Coverage for python/astro_metadata_translator/translators/helpers.py : 18%

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# This file is part of astro_metadata_translator. # # Developed for the LSST Data Management System. # This product includes software developed by the LSST Project # (http://www.lsst.org). # See the COPYRIGHT file at the top-level directory of this distribution # for details of code ownership. # # This program is free software: you can redistribute it and/or modify # it under the terms of the GNU General Public License as published by # the Free Software Foundation, either version 3 of the License, or # (at your option) any later version. # # This program is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # GNU General Public License for more details. # # You should have received a copy of the GNU General Public License # along with this program. If not, see <http://www.gnu.org/licenses/>.
can use.
They are written as free functions. Some of them are written as if they are methods of `MetadataTranslator`, allowing them to be attached to translator classes that need them. These methods have full access to the translator methods.
Other functions are pure helpers that can be imported and used to help translation classes without using `MetadataTranslator` properties.
"""
"is_non_science", "tracking_from_degree_headers", "altitude_from_zenith_distance")
"""Calculate the observatory location via the telescope name.
Returns ------- loc : `astropy.coordinates.EarthLocation` Location of the observatory. """ return EarthLocation.of_site(self.to_telescope())
"""Raise an exception if this is a science observation.
Raises ------ KeyError Is a science observation. """ if self.to_observation_type() == "science": raise KeyError("Header represents science observation and can not default") return
"""Convert zenith distance to altitude
Parameters ---------- zd : `astropy.units.Quantity` Zenith distance as an angle.
Returns ------- alt : `astropy.units.Quantity` Altitude. """ return 90.*u.deg - zd
"""Calculate the tracking coordinates from lists of headers.
Parameters ---------- radecsys : `list` or `tuple` Header keywords to try corresponding to the tracking system. If none match ICRS will be assumed. pairs : `tuple` of `tuple` of pairs of `str` Pairs of keywords containing the RA/Dec in units of ``unit``. unit : `astropy.unit.BaseUnit` or `tuple` Unit definition suitable for the `~astropy.coordinate.SkyCoord` constructor.
Returns ------- radec = `astropy.coordinates.SkyCoord` The RA/Dec coordinates. None if this is a moving target or a non-science observation without any RA/Dec definition.
Raises ------ KeyError No RA/Dec keywords were found and this observation is a science observation. """ used = [] for k in radecsys: if k in self._header: frame = self._header[k].strip().lower() used.append(k) if frame == "gappt": self._used_these_cards(*used) # Moving target return None break else: frame = "icrs" for ra_key, dec_key in radecpairs: if ra_key in self._header and dec_key in self._header: radec = SkyCoord(self._header[ra_key], self._header[dec_key], frame=frame, unit=unit, obstime=self.to_datetime_begin(), location=self.to_location()) self._used_these_cards(ra_key, dec_key, *used) return radec if self.to_observation_type() == "science": raise KeyError("Unable to determine tracking RA/Dec of science observation") return None |