LsstCamPhoSimTranslator

class lsst.obs.lsst.translators.LsstCamPhoSimTranslator(header: Mapping[str, Any], filename: str | None = None)

Bases: LsstSimTranslator

Metadata translator for LSSTCam PhoSim data.

Attributes Summary

all_properties	All the valid properties for this translator including extensions.
cameraPolicyFile	Path to policy file relative to obs_lsst root.
detectorMapping	Mapping of detector name to detector number and serial.
detectorSerials	Mapping of detector serial number to raft, number, and name.
name	Name of this translation class

Methods Summary

can_translate(header[, filename])	Indicate whether this translation class can translate the supplied header.
determine_translatable_headers(filename[, ...])	Given a file return all the headers usable for metadata translation.
to_altaz_begin()	Return value of altaz_begin from headers.
to_boresight_airmass()	Airmass of the boresight of the telescope.
to_boresight_rotation_angle()	Return value of boresight_rotation_angle from headers.
to_boresight_rotation_coord()	Coordinate frame of the instrument rotation angle (options: sky, unknown).
to_dark_time()	Duration of the exposure with shutter closed (seconds).
to_detector_group()	Collection name of which this detector is a part.
to_detector_name()	Name of the detector within the instrument (might not be unique if there are detector groups).
to_detector_serial()	Serial number/string associated with this detector.
to_exposure_id()	Unique (with instrument) integer identifier for this observation.
to_exposure_time()	Actual duration of the exposure (seconds).
to_instrument()	The instrument used to observe the exposure.
to_object()	Object of interest or field name.
to_observation_id()	Label uniquely identifying this observation (can be related to 'exposure_id').
to_observation_type()	Type of observation (currently: science, dark, flat, bias, focus).
to_physical_filter()	The bandpass filter used for this observation.
to_pressure()	Atmospheric pressure outside the dome.
to_relative_humidity()	Relative humidity outside the dome.
to_science_program()	Observing program (survey or proposal) identifier.
to_temperature()	Temperature outside the dome.
to_tracking_radec()	Return value of tracking_radec from headers.
to_visit_id()	ID of the Visit this Exposure is associated with.

Attributes Documentation

all_properties: dict[str, PropertyDefinition] = {'altaz_begin': PropertyDefinition(doc='Telescope boresight azimuth and elevation at start of observation.', str_type='astropy.coordinates.AltAz', py_type=<class 'astropy.coordinates.builtin_frames.altaz.AltAz'>, to_simple=<function altaz_to_simple>, from_simple=<function simple_to_altaz>), 'altaz_end': PropertyDefinition(doc='Telescope boresight azimuth and elevation at end of observation.', str_type='astropy.coordinates.AltAz', py_type=<class 'astropy.coordinates.builtin_frames.altaz.AltAz'>, to_simple=<function altaz_to_simple>, from_simple=<function simple_to_altaz>), 'boresight_airmass': PropertyDefinition(doc='Airmass of the boresight of the telescope.', str_type='float', py_type=<class 'float'>, to_simple=None, from_simple=None), 'boresight_rotation_angle': PropertyDefinition(doc='Angle of the instrument in boresight_rotation_coord frame.', str_type='astropy.coordinates.Angle', py_type=<class 'astropy.coordinates.angles.core.Angle'>, to_simple=<function angle_to_simple>, from_simple=<function simple_to_angle>), 'boresight_rotation_coord': PropertyDefinition(doc='Coordinate frame of the instrument rotation angle (options: sky, unknown).', str_type='str', py_type=<class 'str'>, to_simple=None, from_simple=None), 'can_see_sky': PropertyDefinition(doc='True if the observation is looking at sky, False if it is definitely not looking at the sky. None indicates that it is not known whether sky could be seen.', str_type='bool', py_type=<class 'bool'>, to_simple=None, from_simple=None), 'dark_time': PropertyDefinition(doc='Duration of the exposure with shutter closed (seconds).', str_type='astropy.units.Quantity', py_type=<class 'astropy.units.quantity.Quantity'>, to_simple=<function exptime_to_simple>, from_simple=<function simple_to_exptime>), 'datetime_begin': PropertyDefinition(doc='Time of the start of the observation.', str_type='astropy.time.Time', py_type=<class 'astropy.time.core.Time'>, to_simple=<function datetime_to_simple>, from_simple=<function simple_to_datetime>), 'datetime_end': PropertyDefinition(doc='Time of the end of the observation.', str_type='astropy.time.Time', py_type=<class 'astropy.time.core.Time'>, to_simple=<function datetime_to_simple>, from_simple=<function simple_to_datetime>), 'detector_exposure_id': PropertyDefinition(doc='Unique integer identifier for this detector in this exposure.', str_type='int', py_type=<class 'int'>, to_simple=None, from_simple=None), 'detector_group': PropertyDefinition(doc='Collection name of which this detector is a part. Can be None if there are no detector groupings.', str_type='str', py_type=<class 'str'>, to_simple=None, from_simple=None), 'detector_name': PropertyDefinition(doc='Name of the detector within the instrument (might not be unique if there are detector groups).', str_type='str', py_type=<class 'str'>, to_simple=None, from_simple=None), 'detector_num': PropertyDefinition(doc='Unique (for instrument) integer identifier for the sensor.', str_type='int', py_type=<class 'int'>, to_simple=None, from_simple=None), 'detector_serial': PropertyDefinition(doc='Serial number/string associated with this detector.', str_type='str', py_type=<class 'str'>, to_simple=None, from_simple=None), 'detector_unique_name': PropertyDefinition(doc='Unique name of the detector within the focal plane, generally combining detector_group with detector_name.', str_type='str', py_type=<class 'str'>, to_simple=None, from_simple=None), 'exposure_group': PropertyDefinition(doc="Label to use to associate this exposure with others (can be related to 'exposure_id').", str_type='str', py_type=<class 'str'>, to_simple=None, from_simple=None), 'exposure_id': PropertyDefinition(doc='Unique (with instrument) integer identifier for this observation.', str_type='int', py_type=<class 'int'>, to_simple=None, from_simple=None), 'exposure_time': PropertyDefinition(doc='Actual duration of the exposure (seconds).', str_type='astropy.units.Quantity', py_type=<class 'astropy.units.quantity.Quantity'>, to_simple=<function exptime_to_simple>, from_simple=<function simple_to_exptime>), 'exposure_time_requested': PropertyDefinition(doc='Requested duration of the exposure (seconds).', str_type='astropy.units.Quantity', py_type=<class 'astropy.units.quantity.Quantity'>, to_simple=<function exptime_to_simple>, from_simple=<function simple_to_exptime>), 'focus_z': PropertyDefinition(doc='Defocal distance.', str_type='astropy.units.Quantity', py_type=<class 'astropy.units.quantity.Quantity'>, to_simple=<function focusz_to_simple>, from_simple=<function simple_to_focusz>), 'group_counter_end': PropertyDefinition(doc='Observation counter for the end of the exposure group. Depending on the instrument the relevant group may be visit_id or exposure_group.', str_type='int', py_type=<class 'int'>, to_simple=None, from_simple=None), 'group_counter_start': PropertyDefinition(doc='Observation counter for the start of the exposure group.Depending on the instrument the relevant group may be visit_id or exposure_group.', str_type='int', py_type=<class 'int'>, to_simple=None, from_simple=None), 'has_simulated_content': PropertyDefinition(doc='Boolean indicating whether any part of this observation was simulated.', str_type='bool', py_type=<class 'bool'>, to_simple=None, from_simple=None), 'instrument': PropertyDefinition(doc='The instrument used to observe the exposure.', str_type='str', py_type=<class 'str'>, to_simple=None, from_simple=None), 'location': PropertyDefinition(doc='Location of the observatory.', str_type='astropy.coordinates.EarthLocation', py_type=<class 'astropy.coordinates.earth.EarthLocation'>, to_simple=<function earthlocation_to_simple>, from_simple=<function simple_to_earthlocation>), 'object': PropertyDefinition(doc='Object of interest or field name.', str_type='str', py_type=<class 'str'>, to_simple=None, from_simple=None), 'observation_counter': PropertyDefinition(doc='Counter of this observation. Can be counter within observing_day or a global counter. Likely to be observatory specific.', str_type='int', py_type=<class 'int'>, to_simple=None, from_simple=None), 'observation_id': PropertyDefinition(doc="Label uniquely identifying this observation (can be related to 'exposure_id').", str_type='str', py_type=<class 'str'>, to_simple=None, from_simple=None), 'observation_reason': PropertyDefinition(doc="Reason this observation was taken, or its purpose ('science' and 'calibration' are common values)", str_type='str', py_type=<class 'str'>, to_simple=None, from_simple=None), 'observation_type': PropertyDefinition(doc='Type of observation (currently: science, dark, flat, bias, focus).', str_type='str', py_type=<class 'str'>, to_simple=None, from_simple=None), 'observing_day': PropertyDefinition(doc='Integer in YYYYMMDD format corresponding to the day of observation.', str_type='int', py_type=<class 'int'>, to_simple=None, from_simple=None), 'observing_day_offset': PropertyDefinition(doc='Offset to subtract from an observation date when calculating the observing day. Conversely, the offset to add to an observing day when calculating the time span of a day.', str_type='astropy.time.TimeDelta', py_type=<class 'astropy.time.core.TimeDelta'>, to_simple=<function timedelta_to_simple>, from_simple=<function simple_to_timedelta>), 'physical_filter': PropertyDefinition(doc='The bandpass filter used for this observation.', str_type='str', py_type=<class 'str'>, to_simple=None, from_simple=None), 'pressure': PropertyDefinition(doc='Atmospheric pressure outside the dome.', str_type='astropy.units.Quantity', py_type=<class 'astropy.units.quantity.Quantity'>, to_simple=<function pressure_to_simple>, from_simple=<function simple_to_pressure>), 'relative_humidity': PropertyDefinition(doc='Relative humidity outside the dome.', str_type='float', py_type=<class 'float'>, to_simple=None, from_simple=None), 'science_program': PropertyDefinition(doc='Observing program (survey or proposal) identifier.', str_type='str', py_type=<class 'str'>, to_simple=None, from_simple=None), 'telescope': PropertyDefinition(doc='Full name of the telescope.', str_type='str', py_type=<class 'str'>, to_simple=None, from_simple=None), 'temperature': PropertyDefinition(doc='Temperature outside the dome.', str_type='astropy.units.Quantity', py_type=<class 'astropy.units.quantity.Quantity'>, to_simple=<function temperature_to_simple>, from_simple=<function simple_to_temperature>), 'tracking_radec': PropertyDefinition(doc='Requested RA/Dec to track.', str_type='astropy.coordinates.SkyCoord', py_type=<class 'astropy.coordinates.sky_coordinate.SkyCoord'>, to_simple=<function skycoord_to_simple>, from_simple=<function simple_to_skycoord>), 'visit_id': PropertyDefinition(doc='ID of the Visit this Exposure is associated with.\n\nScience observations should essentially always be\nassociated with a visit, but calibration observations\nmay not be.', str_type='int', py_type=<class 'int'>, to_simple=None, from_simple=None)}

All the valid properties for this translator including extensions.

cameraPolicyFile = 'policy/phosim.yaml'

Path to policy file relative to obs_lsst root.

detectorMapping = None

Mapping of detector name to detector number and serial.

detectorSerials = None

Mapping of detector serial number to raft, number, and name.

name: str | None = 'LSSTCam-PhoSim'

Name of this translation class

Methods Documentation

classmethod can_translate(header, filename=None)

Indicate whether this translation class can translate the supplied header.

There is no INSTRUME header in PhoSim data. Instead we use the CREATOR header.

Parameters

headerdict-like

Header to convert to standardized form.

filenamestr, optional

Name of file being translated.

Returns

canbool

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

classmethod determine_translatable_headers(filename, primary=None)

Given a file return all the headers usable for metadata translation.

Phosim splits useful metadata between the primary header and the amplifier headers. A single header is returned as a merge of the first two.

Parameters

filenamestr or lsst.resources.ResourcePathExpression

Path to a file in a format understood by this translator.

primarydict-like, optional

The primary header obtained by the caller. This is sometimes already known, for example if a system is trying to bootstrap without already knowing what data is in the file. Will be ignored.

Yields

headersiterator of dict-like

The primary header merged with the secondary header.

Notes

This translator class is specifically tailored to raw PhoSim data and is not designed to work with general FITS files. The normal paradigm is for the caller to have read the first header and then called determine_translator() on the result to work out which translator class to then call to obtain the real headers to be used for translation.

to_altaz_begin() → Any

Return value of altaz_begin from headers.

Telescope boresight azimuth and elevation at start of observation.

Returns

altaz_beginastropy.coordinates.AltAz

The translated property.

to_boresight_airmass() → Any

Airmass of the boresight of the telescope.

Returns

translationfloat

Translated value derived from the header.

to_boresight_rotation_angle() → Any

Return value of boresight_rotation_angle from headers.

Angle of the instrument in boresight_rotation_coord frame.

Returns

boresight_rotation_angleastropy.coordinates.Angle

The translated property.

to_boresight_rotation_coord() → Any

Coordinate frame of the instrument rotation angle (options: sky, unknown).

Returns

translationstr

Translated property.

to_dark_time() → Any

Duration of the exposure with shutter closed (seconds).

Returns

translationastropy.units.Quantity

Translated value derived from the header.

to_detector_group() → Any

Collection name of which this detector is a part. Can be None if there are no detector groupings.

Returns

translationstr

Translated value derived from the header.

to_detector_name() → Any

Name of the detector within the instrument (might not be unique if there are detector groups).

Returns

translationstr

Translated value derived from the header.

to_detector_serial() → Any

Serial number/string associated with this detector.

Returns

translationstr

Translated value derived from the header.

to_exposure_id() → Any

Unique (with instrument) integer identifier for this observation.

Returns

translationint

Translated value derived from the header.

to_exposure_time() → Any

Actual duration of the exposure (seconds).

Returns

translationastropy.units.Quantity

Translated value derived from the header.

to_instrument() → Any

The instrument used to observe the exposure.

Returns

translationstr

Translated property.

to_object() → Any

Object of interest or field name.

Returns

translationstr

Translated property.

to_observation_id() → Any

Label uniquely identifying this observation (can be related to ‘exposure_id’).

Returns

translationstr

Translated value derived from the header.

to_observation_type() → Any

Type of observation (currently: science, dark, flat, bias, focus).

Returns

translationstr

Translated property.

to_physical_filter() → Any

The bandpass filter used for this observation.

Returns

translationstr

Translated value derived from the header.

to_pressure() → Any

Atmospheric pressure outside the dome.

Returns

translationastropy.units.Quantity

Translated value derived from the header.

to_relative_humidity() → Any

Relative humidity outside the dome.

Returns

translationfloat

Translated property.

to_science_program() → Any

Observing program (survey or proposal) identifier.

Returns

translationstr

Translated value derived from the header.

to_temperature() → Any

Temperature outside the dome.

Returns

translationastropy.units.Quantity

Translated value derived from the header.

to_tracking_radec() → Any

Return value of tracking_radec from headers.

Requested RA/Dec to track.

Returns

tracking_radecastropy.coordinates.SkyCoord

The translated property.

to_visit_id() → Any

ID of the Visit this Exposure is associated with.

Science observations should essentially always be associated with a visit, but calibration observations may not be.

translationint

Translated value derived from the header.