
self.channel_bandwidth = numpy.array(
vnchan * [self.frequency[1] - self.frequency[0]])
# Define the component and give it some spectral behaviour
f = numpy.array([100.0, 20.0, -10.0, 1.0])
self.flux = numpy.array([f, 0.8 * f, 0.6 * f])
# The phase centre is absolute and the component is specified relative (for now).
# This means that the component should end up at the position phasecentre+compredirection
self.phasecentre = SkyCoord(ra=+180.0 * u.deg,
dec=-35.0 * u.deg,
frame='icrs',
equinox='J2000')
self.compabsdirection = SkyCoord(ra=+181.0 * u.deg,
dec=-35.0 * u.deg,
frame='icrs',
equinox='J2000')
def actualSetup(self, sky_pol_frame='stokesIQUV', data_pol_frame='linear'):
self.lowcore = create_named_configuration('LOWBD2-CORE')
self.times = (numpy.pi / 43200.0) * numpy.arange(0.0, 300.0, 30.0)
vnchan = 3
self.frequency = numpy.linspace(1.0e8, 1.1e8, vnchan)
self.channel_bandwidth = numpy.array(
vnchan * [self.frequency[1] - self.frequency[0]])
# Define the component and give it some spectral behaviour
f = numpy.array([100.0, 20.0, -10.0, 1.0])
self.flux = numpy.array([f, 0.8 * f, 0.6 * f])
self.phasecentre = SkyCoord(ra=+180.0 * u.deg,
dec=-35.0 * u.deg,
frame='icrs',
equinox='J2000')
self.compabsdirection = SkyCoord(ra=+181.0 * u.deg,
dec=-35.0 * u.deg,
frame='icrs',
equinox='J2000')
if sky_pol_frame == 'stokesI':
self.flux = self.flux[:, 0][:, numpy.newaxis]
self.comp = Skycomponent(
direction=self.compabsdirection,
frequency=self.frequency,
flux=self.flux,
polarisation_frame=PolarisationFrame(sky_pol_frame))
self.vis = create_blockvisibility(
self.lowcore,
self.times,
self.frequency,
phasecentre=self.phasecentre,
channel_bandwidth=self.channel_bandwidth,
weight=1.0,
polarisation_frame=PolarisationFrame(data_pol_frame))
self.vis = predict_skycomponent_visibility(self.vis, self.comp)
def actualSetUp(self,
add_errors=False,
freqwin=7,
block=False,
dospectral=True,
dopol=False):
self.low = create_named_configuration('LOWBD2', rmax=750.0)
self.freqwin = freqwin
self.vis_graph_list = list()
self.ntimes = 5
self.times = numpy.linspace(-3.0, +3.0, self.ntimes) * numpy.pi / 12.0
self.frequency = numpy.linspace(0.8e8, 1.2e8, self.freqwin)
if freqwin > 1:
self.channelwidth = numpy.array(
freqwin * [self.frequency[1] - self.frequency[0]])
else:
self.channelwidth = numpy.array([1e6])
if dopol:
self.vis_pol = PolarisationFrame('linear')
self.image_pol = PolarisationFrame('stokesIQUV')
f = numpy.array([100.0, 20.0, -10.0, 1.0])
else:
self.vis_pol = PolarisationFrame('stokesI')
self.image_pol = PolarisationFrame('stokesI')
f = numpy.array([100.0])
if dospectral:
flux = numpy.array(
[f * numpy.power(freq / 1e8, -0.7) for freq in self.frequency])
else:
flux = numpy.array([f])
self.phasecentre = SkyCoord(ra=+180.0 * u.deg,
dec=-60.0 * u.deg,
frame='icrs',
equinox='J2000')
self.vis_graph_list = [
delayed(ingest_unittest_visibility)(self.low, [self.frequency[i]],
[self.channelwidth[i]],
self.times,
self.vis_pol,
self.phasecentre,
block=block)
for i, _ in enumerate(self.frequency)
]
self.model_graph = [
delayed(create_unittest_model,
nout=freqwin)(self.vis_graph_list[0],
self.image_pol,
npixel=self.params['npixel'])
for i, _ in enumerate(self.frequency)
]
self.components_graph = [
delayed(create_unittest_components)(self.model_graph[i],
flux[i, :][numpy.newaxis, :])
for i, _ in enumerate(self.frequency)
]
# Apply the LOW primary beam and insert into model
self.model_graph = [
delayed(insert_skycomponent,
nout=1)(self.model_graph[freqwin],
self.components_graph[freqwin])
for freqwin, _ in enumerate(self.frequency)
]
self.vis_graph_list = [
delayed(predict_skycomponent_visibility)(
self.vis_graph_list[freqwin], self.components_graph[freqwin])
for freqwin, _ in enumerate(self.frequency)
]
# Calculate the model convolved with a Gaussian.
model = self.model_graph[0].compute()
self.cmodel = smooth_image(model)
export_image_to_fits(model,
'%s/test_imaging_delayed_model.fits' % self.dir)
export_image_to_fits(self.cmodel,
'%s/test_imaging_delayed_cmodel.fits' % self.dir)
if add_errors and block:
self.vis_graph_list = [
delayed(insert_unittest_errors)(self.vis_graph_list[i])
for i, _ in enumerate(self.frequency)
]
def create_simulate_vis_graph(config='LOWBD2-CORE',
phasecentre=SkyCoord(ra=+15.0 * u.deg,
dec=-60.0 * u.deg,
frame='icrs',
equinox='J2000'),
frequency=None,
channel_bandwidth=None,
times=None,
polarisation_frame=PolarisationFrame("stokesI"),
order='frequency',
format='blockvis',
rmax=1000.0) -> delayed:
""" Create a graph to simulate an observation
The simulation step can generate a single BlockVisibility or a list of BlockVisibility's.
The parameter keyword determines the way that the list is constructed.
If order='frequency' then len(frequency) BlockVisibility's with all times are created.
If order='time' then len(times) BlockVisibility's with all frequencies are created.
If order = 'both' then len(times) * len(times) BlockVisibility's are created each with
a single time and frequency. If order = None then all data are created in one BlockVisibility.
The output format can be either 'blockvis' (for calibration) or 'vis' (for imaging)
:param config: Name of configuration: def LOWBDS-CORE
:param phasecentre: Phase centre def: SkyCoord(ra=+15.0 * u.deg, dec=-60.0 * u.deg, frame='icrs', equinox='J2000')
:param frequency: def [1e8]
:param channel_bandwidth: def [1e6]
:param times: Observing times in radians: def [0.0]
:param polarisation_frame: def PolarisationFrame("stokesI")
:param order: 'time' or 'frequency' or 'both' or None: def 'frequency'
:param format: 'blockvis' or 'vis': def 'blockvis'
:param kwargs:
:return: vis_graph_list with different frequencies in different elements
"""
if format == 'vis':
create_vis = create_visibility
else:
create_vis = create_blockvisibility
if times is None:
times = [0.0]
if channel_bandwidth is None:
channel_bandwidth = [1e6]
if frequency is None:
frequency = [1e8]
conf = create_named_configuration(config, rmax=rmax)
if order == 'time':
log.debug("create_simulate_vis_graph: Simulating distribution in %s" %
order)
vis_graph_list = list()
for i, time in enumerate(times):
vis_graph_list.append(
delayed(create_vis,
nout=1)(conf, [times[i]],
frequency=frequency,
channel_bandwidth=channel_bandwidth,
weight=1.0,
phasecentre=phasecentre,
polarisation_frame=polarisation_frame))
elif order == 'frequency':
log.debug("create_simulate_vis_graph: Simulating distribution in %s" %
order)
vis_graph_list = list()
for j, _ in enumerate(frequency):
vis_graph_list.append(
delayed(create_vis,
nout=1)(conf,
times,
frequency=[frequency[j]],
channel_bandwidth=[channel_bandwidth[j]],
weight=1.0,
phasecentre=phasecentre,
polarisation_frame=polarisation_frame))
elif order == 'both':
log.debug(
"create_simulate_vis_graph: Simulating distribution in time and frequency"
)
vis_graph_list = list()
for i, _ in enumerate(times):
for j, _ in enumerate(frequency):
vis_graph_list.append(
delayed(create_vis,
nout=1)(conf, [times[i]],
frequency=[frequency[j]],
channel_bandwidth=[channel_bandwidth[j]],
weight=1.0,
phasecentre=phasecentre,
polarisation_frame=polarisation_frame))
elif order is None:
log.debug("create_simulate_vis_graph: Simulating into single %s" %
format)
vis_graph_list = list()
vis_graph_list.append(
delayed(create_vis, nout=1)(conf,
times,
frequency=frequency,
channel_bandwidth=channel_bandwidth,
weight=1.0,
phasecentre=phasecentre,
polarisation_frame=polarisation_frame))
else:
raise NotImplementedError("order $s not known" % order)
return vis_graph_list
def actualSetUp(self, time=None, frequency=None):
self.lowcore = create_named_configuration('LOWBD2-CORE')
self.times = (numpy.pi / (12.0)) * numpy.linspace(-3.0, 3.0, 7)
if time is not None:
self.times = time
log.info("Times are %s" % (self.times))
if frequency is None:
self.frequency = numpy.array([1e8])
self.channel_bandwidth = numpy.array([1e7])
else:
self.frequency = frequency
if len(self.frequency) < 1:
self.channel_bandwidth = numpy.full_like(
self.frequency, self.frequency[1] - self.frequency[0])
else:
self.channel_bandwidth = numpy.array([1e6])
self.phasecentre = SkyCoord(ra=+180.0 * u.deg,
dec=-60.0 * u.deg,
frame='icrs',
equinox=2000.0)
self.componentvis = create_visibility(
self.lowcore,
self.times,
self.frequency,
channel_bandwidth=self.channel_bandwidth,
phasecentre=self.phasecentre,
weight=1.0,
polarisation_frame=PolarisationFrame('stokesI'))
self.uvw = self.componentvis.data['uvw']
self.componentvis.data['vis'] *= 0.0
# Create model
self.model = create_image_from_visibility(
self.componentvis,
npixel=256,
cellsize=0.001,
nchan=1,
polarisation_frame=PolarisationFrame('stokesI'))
# Fill the visibility with exactly computed point sources. These are chosen to lie
# on grid points.
spacing_pixels = 32
log.info('Spacing in pixels = %s' % spacing_pixels)
centers = [-2.5, -0.5, 0.5, 2.5]
# Make the list of components
rpix = self.model.wcs.wcs.crpix - 1
self.components = []
for iy in centers:
for ix in centers:
if ix >= iy:
# The phase center in 0-relative coordinates is n // 2 so we centre the grid of
# components on ny // 2, nx // 2. The wcs must be defined consistently.
p = int(round(rpix[0] + ix * spacing_pixels * numpy.sign(self.model.wcs.wcs.cdelt[0]))), \
int(round(rpix[1] + iy * spacing_pixels * numpy.sign(self.model.wcs.wcs.cdelt[1])))
sc = pixel_to_skycoord(p[0],
p[1],
self.model.wcs,
origin=0)
log.info("Component at (%f, %f) [0-rel] %s" %
(p[0], p[1], str(sc)))
f = (100.0 + 1.0 * ix + iy * 10.0)
# Channel images
flux = numpy.array([[f]])
comp = create_skycomponent(
flux=flux,
frequency=[numpy.average(self.frequency)],
direction=sc,
polarisation_frame=PolarisationFrame('stokesI'))
self.components.append(comp)
# Predict the visibility from the components exactly. We always do this for each spectral channel
self.componentvis.data['vis'] *= 0.0
predict_skycomponent_visibility(self.componentvis, self.components)
insert_skycomponent(self.model, self.components)
# Calculate the model convolved with a Gaussian.
norm = 2.0 * numpy.pi
self.cmodel = copy_image(self.model)
self.cmodel.data[0, 0, :, :] = norm * convolve(
self.model.data[0, 0, :, :],
Gaussian2DKernel(1.0),
normalize_kernel=False)
export_image_to_fits(self.model, '%s/test_model.fits' % self.dir)
export_image_to_fits(self.cmodel, '%s/test_cmodel.fits' % self.dir)
def test_unknown_configuration(self):
with self.assertRaises(ValueError):
self.config = create_named_configuration("SKA1-OWL")
def test_clip_configuration(self):
for rmax in [
100.0, 3000.0, 1000.0, 3000.0, 10000.0, 30000.0, 100000.0
]:
self.config = create_named_configuration('LOWBD2', rmax=rmax)
assert self.config.size() > 0.0
def actualSetUp(self, time=None, dospectral=False, dopol=False):
self.lowcore = create_named_configuration('LOWBD2-CORE')
self.times = (numpy.pi / 12.0) * numpy.linspace(-3.0, 3.0, 5)
if time is not None:
self.times = time
log.info("Times are %s" % self.times)
if dospectral:
self.nchan = 3
self.frequency = numpy.array([0.9e8, 1e8, 1.1e8])
self.channel_bandwidth = numpy.array([1e7, 1e7, 1e7])
else:
self.frequency = numpy.array([1e8])
self.channel_bandwidth = numpy.array([1e7])
if dopol:
self.vis_pol = PolarisationFrame('linear')
self.image_pol = PolarisationFrame('stokesIQUV')
f = numpy.array([100.0, 20.0, -10.0, 1.0])
else:
self.vis_pol = PolarisationFrame('stokesI')
self.image_pol = PolarisationFrame('stokesI')
f = numpy.array([100.0])
if dospectral:
flux = numpy.array([f, 0.8 * f, 0.6 * f])
else:
flux = numpy.array([f])
self.phasecentre = SkyCoord(ra=+180.0 * u.deg,
dec=-60.0 * u.deg,
frame='icrs',
equinox='J2000')
self.componentvis = create_visibility(
self.lowcore,
self.times,
self.frequency,
channel_bandwidth=self.channel_bandwidth,
phasecentre=self.phasecentre,
weight=1.0,
polarisation_frame=self.vis_pol)
self.uvw = self.componentvis.data['uvw']
self.componentvis.data['vis'][...] = 0.0
# Create model
self.model = create_image_from_visibility(
self.componentvis,
npixel=self.params['npixel'],
cellsize=0.0005,
nchan=len(self.frequency),
polarisation_frame=self.image_pol)
# Fill the visibility with exactly computed point sources.
spacing_pixels = 512 // 8
log.info('Spacing in pixels = %s' % spacing_pixels)
centers = [(x, x) for x in numpy.linspace(-1.4, +1.4, 9)]
for x in numpy.linspace(-1.4, +1.4, 9):
centers.append((-x, x))
centers.append((0.5, 1.1))
centers.append((1e-7, 1e-7))
# Make the list of components
rpix = self.model.wcs.wcs.crpix
self.components = []
for center in centers:
ix, iy = center
# The phase center in 0-relative coordinates is n // 2 so we centre the grid of
# components on ny // 2, nx // 2. The wcs must be defined consistently.
p = int(round(rpix[0] + ix * spacing_pixels * numpy.sign(self.model.wcs.wcs.cdelt[0]))), \
int(round(rpix[1] + iy * spacing_pixels * numpy.sign(self.model.wcs.wcs.cdelt[1])))
sc = pixel_to_skycoord(p[0], p[1], self.model.wcs, origin=1)
log.info("Component at (%f, %f) [0-rel] %s" %
(p[0], p[1], str(sc)))
if ix != 0 and iy != 0:
# Channel images
comp = create_skycomponent(flux=flux,
frequency=self.frequency,
direction=sc,
polarisation_frame=self.image_pol)
self.components.append(comp)
# Predict the visibility from the components exactly
self.componentvis.data['vis'] *= 0.0
self.beam = create_low_test_beam(self.model)
self.components = apply_beam_to_skycomponent(self.components,
self.beam)
self.componentvis = predict_skycomponent_visibility(
self.componentvis, self.components)
self.model = insert_skycomponent(self.model, self.components)
# Calculate the model convolved with a Gaussian.
self.cmodel = smooth_image(self.model)
export_image_to_fits(self.model,
'%s/test_imaging_functions_model.fits' % self.dir)
export_image_to_fits(
self.cmodel, '%s/test_imaging_functions_cmodel.fits' % self.dir)
def actualSetUp(self,
add_errors=False,
freqwin=1,
block=False,
dospectral=True,
dopol=False):
self.low = create_named_configuration('LOWBD2', rmax=750.0)
self.freqwin = freqwin
self.vis_graph_list = list()
self.ntimes = 5
self.times = numpy.linspace(-3.0, +3.0, self.ntimes) * numpy.pi / 12.0
self.frequency = numpy.linspace(0.8e8, 1.2e8, self.freqwin)
if freqwin > 1:
self.channelwidth = numpy.array(
freqwin * [self.frequency[1] - self.frequency[0]])
else:
self.channelwidth = numpy.array([1e6])
if dopol:
self.vis_pol = PolarisationFrame('linear')
self.image_pol = PolarisationFrame('stokesIQUV')
f = numpy.array([100.0, 20.0, -10.0, 1.0])
else:
self.vis_pol = PolarisationFrame('stokesI')
self.image_pol = PolarisationFrame('stokesI')
f = numpy.array([100.0])
if dospectral:
flux = numpy.array(
[f * numpy.power(freq / 1e8, -0.7) for freq in self.frequency])
else:
flux = numpy.array([f])
self.phasecentre = SkyCoord(ra=+180.0 * u.deg,
dec=-60.0 * u.deg,
frame='icrs',
equinox='J2000')
self.componentvis = ingest_unittest_visibility(self.low,
self.frequency,
self.channelwidth,
self.times,
self.vis_pol,
self.phasecentre,
block=block)
self.model = create_unittest_model(self.componentvis,
self.image_pol,
npixel=self.params['npixel'])
self.components = create_unittest_components(self.model, flux)
self.model = insert_skycomponent(self.model, self.components)
self.componentvis.data['vis'][...] = 0.0
self.componentvis = predict_skycomponent_visibility(
self.componentvis, self.components)
self.cmodel = smooth_image(self.model)
export_image_to_fits(self.model,
'%s/test_imaging_functions_model.fits' % self.dir)
export_image_to_fits(
self.cmodel, '%s/test_imaging_functions_cmodel.fits' % self.dir)
if add_errors:
self.componentvis = insert_unittest_errors(self.componentvis)
def test_peel_skycomponent_blockvisibility(self):
df = 1e6
frequency = numpy.array([1e8 - df, 1e8, 1e8 + df])
channel_bandwidth = numpy.array([df, df, df])
# Define the component and give it some spectral behaviour
f = numpy.array([100.0, 20.0, -10.0, 1.0])
flux = numpy.array([f, 0.8 * f, 0.6 * f])
phasecentre = SkyCoord(0 * u.deg, -60.0 * u.deg)
config = create_named_configuration('LOWBD2-CORE')
peeldirection = SkyCoord(+15 * u.deg, -60.0 * u.deg)
times = numpy.linspace(-3.0, 3.0, 7) * numpy.pi / 12.0
# Make the visibility
vis = create_blockvisibility(
config,
times,
frequency,
phasecentre=phasecentre,
weight=1.0,
polarisation_frame=PolarisationFrame('linear'),
channel_bandwidth=channel_bandwidth)
vis.data['vis'][...] = 0.0
# First add in the source to be peeled.
peel = Skycomponent(direction=peeldirection,
frequency=frequency,
flux=flux,
polarisation_frame=PolarisationFrame("stokesIQUV"))
vis = predict_skycomponent_visibility(vis, peel)
# Make a gaintable and apply it to the visibility of the peeling source
gt = create_gaintable_from_blockvisibility(vis, timeslice='auto')
gt = simulate_gaintable(gt,
phase_error=0.01,
amplitude_error=0.01,
timeslice='auto')
gt.data['gain'] *= 0.3
vis = apply_gaintable(vis, gt, timeslice='auto')
# Now create a plausible field using the GLEAM sources
model = create_image_from_visibility(
vis,
cellsize=0.001,
frequency=frequency,
polarisation_frame=PolarisationFrame('stokesIQUV'))
bm = create_low_test_beam(model=model)
sc = create_low_test_skycomponents_from_gleam(
flux_limit=1.0,
polarisation_frame=PolarisationFrame("stokesIQUV"),
frequency=frequency,
kind='cubic',
phasecentre=phasecentre,
radius=0.1)
sc = apply_beam_to_skycomponent(sc, bm)
# Add in the visibility due to these sources
vis = predict_skycomponent_visibility(vis, sc)
assert numpy.max(numpy.abs(vis.vis)) > 0.0
# Now we can peel
vis, peel_gts = peel_skycomponent_blockvisibility(vis, peel)
assert len(peel_gts) == 1
residual = numpy.max(peel_gts[0].residual)
assert residual < 0.7, "Peak residual %.6f too large" % (residual)
im, sumwt = invert_timeslice(vis, model, timeslice='auto')
qa = qa_image(im)
assert numpy.abs(qa.data['max'] - 14.2) < 1.0, str(qa)
