Coverage for python/lsst/obs/lsst/translators/lsstsim.py : 36%

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1# This file is currently part of obs_lsst but is written to allow it
2# to be migrated to the astro_metadata_translator package at a later date.
3#
4# This product includes software developed by the LSST Project
5# (http://www.lsst.org).
6# See the LICENSE file in this directory for details of code ownership.
7#
8# Use of this source code is governed by a 3-clause BSD-style
9# license that can be found in the LICENSE file.
11"""Metadata translation code for LSST simulations"""
13__all__ = ("LsstSimTranslator", )
15import warnings
16import logging
18import astropy.utils.exceptions
19from astropy.coordinates import AltAz
20from astro_metadata_translator import cache_translation
22from .lsst import LsstBaseTranslator, SIMONYI_LOCATION, SIMONYI_TELESCOPE
24log = logging.getLogger(__name__)
27class LsstSimTranslator(LsstBaseTranslator):
28 """Shared routines for LSST Simulated Data.
29 """
31 # Reset mappings
32 _const_map = {
33 # neither phosim nor imsim report a counter
34 "observation_counter": 0,
35 }
36 _trivial_map = {}
38 @classmethod
39 def max_exposure_id(cls):
40 """The maximum exposure ID expected from this instrument.
42 Returns
43 -------
44 max_exposure_id : `int`
45 The maximum value.
46 """
47 return 9_999_999
49 @cache_translation
50 def to_telescope(self):
51 # Docstring will be inherited. Property defined in properties.py
52 telescope = None
53 if self.is_key_ok("OUTFILE") and self._header["OUTFILE"].startswith("lsst"):
54 telescope = SIMONYI_TELESCOPE
55 self._used_these_cards("OUTFILE")
56 elif "LSST_NUM" in self._header:
57 telescope = SIMONYI_TELESCOPE
58 self._used_these_cards("LSST_NUM")
59 return telescope
61 @cache_translation
62 def to_location(self):
63 # Docstring will be inherited. Property defined in properties.py
64 location = None
65 # In theory simulated files might not be for LSST
66 tel = self.to_telescope()
67 if tel == SIMONYI_TELESCOPE:
68 location = SIMONYI_LOCATION
69 else:
70 # Try standard FITS headers
71 try:
72 location = super().to_location()
73 except Exception:
74 pass
75 return location
77 @cache_translation
78 def to_altaz_begin(self):
79 # Docstring will be inherited. Property defined in properties.py
80 if self.to_observation_type() == "science":
81 # Derive from RADec in absence of any other information
82 radec = self.to_tracking_radec()
83 if radec is not None:
84 # This can trigger warnings because of the future dates
85 with warnings.catch_warnings():
86 warnings.simplefilter("ignore", category=astropy.utils.exceptions.AstropyWarning)
87 altaz = radec.transform_to(AltAz())
88 return altaz
89 return None