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# This file is currently part of obs_lsst but is written to allow it 

# to be migrated to the astro_metadata_translator package at a later date. 

# 

# This product includes software developed by the LSST Project 

# (http://www.lsst.org). 

# See the LICENSE file in this directory for details of code ownership. 

# 

# Use of this source code is governed by a 3-clause BSD-style 

# license that can be found in the LICENSE file. 

 

"""Metadata translation code for ImSim headers""" 

 

__all__ = ("ImsimTranslator", ) 

 

import logging 

import astropy.units as u 

 

from astro_metadata_translator import cache_translation 

from astro_metadata_translator.translators.helpers import tracking_from_degree_headers 

 

from .lsstsim import LsstSimTranslator 

 

log = logging.getLogger(__name__) 

 

 

class ImsimTranslator(LsstSimTranslator): 

"""Metadata translation class for ImSim headers""" 

 

name = "ImSim" 

"""Name of this translation class""" 

 

_const_map = { 

"instrument": "ImSim", 

"boresight_rotation_coord": "sky", 

"object": "UNKNOWN", 

"pressure": None, 

"temperature": None, 

"relative_humidity": 40.0, 

} 

 

_trivial_map = { 

"detector_group": "RAFTNAME", 

"detector_name": "SENSNAME", 

"observation_id": "OBSID", 

"science_program": "RUNNUM", 

"exposure_id": "OBSID", 

"visit_id": "OBSID", 

"physical_filter": "FILTER", 

"dark_time": ("DARKTIME", dict(unit=u.s)), 

"exposure_time": ("EXPTIME", dict(unit=u.s)), 

"detector_serial": "LSST_NUM", 

"boresight_rotation_angle": ("ROTANGLE", dict(unit=u.deg)), 

} 

 

cameraPolicyFile = "policy/imsim.yaml" 

 

@classmethod 

def can_translate(cls, header, filename=None): 

"""Indicate whether this translation class can translate the 

supplied header. 

 

There is no ``INSTRUME`` header in ImSim data. Instead we use 

the ``TESTTYPE`` header. 

 

Parameters 

---------- 

header : `dict`-like 

Header to convert to standardized form. 

filename : `str`, optional 

Name of file being translated. 

 

Returns 

------- 

can : `bool` 

`True` if the header is recognized by this class. `False` 

otherwise. 

""" 

return cls.can_translate_with_options(header, {"TESTTYPE": "IMSIM"}, 

filename=filename) 

 

@cache_translation 

def to_tracking_radec(self): 

# Docstring will be inherited. Property defined in properties.py 

radecsys = ("RADESYS",) 

radecpairs = (("RATEL", "DECTEL"),) 

return tracking_from_degree_headers(self, radecsys, radecpairs) 

 

@cache_translation 

def to_boresight_airmass(self): 

# Docstring will be inherited. Property defined in properties.py 

altaz = self.to_altaz_begin() 

if altaz is not None: 

return altaz.secz.to_value() 

return None