def modify_casa_headers(parset, casa_file):
table = pyrap_table(casa_file, ack=False)
origin_location = table.getkeyword("ATTRGROUPS")["LOFAR_ORIGIN"]
origin_table = pyrap_table(origin_location, ack=False, readonly=False)
for parset_field, value in parset.items():
if parset_field == "tau_time":
tau_time = value
print "setting tau_time to %s" % (tau_time)
starttime = origin_table.getcell("START", 0)
entime = starttime + tau_time
origin_table.putcell("END", 0, entime)
else:
print "WARNING: this script does not support setting %s for a CASA table" % parset_field
origin_table.close()
table.close()
def modify_lofarcasa_tau_time(parset, casa_file):
table = pyrap_table(casa_file, ack=False)
origin_location = table.getkeyword("ATTRGROUPS")['LOFAR_ORIGIN']
origin_table = pyrap_table(origin_location, ack=False, readonly=False)
for parset_field, value in parset.items():
if parset_field == 'tau_time':
tau_time = value
logger.info("setting tau_time to %s" % (tau_time))
starttime = origin_table.getcell('START', 0)
entime = starttime + tau_time
origin_table.putcell('END', 0, entime)
else:
raise ValueError("WARNING: this script does not support setting %s "
"for a CASA table" % parset_field)
origin_table.close()
table.close()
def modify_lofarcasa_tau_time(parset, casa_file):
table = pyrap_table(casa_file, ack=False)
origin_location = table.getkeyword("ATTRGROUPS")['LOFAR_ORIGIN']
origin_table = pyrap_table(origin_location, ack=False, readonly=False)
for parset_field, value in parset.items():
if parset_field == 'tau_time':
tau_time = value
logger.info("setting tau_time to %s" % (tau_time))
starttime = origin_table.getcell('START', 0)
entime = starttime + tau_time
origin_table.putcell('END', 0, entime)
else:
raise ValueError(
"WARNING: this script does not support setting %s "
"for a CASA table" % parset_field)
origin_table.close()
table.close()
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 = pyrap_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 = pyrap_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 pyrap 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] = pyrap_table(subtable_location, ack=False)
return subtables
def open_subtables(table):
"""open all subtables defined in the LOFAR format
args:
table: a pyrap table handler to a LOFAR CASA table
returns:
a dict containing all LOFAR CASA subtables
"""
subtables = {}
for subtable in subtable_names:
subtable_location = table.getkeyword("ATTRGROUPS")[subtable]
subtables[subtable] = pyrap_table(subtable_location, ack=False)
return subtables
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):
return False
try:
table = pyrap_table(filename.encode(), ack=False)
except RuntimeError:
return False
return True
def __init__(self, url, plane=0, beam=None):
super(LofarCasaImage, self).__init__(url, plane, beam)
table = pyrap_table(self.url.encode(), ack=False)
subtables = open_subtables(table)
self._taustart_ts = parse_taustartts(subtables)
self._tau_time = parse_tautime(subtables)
# Additional, LOFAR-specific metadata
self._antenna_set = parse_antennaset(subtables)
self._ncore, self._nremote, self._nintl = parse_stations(subtables)
self._subbandwidth = parse_subbandwidth(subtables)
self._subbands = parse_subbands(subtables)
def __init__(self, url, plane=0, beam=None):
self._url = url
table = pyrap_table(self.url.encode(), ack=False)
self._data = parse_data(table, plane)
self._wcs = parse_coordinates(table)
self._centre_ra, self._centre_decl = parse_phase_centre(table)
self._freq_eff, self._freq_bw = parse_frequency(table)
if beam:
(bmaj, bmin, bpa) = beam
self._beam = degrees2pixels(
bmaj, bmin, bpa, self.pixelsize[0], self.pixelsize[1]
)
else:
self._beam = parse_beam(table, self.pixelsize)
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 = pyrap_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 = pyrap_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
self.table = pyrap_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 __init__(self, url, plane=0, beam=None):
super(CasaImage, self).__init__()
self.url = url
self.table = pyrap_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 __init__(self, url, plane=0, beam=None):
super(CasaImage, self).__init__() # Set defaults
self.url = url
self.table = pyrap_table(self.url.encode(), ack=False)
self.telescope = self.table.getkeyword('coords')['telescope']
self.data = parse_data(self.table, plane)
self.wcs = parse_coordinates(self.table)
self.pixelsize = parse_pixelsize(self.wcs)
self.centre_ra, self.centre_decl = parse_phase_centre(self.table)
self.freq_eff, self.freq_bw = parse_frequency(self.table)
if beam:
(bmaj, bmin, bpa) = beam
self.beam = degrees2pixels(bmaj, bmin, bpa,
self.pixelsize[0], self.pixelsize[1])
else:
self.beam = parse_beam(self.table, self.pixelsize)
def __init__(self, url, plane=0, beam=None):
super(Kat7CasaImage, self).__init__(url, plane, beam)
table = pyrap_table(self.url.encode(), ack=False)
self._taustart_ts = parse_taustartts(table)
