def get_coord_system_name(self, header):
coordsys = common.get_coord_system_name(header)
coordsys = coordsys.upper()
if coordsys in ('FK4',):
return 'b1950'
elif coordsys in ('FK5', 'ICRS'):
return 'j2000'
elif coordsys in ('PIXEL',):
return 'pixel'
#raise common.WCSError("Cannot determine appropriate coordinate system from FITS header") # noqa
return 'j2000'
def get_coord_system_name(self, header):
coordsys = common.get_coord_system_name(header)
coordsys = coordsys.upper()
if coordsys in ('FK4',):
return 'b1950'
elif coordsys in ('FK5', 'ICRS'):
return 'j2000'
elif coordsys in ('PIXEL',):
return 'pixel'
#raise common.WCSError("Cannot determine appropriate coordinate system from FITS header") # noqa
return 'j2000'
def load_header(self, header, fobj=None):
try:
# reconstruct a pyfits header, because otherwise we take an
# incredible performance hit in astropy.wcs
self.logger.debug("Reconstructing PyFITS header")
self.header = pyfits.Header(header.items())
self.logger.debug("Trying to make astropy-- wcs object")
self.wcs = pywcs.WCS(self.header, fobj=fobj, relax=True)
self.logger.debug("made astropy wcs object")
self.coordsys = common.get_coord_system_name(self.header)
self.logger.debug("Coordinate system is: %s" % (self.coordsys))
except Exception as e:
self.logger.error("Error making WCS object: %s" % (str(e)))
self.wcs = None
def load_header(self, header, fobj=None):
try:
# reconstruct a FITS because otherwise we take an
# incredible performance hit in astropy.wcs
self.logger.debug("Reconstructing astropy.io.fits header")
self.header = fits.Header(header.items())
self.logger.debug("Trying to make astropy-- wcs object")
self.wcs = wcs.WCS(self.header, fobj=fobj, relax=True)
self.logger.debug("made astropy wcs object")
self.coordsys = common.get_coord_system_name(self.header)
self.logger.debug("Coordinate system is: {}".format(self.coordsys))
except Exception as e:
self.logger.error("Error making WCS object: {}".format(str(e)))
self.wcs = None
def load_header(self, header, fobj=None):
# For kapteyn, header just needs to be duck-typed like a dict
self.header = {}
self.header.update(header.items())
self.fix_bad_headers()
try:
self.logger.debug("Trying to make kapteyn wcs object")
self.wcs = kapwcs.Projection(self.header, skyout=self._skyout)
self.coordsys = common.get_coord_system_name(self.header)
self.logger.debug("Coordinate system is: %s" % (self.coordsys))
except Exception as e:
self.logger.error("Error making WCS object: %s" % (str(e)))
self.wcs = None
def load_header(self, header, fobj=None):
# For kapteyn, header just needs to be duck-typed like a dict
self.header = {}
self.header.update(header.items())
self.fix_bad_headers()
try:
self.logger.debug("Trying to make kapteyn wcs object")
self.wcs = kapwcs.Projection(self.header,
skyout=self._skyout)
self.coordsys = common.get_coord_system_name(self.header)
self.logger.debug("Coordinate system is: %s" % (self.coordsys))
except Exception as e:
self.logger.error("Error making WCS object: %s" % (str(e)))
self.wcs = None
def load_header(self, header, fobj=None):
from astropy.wcs.utils import wcs_to_celestial_frame
try:
# reconstruct a pyfits header, because otherwise we take an
# incredible performance hit in astropy.wcs
self.header = pyfits.Header(header.items())
self.logger.debug("Trying to make astropy wcs object")
self.wcs = pywcs.WCS(self.header, fobj=fobj, relax=True)
try:
self.coordframe = wcs_to_celestial_frame(self.wcs)
except ValueError:
sysname = common.get_coord_system_name(self.header)
if sysname in ('raw', 'pixel'):
self.coordframe = sysname
else:
raise
except Exception as e:
self.logger.error("Error making WCS object: %s" % (str(e)))
self.wcs = None
def load_nddata(self, ndd):
try:
# reconstruct a pyfits header, because otherwise we take an
# incredible performance hit in astropy.wcs
self.logger.debug("Reconstructing astropy.io.fits header")
self.header = pyfits.Header(ndd.meta)
if ndd.wcs is None:
self.logger.debug("Trying to make astropy FITS WCS object")
self.wcs = pywcs.WCS(self.header, relax=True)
self.logger.debug("made astropy wcs object")
else:
self.logger.debug("reused nddata wcs object")
self.wcs = ndd.wcs
self.coordsys = common.get_coord_system_name(self.header)
self.logger.debug("Coordinate system is: %s" % (self.coordsys))
except Exception as e:
self.logger.error("Error making WCS object: %s" % (str(e)))
self.wcs = None
def load_nddata(self, ndd):
try:
# reconstruct a pyfits header, because otherwise we take an
# incredible performance hit in astropy.wcs
self.logger.debug("Reconstructing astropy.io.fits header")
self.header = pyfits.Header(ndd.meta)
if ndd.wcs is None:
self.logger.debug("Trying to make astropy FITS WCS object")
self.wcs = pywcs.WCS(self.header, relax=True)
self.logger.debug("made astropy wcs object")
else:
self.logger.debug("reused nddata wcs object")
self.wcs = ndd.wcs
self.coordsys = common.get_coord_system_name(self.header)
self.logger.debug("Coordinate system is: %s" % (self.coordsys))
except Exception as e:
self.logger.error("Error making WCS object: %s" % (str(e)))
self.wcs = None
def load_header(self, header, fobj=None):
self.header = {}
self.header.update(header.items())
self.fix_bad_headers()
source = []
for key, value in header.items():
source.append("%-8.8s= %-70.70s" % (key, repr(value)))
# following https://gist.github.com/dsberry/4171277 to get a
# usable WCS in Ast
try:
self.logger.debug("Trying to make starlink wcs object")
# read in the header and create the default WCS transform
# adapter = Atl.PyFITSAdapter(hdu)
# fitschan = Ast.FitsChan(adapter)
fitschan = Ast.FitsChan(source)
self.wcs = fitschan.read()
# self.wcs is a FrameSet, with a Mapping
# self.wcs.Report = True
self.coordsys = common.get_coord_system_name(self.header)
self.logger.debug("Coordinate system is: %s" % (self.coordsys))
except Exception as e:
self.logger.error("Error making WCS object: %s" % (str(e)))
self.wcs = None
try:
# define a transform from this destination frame to icrs/j2000
refframe = self.wcs.getframe(2)
toframe = Ast.SkyFrame("System=ICRS, Equinox=J2000")
self.icrs_trans = refframe.convert(toframe)
except Exception as e:
self.logger.error("Error making ICRS transform: %s" % (str(e)))
