Coverage for python/lsst/obs/base/makeRawVisitInfoViaObsInfo.py: 15%
102 statements
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1# This file is part of obs_base.
2#
3# Developed for the LSST Data Management System.
4# This product includes software developed by the LSST Project
5# (https://www.lsst.org).
6# See the COPYRIGHT file at the top-level directory of this distribution
7# for details of code ownership.
8#
9# This program is free software: you can redistribute it and/or modify
10# it under the terms of the GNU General Public License as published by
11# the Free Software Foundation, either version 3 of the License, or
12# (at your option) any later version.
13#
14# This program is distributed in the hope that it will be useful,
15# but WITHOUT ANY WARRANTY; without even the implied warranty of
16# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17# GNU General Public License for more details.
18#
19# You should have received a copy of the GNU General Public License
20# along with this program. If not, see <http://www.gnu.org/licenses/>.
22__all__ = ["MakeRawVisitInfoViaObsInfo"]
24import logging
25import warnings
26from typing import ClassVar
28import astropy.units
29import astropy.utils.exceptions
30from astropy.utils import iers
32# Prefer the standard pyerfa over the Astropy version
33try:
34 import erfa
36 ErfaWarning = erfa.ErfaWarning
37except ImportError:
38 import astropy._erfa as erfa
40 ErfaWarning = None
42from astro_metadata_translator import MetadataTranslator, ObservationInfo
43from lsst.afw.coord import Observatory, Weather
44from lsst.afw.image import RotType, VisitInfo
45from lsst.daf.base import DateTime
46from lsst.geom import SpherePoint, degrees, radians
49class MakeRawVisitInfoViaObsInfo:
50 """Base class functor to make a VisitInfo from the FITS header of a
51 raw image using `~astro_metadata_translator.ObservationInfo` translators.
53 Subclasses can be used if a specific
54 `~astro_metadata_translator.MetadataTranslator` translator should be used.
56 The design philosophy is to make a best effort and log warnings of
57 problems, rather than raising exceptions, in order to extract as much
58 VisitInfo information as possible from a messy FITS header without the
59 user needing to add a lot of error handling.
61 Parameters
62 ----------
63 log : `logging.Logger` or None
64 Logger to use for messages.
65 (None to use
66 ``Log.getLogger("lsst.obs.base.makeRawVisitInfoViaObsInfo")``).
67 doStripHeader : `bool`, optional
68 Strip header keywords from the metadata as they are used?
69 """
71 metadataTranslator: ClassVar[MetadataTranslator | None] = None
72 """Header translator to use to construct VisitInfo, defaulting to
73 automatic determination."""
75 def __init__(self, log=None, doStripHeader=False):
76 if log is None:
77 log = logging.getLogger(__name__)
78 self.log = log
79 self.doStripHeader = doStripHeader
81 def __call__(self, md):
82 """Construct a VisitInfo and strip associated data from the metadata.
84 Parameters
85 ----------
86 md : `lsst.daf.base.PropertyList` or `lsst.daf.base.PropertySet`
87 Metadata to pull from.
88 May be modified if ``stripHeader`` is ``True``.
90 Returns
91 -------
92 visitInfo : `lsst.afw.image.VisitInfo`
93 `~lsst.afw.image.VisitInfo` derived from the header using
94 a `~astro_metadata_translator.MetadataTranslator`.
95 """
96 obsInfo = ObservationInfo(md, translator_class=self.metadataTranslator)
98 if self.doStripHeader:
99 # Strip all the cards out that were used
100 for c in obsInfo.cards_used:
101 del md[c]
103 return self.observationInfo2visitInfo(obsInfo, log=self.log)
105 @staticmethod
106 def observationInfo2visitInfo(obsInfo, log=None):
107 """Construct a `~lsst.afw.image.VisitInfo` from an
108 `~astro_metadata_translator.ObservationInfo`.
110 Parameters
111 ----------
112 obsInfo : `astro_metadata_translator.ObservationInfo`
113 Information gathered from the observation metadata.
114 log : `logging.Logger` or `lsst.log.Log`, optional
115 Logger to use for logging informational messages.
116 If `None` logging will be disabled.
118 Returns
119 -------
120 visitInfo : `lsst.afw.image.VisitInfo`
121 `~lsst.afw.image.VisitInfo` derived from the supplied
122 `~astro_metadata_translator.ObservationInfo`.
123 """
124 argDict = {}
126 # Map the translated information into a form suitable for VisitInfo
127 if obsInfo.exposure_time is not None:
128 argDict["exposureTime"] = obsInfo.exposure_time.to_value("s")
129 if obsInfo.dark_time is not None:
130 argDict["darkTime"] = obsInfo.dark_time.to_value("s")
131 argDict["id"] = obsInfo.exposure_id
132 argDict["instrumentLabel"] = obsInfo.instrument
133 if obsInfo.focus_z is not None:
134 argDict["focusZ"] = obsInfo.focus_z.to_value("mm")
135 if obsInfo.observation_type is not None:
136 argDict["observationType"] = obsInfo.observation_type
137 if obsInfo.science_program is not None:
138 argDict["scienceProgram"] = obsInfo.science_program
139 if obsInfo.observation_reason is not None:
140 argDict["observationReason"] = obsInfo.observation_reason
141 if obsInfo.object is not None:
142 argDict["object"] = obsInfo.object
143 if obsInfo.has_simulated_content is not None:
144 argDict["hasSimulatedContent"] = obsInfo.has_simulated_content
146 # VisitInfo uses the middle of the observation for the date
147 if obsInfo.datetime_begin is not None and obsInfo.datetime_end is not None:
148 tdelta = obsInfo.datetime_end - obsInfo.datetime_begin
149 middle = obsInfo.datetime_begin + 0.5 * tdelta
151 # DateTime uses nanosecond resolution, regardless of the resolution
152 # of the original date
153 middle.precision = 9
154 # isot is ISO8601 format with "T" separating date and time and no
155 # time zone
156 argDict["date"] = DateTime(middle.tai.isot, DateTime.TAI)
158 # Derive earth rotation angle from UT1 (being out by a second is
159 # not a big deal given the uncertainty over exactly what part of
160 # the observation we are needing it for).
161 # ERFA needs a UT1 time split into two floats
162 # We ignore any problems with DUT1 not being defined for now.
163 try:
164 # Catch any warnings about the time being in the future
165 # since there is nothing we can do about that for simulated
166 # data and it tells us nothing for data from the past.
167 with warnings.catch_warnings():
168 # If we are using the real erfa it is not an AstropyWarning
169 # During transition period filter both
170 warnings.simplefilter("ignore", category=astropy.utils.exceptions.AstropyWarning)
171 if ErfaWarning is not None:
172 warnings.simplefilter("ignore", category=ErfaWarning)
173 ut1time = middle.ut1
174 except iers.IERSRangeError:
175 ut1time = middle
177 era = erfa.era00(ut1time.jd1, ut1time.jd2)
178 argDict["era"] = era * radians
179 else:
180 argDict["date"] = DateTime()
182 # Coordinates
183 if obsInfo.tracking_radec is not None:
184 icrs = obsInfo.tracking_radec.transform_to("icrs")
185 argDict["boresightRaDec"] = SpherePoint(icrs.ra.degree, icrs.dec.degree, units=degrees)
187 altaz = obsInfo.altaz_begin
188 if altaz is not None:
189 argDict["boresightAzAlt"] = SpherePoint(altaz.az.degree, altaz.alt.degree, units=degrees)
191 argDict["boresightAirmass"] = obsInfo.boresight_airmass
193 if obsInfo.boresight_rotation_angle is not None:
194 argDict["boresightRotAngle"] = obsInfo.boresight_rotation_angle.degree * degrees
196 if obsInfo.boresight_rotation_coord is not None:
197 rotType = RotType.UNKNOWN
198 if obsInfo.boresight_rotation_coord == "sky":
199 rotType = RotType.SKY
200 argDict["rotType"] = rotType
202 # Weather and Observatory Location
203 temperature = float("nan")
204 if obsInfo.temperature is not None:
205 temperature = obsInfo.temperature.to_value("deg_C", astropy.units.temperature())
206 pressure = float("nan")
207 if obsInfo.pressure is not None:
208 pressure = obsInfo.pressure.to_value("Pa")
209 relative_humidity = float("nan")
210 if obsInfo.relative_humidity is not None:
211 relative_humidity = obsInfo.relative_humidity
212 argDict["weather"] = Weather(temperature, pressure, relative_humidity)
214 if obsInfo.location is not None:
215 geolocation = obsInfo.location.to_geodetic()
216 argDict["observatory"] = Observatory(
217 geolocation.lon.degree * degrees,
218 geolocation.lat.degree * degrees,
219 geolocation.height.to_value("m"),
220 )
222 for key in list(argDict.keys()): # use a copy because we may delete items
223 if argDict[key] is None:
224 if log is not None:
225 log.warning("argDict[%s] is None; stripping", key)
226 del argDict[key]
228 return VisitInfo(**argDict)