def __init__(self, url, plane=0, beam=None):
super(AartfaacCasaImage, self).__init__(url, plane=0, beam=None)
table = casacore_table(self.url.encode(), ack=False)
self.taustart_ts = self.parse_taustartts(table)
self.telescope = table.getkeyword('coords')['telescope']
# TODO: header does't contain integration time
# aartfaac imaginig pipeline issue #25
self.tau_time = 1
def casa_detect(filename):
"""
Detect which telescope produced CASA data, return corresponding accessor.
Checks for known CASA table types where we expect additional metadata.
If the telescope is unknown we return nothing.
"""
table = casacore_table(filename.encode(), ack=False)
telescope = table.getkeyword('coords')['telescope']
return casa_telescope_keyword_mapping.get(telescope, None)
def casa_detect(filename):
"""
Detect which telescope produced CASA data, return corresponding accessor.
Checks for known CASA table types where we expect additional metadata.
If the telescope is unknown we return nothing.
"""
table = casacore_table(filename.encode(), ack=False)
telescope = table.getkeyword('coords')['telescope']
return casa_telescope_keyword_mapping.get(telescope, None)
def open_subtables(self):
"""open all subtables defined in the LOFAR format
args:
table: a casacore table handler to a LOFAR CASA table
returns:
a dict containing all LOFAR CASA subtables
"""
subtables = {}
for subtable in subtable_names:
subtable_location = self.table.getkeyword("ATTRGROUPS")[subtable]
subtables[subtable] = casacore_table(subtable_location, ack=False)
return subtables
def __init__(self, url, plane=0, beam=None):
super(LofarCasaImage, self).__init__(url, plane, beam)
table = casacore_table(self.url.encode(), ack=False)
subtables = self.open_subtables(table)
self.taustart_ts = self.parse_taustartts(subtables)
self.tau_time = self.parse_tautime(subtables)
# Additional, LOFAR-specific metadata
self.antenna_set = self.parse_antennaset(subtables)
self.ncore, self.nremote, self.nintl = self.parse_stations(subtables)
self.subbandwidth = self.parse_subbandwidth(subtables)
self.subbands = self.parse_subbands(subtables)
def __init__(self, url, plane=0, beam=None):
super(CasaImage, self).__init__()
self.url = url
self.table = casacore_table(self.url.encode(), ack=False)
self.data = self.parse_data(plane)
self.wcs = self.parse_coordinates()
self.centre_ra, self.centre_decl = self.parse_phase_centre()
self.freq_eff, self.freq_bw = self.parse_frequency()
self.pixelsize = self.parse_pixelsize()
if beam:
(bmaj, bmin, bpa) = beam
else:
bmaj, bmin, bpa = self.parse_beam()
self.beam = self.degrees2pixels(
bmaj, bmin, bpa, self.pixelsize[0], self.pixelsize[1])
def iscasa(filename):
"""returns True if filename is a lofar casa directory"""
if not os.path.isdir(filename):
return False
for file_ in casafiles:
casafile = os.path.join(filename, file_)
if not os.path.isfile(casafile):
logger.debug("%s doesn't contain %s" % (filename, file_))
return False
try:
table = casacore_table(filename.encode(), ack=False)
table.close()
except RuntimeError as e:
logger.debug("directory looks casacore, but cannot open: %s" % str(e))
return False
return True
def iscasa(filename):
"""returns True if filename is a lofar casa directory"""
if not os.path.isdir(filename):
return False
for file_ in casafiles:
casafile = os.path.join(filename, file_)
if not os.path.isfile(casafile):
logger.debug("%s doesn't contain %s" % (filename, file_))
return False
try:
table = casacore_table(filename.encode(), ack=False)
table.close()
except RuntimeError as e:
logger.debug("directory looks casacore, but cannot open: %s" % str(e))
return False
return True
def __init__(self, url, plane=0, beam=None):
super(CasaImage, self).__init__()
self.url = url
# we don't want the table as a property since it makes the accessor
# not serializable
table = casacore_table(self.url.encode(), ack=False)
self.data = self.parse_data(table, plane)
self.wcs = self.parse_coordinates(table)
self.centre_ra, self.centre_decl = self.parse_phase_centre(table)
self.freq_eff, self.freq_bw = self.parse_frequency(table)
self.pixelsize = self.parse_pixelsize()
if beam:
(bmaj, bmin, bpa) = beam
else:
bmaj, bmin, bpa = self.parse_beam(table)
self.beam = self.degrees2pixels(
bmaj, bmin, bpa, self.pixelsize[0], self.pixelsize[1])
def __init__(self, url, plane=0, beam=None):
super(Kat7CasaImage, self).__init__(url, plane, beam)
table = casacore_table(self.url.encode(), ack=False)
self.taustart_ts = self.parse_taustartts(table)
self.tau_time = 1 # Placeholder value
def __init__(self, url, plane=0, beam=None):
super(Kat7CasaImage, self).__init__(url, plane, beam)
table = casacore_table(self.url, ack=False)
self.taustart_ts = self.parse_taustartts(table)
self.tau_time = 1 # Placeholder value
