LsstUCDCamTranslator

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

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

Metadata translator for LSST UC Davis test camera data.

This instrument is a test system for individual LSST CCDs. To fit this instrument into the standard naming convention for LSST instruments we use a fixed detector name (S00) and assign a different raft name to each detector. The detector number changes for each CCD.

Attributes Summary

DETECTOR_MAX	Maximum number of detectors to use when calculating the detector_exposure_id.
DETECTOR_NAME	Fixed name of single sensor in raft.
all_properties
cameraPolicyFile
default_resource_package
default_resource_root
default_search_path
detectorMapping
detectorSerials
extensions
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, 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_group_from_num(detector_num)	Helper method to return the detector group from the number.
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(dateobs[, seqnum, …])	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, Any], instrument, obsid, …)	Apply global fixes to a supplied 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, Any], keyword)	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()	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()	Calculate the dark time.
to_datetime_begin()
to_datetime_end()
to_detector_exposure_id()
to_detector_group()	Determine the pseudo raft name associated with this detector.
to_detector_name()	Name of the detector within the instrument (might not be unique if there are detector groups).
to_detector_num()	Determine the number associated with this detector.
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()	Duration of the exposure with shutter open (seconds).
to_instrument()	The instrument used to observe the exposure.
to_location()	Location of the observatory.
to_object()	Object of interest or field name.
to_observation_counter()	Return the sequence number within the observing day.
to_observation_id()
to_observation_reason()
to_observation_type()
to_observing_day()	Return the day of observation as YYYYMMDD integer.
to_physical_filter()	Return the filter name.
to_pressure()	Atmospheric pressure outside the dome.
to_relative_humidity()	Relative humidity outside the dome.
to_science_program()	Calculate the run number for this observation.
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
translator_version()	Return the version string for this translator class.
validate_value(value, default, minimum, maximum)	Validate the supplied value, returning a new value if out of range

Attributes Documentation

DETECTOR_MAX = 10

Maximum number of detectors to use when calculating the detector_exposure_id.

This is rounded up to a power of ten to make those IDs human-decodable.

DETECTOR_NAME = 'S00'

Fixed name of single sensor in raft.

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 at 0x7f3233431dc0>, from_simple=<function simple_to_altaz at 0x7f3233431e50>), '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 at 0x7f3233431940>, from_simple=<function simple_to_angle at 0x7f32334319d0>), '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 at 0x7f3233431820>, from_simple=<function simple_to_exptime at 0x7f32334318b0>), '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 at 0x7f3233431700>, from_simple=<function simple_to_datetime at 0x7f3233431790>), '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 at 0x7f3233431700>, from_simple=<function simple_to_datetime at 0x7f3233431790>), '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 at 0x7f3233431820>, from_simple=<function simple_to_exptime at 0x7f32334318b0>), '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 at 0x7f32334314c0>, from_simple=<function simple_to_earthlocation at 0x7f3233431670>), '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 at 0x7f3233431b80>, from_simple=<function simple_to_pressure at 0x7f3233431c10>), '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 at 0x7f3233431a60>, from_simple=<function simple_to_temperature at 0x7f3233431af0>), '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 at 0x7f3233431ca0>, from_simple=<function simple_to_skycoord at 0x7f3233431d30>), '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-UCDCam'

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'>, '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) → 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.

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_id : int

Unique exposure ID.

detector_num : int

Detector number.

Returns:

detector_exposure_id : int

The calculated ID.

classmethod compute_detector_group_from_num(detector_num)

Helper method to return the detector group from the number.

Parameters:

detector_num : int

Detector number.

Returns:

group : str

Detector group.

Raises:

ValueError

The supplied number is not known.

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

Detector group name. This is generally the raft name.

detector_name : str

Detector name. Checked to ensure it is the expected name.

Returns:

num : int

Detector number.

Raises:

ValueError

The supplied name is not known.

static compute_exposure_id(dateobs, seqnum=0, controller=None)

Helper method to calculate the exposure_id.

Parameters:

dateobs : str

Date of observation in FITS ISO format.

seqnum : int, unused

Sequence number. Ignored.

controller : str, unused

Controller type. Ignored.

Returns:

exposure_id : int

Exposure ID.

classmethod defined_in_this_class(name: str) → Optional[bool]

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) → 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) → 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: MutableMapping[str, Any], instrument: str, obsid: str, filename: Optional[str] = None) → bool

Apply global fixes to a supplied header.

Parameters:

header : dict

The header to correct. Correction is 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

True if a correction was applied.

Notes

This method is intended to support major discrepancies in headers such as:

• Periods of time where headers are known to be incorrect in some way that can be fixed either by deriving the correct value from the existing value or understanding the that correction is static for the given time. This requires that the date header is known.
• The presence of a certain value is always wrong and should be corrected with a new static value regardless of date.

It is assumed that one off problems with headers have been applied before this method is called using the per-obsid correction system.

Usually called from astro_metadata_translator.fix_header.

For log messages, do not assume that the filename will be present. Always write log messages to fall back on using the obsid if filename is None.

is_key_ok(keyword: Optional[str]) → 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]) → 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, minimum: Optional[float] = None, maximum: Optional[float] = None, checker: Optional[Callable] = 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], Optional[str]]

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

Telescope boresight azimuth and elevation at start of observation.

Returns:

translation : <class 'astropy.coordinates.builtin_frames.altaz.AltAz'>

Translated property.

to_boresight_airmass() → Any

Airmass of the boresight of the telescope.

Returns:

translation : <class 'float'>

Translated property.

to_boresight_rotation_angle() → Any

Angle of the instrument in boresight_rotation_coord frame.

Returns:

translation : <class 'astropy.coordinates.angles.Angle'>

Translated property.

to_boresight_rotation_coord() → Any

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

Returns:

translation : <class 'str'>

Translated property.

to_dark_time() → Any

Calculate the dark time.

If a DARKTIME header is not found, the value is assumed to be identical to the exposure time.

Returns:

dark : astropy.units.Quantity

The dark time in seconds.

to_datetime_begin() → Any

to_datetime_end() → Any

to_detector_exposure_id() → Any

to_detector_group() → Any

Determine the pseudo raft name associated with this detector.

Returns:

raft : str

The name of the raft. The raft is derived from the serial number of the detector.

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

Determine the number associated with this detector.

Returns:

num : int

The number of the detector. Each CCD gets a different number.

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()

Generate a unique exposure ID number

Note that SEQNUM is not unique for a given day so instead we convert the ISO date of observation directly to an integer.

Returns:

exposure_id : int

Unique exposure number.

to_exposure_time() → Any

Duration of the exposure with shutter open (seconds).

Returns:

translation : astropy.units.Quantity

Translated value derived from the header.

to_instrument() → Any

The instrument used to observe the exposure.

Returns:

translation : <class 'str'>

Translated property.

to_location() → Any

Location of the observatory.

Returns:

translation : <class 'astropy.coordinates.earth.EarthLocation'>

Translated property.

to_object() → Any

Object of interest or field name.

Returns:

translation : <class 'str'>

Translated property.

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

to_observation_reason() → Any

to_observation_type() → Any

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

Return the filter name.

Uses the FILTER header.

Returns:

filter : str

The filter name. Returns “NONE” if no filter can be determined.

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

Calculate the run number for this observation.

There is no explicit run header, so instead treat each day as the run in YYYY-MM-DD format.

Returns:

run : str

YYYY-MM-DD string corresponding to the date of observation.

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

Requested RA/Dec to track.

Returns:

translation : <class 'astropy.coordinates.sky_coordinate.SkyCoord'>

Translated property.

to_visit_id()

Generate a unique exposure ID number

Note that SEQNUM is not unique for a given day so instead we convert the ISO date of observation directly to an integer.

Returns:

exposure_id : int

Unique exposure number.

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, maximum: Optional[float] = 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.