LatissTranslator

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

Bases: lsst.obs.lsst.translators.lsst.LsstBaseTranslator

Metadata translator for LSST LATISS data from AuxTel.

For lab measurements many values are masked out.

Attributes Summary

DETECTOR_GROUP_NAME	Fixed name of detector group.
DETECTOR_MAX	Maximum number of detectors to use when calculating the detector_exposure_id.
DETECTOR_NAME	Fixed name of single sensor.
all_properties
cameraPolicyFile
default_resource_package
default_resource_root
default_search_path
detectorMapping
detectorSerials
extensions
name	Name of this translation class
supported_instrument	Supports the LATISS 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, Any], …)	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_translatable_headers(filename, …)	Given a file return all the headers usable for metadata translation.
determine_translator(header, Any], filename, …)	Determine a translation class by examining the header
fix_header(header, instrument, obsid[, filename])	Fix an incorrect LATISS header.
is_key_ok(keyword, None])	Return True if the value associated with the named keyword is present in this header and defined.
is_keyword_defined(header, Any], keyword, None])	Return True if the value associated with the named keyword is present in the supplied header and defined.
is_on_sky()	Determine if this is an on-sky observation.
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, Sequence[str]], …)	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()	Calculate airmass at boresight at start of observation.
to_boresight_rotation_angle()	Angle of the instrument in boresight_rotation_coord frame.
to_boresight_rotation_coord()	Boresight rotation angle.
to_dark_time()
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()	Unique (for instrument) integer identifier for the sensor.
to_detector_serial()	Serial number/string associated with this detector.
to_detector_unique_name()	Return a unique name for the detector.
to_exposure_group()	Calculate the exposure group string.
to_exposure_id()	Generate a unique exposure ID number
to_exposure_time()
to_focus_z()	Return the defocal distance of the camera in units of mm.
to_group_counter_end()
to_group_counter_start()
to_has_simulated_content()
to_instrument()	The instrument used to observe the exposure.
to_location()
to_object()	Object of interest or field name.
to_observation_counter()	Return the sequence number within the observing day.
to_observation_id()	Label uniquely identifying this observation (can be related to ‘exposure_id’).
to_observation_reason()
to_observation_type()	Determine the observation type.
to_observing_day()	Return the day of observation as YYYYMMDD integer.
to_physical_filter()	Calculate the physical filter name.
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()
to_visit_id()	Calculate the visit associated with this exposure.
translator_version()	Return the version string for this translator class.
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_MAX = 0

Maximum number of detectors to use when calculating the detector_exposure_id.

DETECTOR_NAME = 'S00'

Fixed name of single sensor.

all_properties = {'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>), '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.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), '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='Duration of the exposure with shutter open (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), '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)}

cameraPolicyFile = None

default_resource_package = 'astro_metadata_translator'

default_resource_root = None

default_search_path = None

detectorMapping = None

detectorSerials = None

extensions = {}

name = 'LSST_LATISS'

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'>, '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'>, 'LSSTCam-PhoSim': <class 'lsst.obs.lsst.translators.phosim.LsstCamPhoSimTranslator'>, 'LSSTCam-imSim': <class 'lsst.obs.lsst.translators.imsim.LsstCamImSimTranslator'>, 'LSSTComCam': <class 'lsst.obs.lsst.translators.comCam.LsstComCamTranslator'>, 'LSST_LATISS': <class 'lsst.obs.lsst.translators.latiss.LatissTranslator'>, 'MegaPrime': <class 'astro_metadata_translator.translators.megaprime.MegaPrimeTranslator'>, 'SDSS': <class 'astro_metadata_translator.translators.sdss.SdssTranslator'>, 'SuprimeCam': <class 'astro_metadata_translator.translators.suprimecam.SuprimeCamTranslator'>}

Methods Documentation

are_keys_ok(keywords: Iterable[str]) → bool

Are the supplied keys all present and defined?

Parameters:

keywords : iterable of str

Keywords to test.

Returns:

all_ok : bool

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.

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: Mapping[str, Any], options: Dict[str, Any], filename: Optional[str, None] = None) → bool

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() → FrozenSet[str]

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.

classmethod compute_detector_info_from_serial(detector_serial)

Helper method to return the detector information from the serial.

Parameters:

detector_serial : str

Detector serial ID.

Returns:

info : tuple 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_group : str

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

detector_name : str

Detector name.

Returns:

num : int

Detector number.

static compute_exposure_id(dayobs, seqnum, controller=None)

Helper method to calculate the exposure_id.

Parameters:

dayobs : str

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.

seqnum : int or str

Sequence number.

controller : str, 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. If it is “H” a 2000 is added to the year component. This sequence continues with “P” and “Q” controllers. None indicates that the controller is not relevant to the exposure ID calculation (generally this is the case for test stand data).

Returns:

exposure_id : int

Exposure ID in form YYYYMMDDnnnnn form.

classmethod defined_in_this_class(name: str) → Optional[bool, None]

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

Parameters:

name : str

Name of the attribute to test.

Returns:

in_class : bool

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:

mapping : dict 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:

info : dict of tuple of (str, str, int)

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

classmethod determine_translatable_headers(filename: str, primary: Optional[MutableMapping[str, Any], None] = None) → Iterator[MutableMapping[str, Any]]

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

This method can optionally be given a header from the file. This header will generally be the primary header or a merge of the first two headers.

In the base class implementation it is assumed that this supplied header is the only useful header for metadata translation and it will be returned unchanged if given. This can avoid unnecesarily re-opening the file and re-reading the header when the content is already known.

If no header is supplied, a header will be read from the supplied file using read_basic_metadata_from_file, allowing it to merge the primary and secondary header of a multi-extension FITS file. Subclasses can read the header from the data file using whatever technique is best for that instrument.

Subclasses can return multiple headers and ignore the externally supplied header. They can also merge it with another header and return a new derived header if that is required by the particular data file. There is no requirement for the supplied header to be used.

Parameters:

filename : str

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

primary : dict-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. For many instruments where the primary header is the only relevant header, the primary header will be returned with no further action.

Yields:

headers : iterator of dict-like

A header usable for metadata translation. For this base implementation it will be either the supplied primary header or a header read from the file. This implementation will only ever yield a single header.

Notes

Each translator class can have code specifically tailored to its own file format. It is important not to call this method with an incorrect translator class. 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.

classmethod determine_translator(header: Mapping[str, Any], filename: Optional[str, None] = None) → Type[astro_metadata_translator.translator.MetadataTranslator]

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.

classmethod fix_header(header, instrument, obsid, filename=None)

Fix an incorrect LATISS header.

Parameters:

header : dict

The header to update. Updates are in place.

instrument : str

The name of the instrument.

obsid : str

Unique observation identifier associated with this header. Will always be provided.

filename : str, optional

Filename associated with this header. May not be set since headers can be fixed independently of any filename being known.

Returns:

modified = bool

Returns True if the header was updated.

Notes

This method does not apply per-obsid corrections. The following corrections are applied:

• On June 24th 2019 the detector was changed from ITL-3800C-098 to ITL-3800C-068. The header is intended to be correct in the future.
• In late 2019 the DATE-OBS and MJD-OBS headers were reporting 1970 dates. To correct, the DATE/MJD headers are copied in to replace them and the -END headers are cleared.
• Until November 2019 the IMGTYPE was set in the GROUPID header. The value is moved to IMGTYPE.
• SHUTTIME is always forced to be None.

Corrections are reported as debug level log messages.

See fix_header for details of the general process.

is_key_ok(keyword: Optional[str, None]) → bool

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

Parameters:

keyword : str

Keyword to check against header.

Returns:

is_ok : bool

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

static is_keyword_defined(header: Mapping[str, Any], keyword: Optional[str, None]) → bool

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

Parameters:

header : dict-lik

Header to use as reference.

keyword : str

Keyword to check against header.

Returns:

is_defined : bool

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

is_on_sky()

Determine if this is an on-sky observation.

Returns:

is_on_sky : bool

Returns True if this is a observation on sky on the summit.

classmethod max_detector_exposure_id()

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

Returns:

max_id : int

The maximum value.

classmethod max_exposure_id()

The maximum exposure ID expected from this instrument.

Returns:

max_exposure_id : int

The maximum value.

quantity_from_card(keywords: Union[str, Sequence[str]], unit: astropy.units.core.Unit, default: Optional[float, None] = None, minimum: Optional[float, None] = None, maximum: Optional[float, None] = None, checker: Optional[Callable, None] = None) → astropy.units.quantity.Quantity

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.

resource_root() → Tuple[Optional[str, None], Optional[str, None]]

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

Returns:

resource_package : str

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

resource_root : str

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:

path : list

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

to_altaz_begin() → Any

to_boresight_airmass() → Any

Calculate airmass at boresight at start of observation.

Notes

Early data are missing AMSTART header so we fall back to calculating it from ELSTART.

to_boresight_rotation_angle() → Any

Angle of the instrument in boresight_rotation_coord frame.

Returns:

translation : astropy.coordinates.Angle

Translated value derived from the header.

to_boresight_rotation_coord() → Any

Boresight rotation angle.

Only relevant for science observations.

to_dark_time() → Any

to_datetime_begin() → Any

to_datetime_end() → Any

to_detector_exposure_id() → Any

to_detector_group() → Any

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

Returns:

translation : <class 'str'>

Translated property.

to_detector_name() → Any

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

Returns:

translation : <class 'str'>

Translated property.

to_detector_num() → Any

Unique (for instrument) integer identifier for the sensor.

Returns:

translation : <class 'int'>

Translated property.

to_detector_serial() → Any

Serial number/string associated with this detector.

Returns:

translation : str

Translated value derived from the header.

to_detector_unique_name() → Any

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:

name : str

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_group() → Any

Calculate the exposure group string.

For LSSTCam and LATISS this is read from the GROUPID header. If that header is missing the exposure_id is returned instead as a string.

to_exposure_id() → Any

Generate a unique exposure ID number

This is a combination of DAYOBS and SEQNUM, and optionally CONTRLLR.

Returns:

exposure_id : int

Unique exposure number.

to_exposure_time() → Any

to_focus_z() → Any

Return the defocal distance of the camera in units of mm. If there is no FOCUSZ value in the header it will return the default 0.0mm value.

Returns:

focus_z: astropy.units.Quantity

The defocal distance from header in mm or the 0.0mm default

to_group_counter_end() → Any

to_group_counter_start() → Any

to_has_simulated_content() → Any

to_instrument() → Any

The instrument used to observe the exposure.

Returns:

translation : <class 'str'>

Translated property.

to_location() → Any

to_object() → Any

Object of interest or field name.

Returns:

translation : str

Translated value derived from the header.

to_observation_counter() → Any

Return the sequence number within the observing day.

Returns:

counter : int

The sequence number for this day.

to_observation_id() → Any

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

Returns:

translation : str

Translated value derived from the header.

to_observation_reason() → Any

to_observation_type() → Any

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_observing_day() → Any

Return the day of observation as YYYYMMDD integer.

For LSSTCam and other compliant instruments this is the value of the DAYOBS header.

Returns:

obs_day : int

The day of observation.

to_physical_filter() → Any

Calculate the physical filter name.

Returns:

filter : str

Name of filter. A combination of FILTER and GRATING headers joined by a “~”. The filter and grating are always combined. The filter or grating part will be “none” if no value is specified. Uses “empty” if any of the filters or gratings indicate an “empty_N” name. “unknown” indicates that the filter is not defined anywhere but we think it should be. “none” indicates that the filter was not defined but the observation is a dark or bias.

to_pressure() → Any

Atmospheric pressure outside the dome.

Returns:

translation : <class 'astropy.units.quantity.Quantity'>

Translated property.

to_relative_humidity() → Any

Relative humidity outside the dome.

Returns:

translation : <class 'float'>

Translated property.

to_science_program() → Any

Observing program (survey or proposal) identifier.

Returns:

translation : str

Translated value derived from the header.

to_telescope() → Any

Full name of the telescope.

Returns:

translation : <class 'str'>

Translated property.

to_temperature() → Any

Temperature outside the dome.

Returns:

translation : <class 'astropy.units.quantity.Quantity'>

Translated property.

to_tracking_radec() → Any

to_visit_id() → Any

Calculate the visit associated with this exposure.

Notes

For LATISS and LSSTCam the default visit is derived from the exposure group. For other instruments we return the exposure_id.

classmethod translator_version() → str

Return the version string for this translator class.

Returns:

version : str

String identifying the version of this translator.

Notes

Assumes that the version is available from the __version__ variable in the parent module. If this is not the case a translator should subclass this method.

static validate_value(value: float, default: float, minimum: Optional[float, None] = None, maximum: Optional[float, None] = None) → float

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.