PhosimTranslator

class lsst.obs.lsst.translators.PhosimTranslator(header, filename=None)

Bases: lsst.obs.lsst.translators.lsstsim.LsstSimTranslator

Metadata translator for LSST PhoSim data.

Attributes Summary

DETECTOR_MAX
cameraPolicyFile
default_resource_package
default_resource_root
default_search_path
detectorMapping
detectorSerials
name	Name of this translation class
supported_instrument
translators

Methods Summary

are_keys_ok(keywords)	Are the supplied keys all present and defined?
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_detector_info_from_serial(…)	Helper method to return the detector information from the serial.
compute_detector_num_from_name(…)	Helper method to return the detector number from the name.
compute_exposure_id(dayobs, seqnum[, controller])	Helper method to calculate the exposure_id.
defined_in_this_class(name)	Report if the specified class attribute is defined specifically in this class.
detector_mapping()	Returns the mapping of full name to detector ID and serial.
detector_serials()	Obtain the mapping of detector serial to detector group, name, and number.
determine_translator(header[, filename])	Determine a translation class by examining the header
is_key_ok(keyword)	Return True if the value associated with the named keyword is present in this header and defined.
is_keyword_defined(header, keyword)	Return True if the value associated with the named keyword is present in the supplied header and defined.
max_detector_exposure_id()	The maximum detector exposure ID expected to be generated by this instrument.
max_exposure_id()	The maximum exposure ID expected from this instrument.
quantity_from_card(keywords, unit[, …])	Calculate a Astropy Quantity from a header card and a unit.
resource_root()	Package resource to use to locate correction resources within an installed package.
search_paths()	Search paths to use for LSST data when looking for header correction files.
to_altaz_begin()
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 if there are detector groups).
to_detector_num()
to_detector_serial()	Serial number/string associated with this detector.
to_detector_unique_name()	Return a unique name for the detector.
to_exposure_id()	Unique (with instrument) integer identifier for this observation.
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()	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_telescope()
to_temperature()	Temperature outside the dome.
to_tracking_radec()
to_visit_id()	ID of the Visit this Exposure is associated with.
validate_value(value, default[, minimum, …])	Validate the supplied value, returning a new value if out of range

Attributes Documentation

DETECTOR_MAX = 999

cameraPolicyFile = 'policy/phosim.yaml'

default_resource_package = 'astro_metadata_translator'

default_resource_root = None

default_search_path = None

detectorMapping = None

detectorSerials = None

name = 'PhoSim'

Name of this translation class

supported_instrument = None

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-ComCam': <class 'lsst.obs.lsst.translators.comCam.LsstComCamTranslator'>, 'LSST-TS3': <class 'lsst.obs.lsst.translators.ts3.LsstTS3Translator'>, 'LSST-TS8': <class 'lsst.obs.lsst.translators.ts8.LsstTS8Translator'>, 'LSST-UCDCam': <class 'lsst.obs.lsst.translators.lsst_ucdcam.LsstUCDCamTranslator'>, 'LSSTCam': <class 'lsst.obs.lsst.translators.lsstCam.LsstCamTranslator'>, 'LSST_LATISS': <class 'lsst.obs.lsst.translators.latiss.LsstLatissTranslator'>, 'MegaPrime': <class 'astro_metadata_translator.translators.megaprime.MegaPrimeTranslator'>, 'PhoSim': <class 'lsst.obs.lsst.translators.phosim.PhosimTranslator'>, 'SDSS': <class 'astro_metadata_translator.translators.sdss.SdssTranslator'>, 'SuprimeCam': <class 'astro_metadata_translator.translators.suprimecam.SuprimeCamTranslator'>}

Methods Documentation

are_keys_ok(keywords)

Are the supplied keys all present and defined?

Parameters

keywordsiterable of str

Keywords to test.

Returns

all_okbool

True if all supplied keys are present and defined.

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 can_translate_with_options(header, options, filename=None)

Helper method for can_translate allowing options.

Parameters

headerdict-like

Header to convert to standardized form.

optionsdict

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.

filenamestr, optional

Name of file being translated.

Returns

canbool

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

usedfrozenset of str

Cards used when extracting metadata.

classmethod 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_idint

Unique exposure ID.

detector_numint

Detector number.

Returns

detector_exposure_idint

The calculated ID.

classmethod compute_detector_info_from_serial(detector_serial)

Helper method to return the detector information from the serial.

Parameters

detector_serialstr

Detector serial ID.

Returns

infotuple of (str, str, int)

Detector group, name, and number.

classmethod compute_detector_num_from_name(detector_group, detector_name)

Helper method to return the detector number from the name.

Parameters

detector_groupstr

Name of the detector grouping. This is generally the raft name.

detector_namestr

Detector name.

Returns

numint

Detector number.

static compute_exposure_id(dayobs, seqnum, controller=None)

Helper method to calculate the exposure_id.

Parameters

dayobsstr

Day of observation in either YYYYMMDD or YYYY-MM-DD format. If the string looks like ISO format it will be truncated before the T before being handled.

seqnumint or str

Sequence number.

controllerstr, optional

Controller to use. If this is “O”, no change is made to the exposure ID. If it is “C” a 1000 is added to the year component of the exposure ID. None indicates that the controller is not relevant to the exposure ID calculation (generally this is the case for test stand data).

Returns

exposure_idint

Exposure ID in form YYYYMMDDnnnnn form.

classmethod defined_in_this_class(name)

Report if the specified class attribute is defined specifically in this class.

Parameters

namestr

Name of the attribute to test.

Returns

in_classbool

True if there is a attribute of that name defined in this specific subclass. False if the method is not defined in this specific subclass but is defined in a parent class. Returns None if the attribute is not defined anywhere in the class hierarchy (which can happen if translators have typos in their mapping tables).

Notes

Retrieves the attribute associated with the given name. Then looks in all the parent classes to determine whether that attribute comes from a parent class or from the current class. Attributes are compared using id().

classmethod detector_mapping()

Returns the mapping of full name to detector ID and serial.

Returns

mappingdict of str:tuple

Returns the mapping of full detector name (group+detector) to detector number and serial.

Raises

ValueError

Raised if no camera policy file has been registered with this translation class.

Notes

Will construct the mapping if none has previously been constructed.

classmethod detector_serials()

Obtain the mapping of detector serial to detector group, name, and number.

Returns

infodict of tuple of (str, str, int)

A dict with the serial numbers as keys and values of detector group, name, and number.

classmethod determine_translator(header, filename=None)

Determine a translation class by examining the header

Parameters

headerdict-like

Representation of a header.

filenamestr, optional

Name of file being translated.

Returns

translatorMetadataTranslator

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

Raises

ValueError

None of the registered translation classes understood the supplied header.

is_key_ok(keyword)

Return True if the value associated with the named keyword is present in this header and defined.

Parameters

keywordstr

Keyword to check against header.

Returns

is_okbool

True if the header is present and not-None. False otherwise.

static is_keyword_defined(header, keyword)

Return True if the value associated with the named keyword is present in the supplied header and defined.

Parameters

headerdict-lik

Header to use as reference.

keywordstr

Keyword to check against header.

Returns

is_definedbool

True if the header is present and not-None. False otherwise.

classmethod max_detector_exposure_id()

The maximum detector exposure ID expected to be generated by this instrument.

Returns

max_idint

The maximum value.

classmethod max_exposure_id()

The maximum exposure ID expected from this instrument.

Returns

max_exposure_idint

The maximum value.

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

keywordsstr or list of str

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

unitastropy.units.UnitBase

Unit of the item in the header.

defaultfloat, 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.

minimumfloat, optional

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

maximumfloat, optional

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

checkerfunction, 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

qastropy.units.Quantity

Quantity representing the header value.

Raises

KeyError

The supplied header key is not present.

resource_root()

Package resource to use to locate correction resources within an installed package.

Returns

resource_packagestr

Package resource name. None if no package resource are to be used.

resource_rootstr

The name of the resource root. None if no package resources are to be used.

search_paths()

Search paths to use for LSST data when looking for header correction files.

Returns

pathlist

List with a single element containing the full path to the corrections directory within the obs_lsst package.

to_altaz_begin()

to_boresight_airmass()

Airmass of the boresight of the telescope.

Returns

translationfloat

Translated value derived from the header.

to_boresight_rotation_angle()

Angle of the instrument in boresight_rotation_coord frame.

Returns

translationastropy.coordinates.Angle

Translated value derived from the header.

to_boresight_rotation_coord()

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

Returns

translationstr

Translated property.

to_dark_time()

Duration of the exposure with shutter closed (seconds).

Returns

translationastropy.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

translationstr

Translated value derived from the header.

to_detector_name()

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_num()

to_detector_serial()

Serial number/string associated with this detector.

Returns

translationstr

Translated value derived from the header.

to_detector_unique_name()

Return a unique name for the detector.

Base class implementation attempts to combine detector_name with detector_group. Group is only used if not None.

Can be over-ridden by specialist translator class.

Returns

namestr

detector_group``_``detector_name if detector_group is defined, else the detector_name is assumed to be unique. If neither return a valid value an exception is raised.

Raises

NotImplementedError

Raised if neither detector_name nor detector_group is defined.

to_exposure_id()

Unique (with instrument) integer identifier for this observation.

Returns

translationint

Translated value derived from the header.

to_exposure_time()

Duration of the exposure with shutter open (seconds).

Returns

translationastropy.units.Quantity

Translated value derived from the header.

to_instrument()

The instrument used to observe the exposure.

Returns

translationstr

Translated property.

to_location()

to_object()

Object of interest or field name.

Returns

translationstr

Translated property.

to_observation_id()

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

Returns

translationstr

Translated value derived from the header.

to_observation_type()

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

Returns

translationstr

Translated property.

to_physical_filter()

The bandpass filter used for this observation.

Returns

translationstr

Translated value derived from the header.

to_pressure()

Atmospheric pressure outside the dome.

Returns

translationastropy.units.Quantity

Translated value derived from the header.

to_relative_humidity()

Relative humidity outside the dome.

Returns

translationfloat

Translated property.

to_science_program()

Observing program (survey or proposal) identifier.

Returns

translationstr

Translated value derived from the header.

to_telescope()

to_temperature()

Temperature outside the dome.

Returns

translationastropy.units.Quantity

Translated value derived from the header.

to_tracking_radec()

to_visit_id()

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.

Returns

translationint

Translated value derived from the header.

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

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

Parameters

valuefloat

Value to be validated.

defaultfloat

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.

minimumfloat

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

maximumfloat

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

Returns

valuefloat

Either the supplied value, or a default value.