LsstAuxTelTranslator

class lsst.obs.lsst.LsstAuxTelTranslator(header, filename=None)

Bases: astro_metadata_translator.translator.StubTranslator

Metadata translator for LSST AuxTel data.

For lab measurements many values are masked out.

Attributes Summary

DETECTOR_GROUP_NAME	Fixed name of detector group.
DETECTOR_NAME	Fixed name of single sensor.
name	Name of this translation class
supported_instrument	Supports the LATISS instrument.
translators

Methods Summary

can_translate(header[, filename])	Indicate whether this translation class can translate the supplied header.
can_translate_with_options(header, options)	Helper method for can_translate allowing options.
cards_used()	Cards used during metadata extraction.
compute_detector_exposure_id(exposure_id, …)	Compute the detector exposure ID from detector number and exposure ID.
compute_exposure_id(dayobs, seqnum)	Helper method to calculate the AuxTel exposure_id.
determine_translator(header[, filename])	Determine a translation class by examining the header
quantity_from_card(keywords, unit[, …])	Calculate a Astropy Quantity from a header card and a unit.
to_altaz_begin()	Telescope boresight azimuth and elevation at start of observation.
to_boresight_airmass()	Airmass of the boresight of the telescope.
to_boresight_rotation_angle()	Angle of the instrument in boresight_rotation_coord frame.
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_datetime_begin()
to_datetime_end()
to_detector_exposure_id()
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).
to_detector_num()	Unique (for instrument) integer identifier for the sensor.
to_detector_serial()	Serial number/string associated with this detector.
to_exposure_id()	Generate a unique exposure ID number
to_exposure_time()	Duration of the exposure with shutter open (seconds).
to_instrument()	The instrument used to observe the exposure.
to_location()
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()	Determine the observation type.
to_physical_filter()
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_telescope()	Full name of the telescope.
to_temperature()	Temperature outside the dome.
to_tracking_radec()	Requested RA/Dec to track.
to_visit_id()	Generate a unique exposure ID number
validate_value(value, default[, minimum, …])	Validate the supplied value, returning a new value if out of range

Attributes Documentation

DETECTOR_GROUP_NAME = 'RXX'

Fixed name of detector group.

DETECTOR_NAME = 'S00'

Fixed name of single sensor.

name = 'LSSTAuxTel'

Name of this translation class

supported_instrument = 'LATISS'

Supports the LATISS instrument.

translators = {'DECam': <class 'astro_metadata_translator.translators.decam.DecamTranslator'>, 'HSC': <class 'astro_metadata_translator.translators.hsc.HscTranslator'>, 'ImSim': <class 'lsst.obs.lsst.translators.imsim.ImsimTranslator'>, 'LSST-TS8': <class 'lsst.obs.lsst.translators.ts8.LsstTS8Translator'>, 'LSST-UCDCam': <class 'lsst.obs.lsst.translators.lsst_ucdcam.LsstUCDCamTranslator'>, 'LSSTAuxTel': <class 'lsst.obs.lsst.translators.auxTel.LsstAuxTelTranslator'>, 'MegaPrime': <class 'astro_metadata_translator.translators.megaprime.MegaPrimeTranslator'>, 'PhoSim': <class 'lsst.obs.lsst.translators.phosim.PhosimTranslator'>, 'SuprimeCam': <class 'astro_metadata_translator.translators.suprimecam.SuprimeCamTranslator'>}

Methods Documentation

classmethod can_translate(header, filename=None)

Indicate whether this translation class can translate the supplied 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.

classmethod can_translate_with_options(header, options, filename=None)

Helper method for can_translate allowing options.

Parameters:

header : dict-like

Header to convert to standardized form.

options : dict

Headers to try to determine whether this header can be translated by this class. If a card is found it will be compared with the expected value and will return that comparison. Each card will be tried in turn until one is found.

filename : str, optional

Name of file being translated.

Returns:

can : bool

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

Notes

Intended to be used from within can_translate implementations for specific translators. Is not intended to be called directly from determine_translator.

cards_used()

Cards used during metadata extraction.

Returns:

used : frozenset of str

Cards used when extracting metadata.

static compute_detector_exposure_id(exposure_id, detector_num)

Compute the detector exposure ID from detector number and exposure ID.

This is a helper method to allow code working outside the translator infrastructure to use the same algorithm.

Parameters:

exposure_id : int

Unique exposure ID.

detector_num : int

Detector number.

Returns:

detector_exposure_id : int

The calculated ID.

static compute_exposure_id(dayobs, seqnum)

Helper method to calculate the AuxTel exposure_id.

Parameters:

dayobs : str

Day of observation in either YYYYMMDD or YYYY-MM-DD format.

seqnum : int or str

Sequence number.

Returns:

exposure_id : int

Exposure ID in form YYYYMMDDnnnnn form.

classmethod determine_translator(header, filename=None)

Determine a translation class by examining the header

Parameters:

header : dict-like

Representation of a header.

filename : str, optional

Name of file being translated.

Returns:

translator : MetadataTranslator

Translation class that knows how to extract metadata from the supplied header.

Raises:

ValueError

None of the registered translation classes understood the supplied header.

quantity_from_card(keywords, unit, default=None, minimum=None, maximum=None, checker=None)

Calculate a Astropy Quantity from a header card and a unit.

Parameters:

keywords : str or list of str

Keyword to use from header. If a list each keyword will be tried in turn until one matches.

unit : astropy.units.UnitBase

Unit of the item in the header.

default : float, optional

Default value to use if the header value is invalid. Assumed to be in the same units as the value expected in the header. If None, no default value is used.

minimum : float, optional

Minimum possible valid value, optional. If the calculated value is below this value, the default value will be used.

maximum : float, optional

Maximum possible valid value, optional. If the calculated value is above this value, the default value will be used.

checker : function, optional

Callback function to be used by the translator method in case the keyword is not present. Function will be executed as if it is a method of the translator class. Running without raising an exception will allow the default to be used. Should usually raise KeyError.

Returns:

q : astropy.units.Quantity

Quantity representing the header value.

Raises:

KeyError

The supplied header key is not present.

to_altaz_begin()

Telescope boresight azimuth and elevation at start of observation.

Returns:

translation : astropy.coordinates.AltAz

Translated property.

to_boresight_airmass()

Airmass of the boresight of the telescope.

Returns:

translation : float

Translated value derived from the header.

to_boresight_rotation_angle()

Angle of the instrument in boresight_rotation_coord frame.

Returns:

translation : astropy.coordinates.Angle

Translated value derived from the header.

to_boresight_rotation_coord()

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

Returns:

translation : str

Translated property.

to_dark_time()

Duration of the exposure with shutter closed (seconds).

Returns:

translation : astropy.units.Quantity

Translated value derived from the header.

to_datetime_begin()

to_datetime_end()

to_detector_exposure_id()

to_detector_group()

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

Returns:

translation : str

Translated property.

to_detector_name()

Name of the detector within the instrument (might not be unique).

Returns:

translation : str

Translated property.

to_detector_num()

Unique (for instrument) integer identifier for the sensor.

Returns:

translation : int

Translated property.

to_detector_serial()

Serial number/string associated with this detector.

Returns:

translation : str

Translated value derived from the header.

to_exposure_id()

Generate a unique exposure ID number

This is a combination of DAYOBS and SEQNUM.

Returns:

exposure_id : int

Unique exposure number.

to_exposure_time()

Duration of the exposure with shutter open (seconds).

Returns:

translation : astropy.units.Quantity

Translated value derived from the header.

to_instrument()

The instrument used to observe the exposure.

Returns:

translation : str

Translated property.

to_location()

to_object()

Object of interest or field name.

Returns:

translation : str

Translated value derived from the header.

to_observation_id()

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

Returns:

translation : str

Translated value derived from the header.

to_observation_type()

Determine the observation type.

In the absence of an IMGTYPE header, assumes lab data is always a dark if exposure time is non-zero, else bias.

Returns:

obstype : str

Observation type.

to_physical_filter()

to_pressure()

Atmospheric pressure outside the dome.

Returns:

translation : astropy.units.Quantity

Translated property.

to_relative_humidity()

Relative humidity outside the dome.

Returns:

translation : float

Translated property.

to_science_program()

Observing program (survey or proposal) identifier.

Returns:

translation : str

Translated property.

to_telescope()

Full name of the telescope.

Returns:

translation : str

Translated property.

to_temperature()

Temperature outside the dome.

Returns:

translation : astropy.units.Quantity

Translated property.

to_tracking_radec()

Requested RA/Dec to track.

Returns:

translation : astropy.coordinates.SkyCoord

Translated property.

to_visit_id()

Generate a unique exposure ID number

This is a combination of DAYOBS and SEQNUM.

Returns:

exposure_id : int

Unique exposure number.

static validate_value(value, default, minimum=None, maximum=None)

Validate the supplied value, returning a new value if out of range

Parameters:

value : float

Value to be validated.

default : float

Default value to use if supplied value is invalid or out of range. Assumed to be in the same units as the value expected in the header.

minimum : float

Minimum possible valid value, optional. If the calculated value is below this value, the default value will be used.

maximum : float

Maximum possible valid value, optional. If the calculated value is above this value, the default value will be used.

Returns:

value : float

Either the supplied value, or a default value.