LsstCamPhoSimTranslator¶
- class lsst.obs.lsst.translators.LsstCamPhoSimTranslator(header: Mapping[str, Any], filename: str | None = None)¶
Bases:
LsstSimTranslator
Metadata translator for LSSTCam PhoSim data.
Attributes Summary
Maximum number of detectors to use when calculating the detector_exposure_id.
All the valid properties for this translator including extensions.
Path to policy file relative to obs_lsst root.
Module name to use to locate the correction resources.
Default package resource path root to use to locate header correction files within the
default_resource_package
package.Default search path to use to locate header correction files.
Mapping of detector name to detector number and serial.
Mapping of detector serial number to raft, number, and name.
Extension properties (
str
:PropertyDefinition
)Name of this translation class
Name of instrument understood by this translation class.
All registered metadata translation classes.
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)Determine if a header can be translated with different criteria.
Cards used during metadata extraction.
compute_detector_exposure_id
(exposure_id, ...)Compute the detector exposure ID from detector number and exposure ID.
Helper method to return the detector information from the serial.
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.
Returns the mapping of full name to detector ID and serial.
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[, filename])Determine a translation class by examining the header.
fix_header
(header, instrument, obsid[, filename])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, keyword)Return
True
if the value associated with the named keyword is present in the supplied header and defined.Determine if this is an on-sky observation.
The maximum detector exposure ID expected to be generated by this instrument.
The maximum exposure ID expected from this instrument.
Return the YYYYMMDD integer corresponding to the observing day.
observing_date_to_offset
(observing_date)Return the offset to use when calculating the observing day.
quantity_from_card
(keywords, unit[, ...])Calculate a Astropy Quantity from a header card and a unit.
Return package resource to use to locate correction resources within an installed package.
Search paths to use for LSST data when looking for header correction files.
Return value of altaz_begin from headers.
Airmass of the boresight of the telescope.
Return value of boresight_rotation_angle from headers.
Coordinate frame of the instrument rotation angle (options: sky, unknown).
Return whether the observation can see the sky or not.
Duration of the exposure with shutter closed (seconds).
Calculate start time of observation.
Calculate end time of observation.
Return value of detector_exposure_id from headers.
Collection name of which this detector is a part.
Name of the detector within the instrument (might not be unique if there are detector groups).
Return value of detector_num from headers.
Serial number/string associated with this detector.
Return a unique name for the detector.
Calculate the exposure group string.
Unique (with instrument) integer identifier for this observation.
Duration of the exposure with shutter open (seconds).
Return the defocal distance of the camera in units of mm.
Return the observation counter of the observation that ends this group.
Return the observation counter of the observation that began this group.
Boolean indicating whether any part of this observation was simulated.
The instrument used to observe the exposure.
Calculate the observatory location.
Object of interest or field name.
Counter of this observation.
Label uniquely identifying this observation (can be related to 'exposure_id').
Return the reason this observation was taken.
Type of observation (currently: science, dark, flat, bias, focus).
Return the day of observation as YYYYMMDD integer.
Return the offset required to calculate observing day.
The bandpass filter used for this observation.
Atmospheric pressure outside the dome.
Relative humidity outside the dome.
Observing program (survey or proposal) identifier.
Full name of the telescope.
Temperature outside the dome.
Return value of tracking_radec from headers.
ID of the Visit this Exposure is associated with.
Return the version string for this translator class.
unpack_exposure_id
(exposure_id)Unpack an exposure ID into dayobs, seqnum, and controller.
validate_value
(value, default[, minimum, ...])Validate the supplied value, returning a new value if out of range.
Attributes Documentation
- DETECTOR_MAX = 1000¶
Maximum number of detectors to use when calculating the detector_exposure_id.
Note that because this is the maximum number of detectors, for zero-based
detector_num
values this is one greater than the maximumdetector_num
. It is also often rounded up to the nearest power of 10 anyway, to allowdetector_exposure_id
values to be easily decoded by humans.
- all_properties: dict[str, PropertyDefinition] = {'altaz_begin': PropertyDefinition(doc='Telescope boresight azimuth and elevation at start of observation.', str_type='astropy.coordinates.AltAz', py_type=<class 'astropy.coordinates.builtin_frames.altaz.AltAz'>, to_simple=<function altaz_to_simple>, from_simple=<function simple_to_altaz>), 'boresight_airmass': PropertyDefinition(doc='Airmass of the boresight of the telescope.', str_type='float', py_type=<class 'float'>, to_simple=None, from_simple=None), 'boresight_rotation_angle': PropertyDefinition(doc='Angle of the instrument in boresight_rotation_coord frame.', str_type='astropy.coordinates.Angle', py_type=<class 'astropy.coordinates.angles.core.Angle'>, to_simple=<function angle_to_simple>, from_simple=<function simple_to_angle>), 'boresight_rotation_coord': PropertyDefinition(doc='Coordinate frame of the instrument rotation angle (options: sky, unknown).', str_type='str', py_type=<class 'str'>, to_simple=None, from_simple=None), 'can_see_sky': PropertyDefinition(doc='True if the observation is looking at sky, False if it is definitely not looking at the sky. None indicates that it is not known whether sky could be seen.', str_type='bool', py_type=<class 'bool'>, to_simple=None, from_simple=None), 'dark_time': PropertyDefinition(doc='Duration of the exposure with shutter closed (seconds).', str_type='astropy.units.Quantity', py_type=<class 'astropy.units.quantity.Quantity'>, to_simple=<function exptime_to_simple>, from_simple=<function simple_to_exptime>), 'datetime_begin': PropertyDefinition(doc='Time of the start of the observation.', str_type='astropy.time.Time', py_type=<class 'astropy.time.core.Time'>, to_simple=<function datetime_to_simple>, from_simple=<function simple_to_datetime>), 'datetime_end': PropertyDefinition(doc='Time of the end of the observation.', str_type='astropy.time.Time', py_type=<class 'astropy.time.core.Time'>, to_simple=<function datetime_to_simple>, from_simple=<function simple_to_datetime>), 'detector_exposure_id': PropertyDefinition(doc='Unique integer identifier for this detector in this exposure.', str_type='int', py_type=<class 'int'>, to_simple=None, from_simple=None), 'detector_group': PropertyDefinition(doc='Collection name of which this detector is a part. Can be None if there are no detector groupings.', str_type='str', py_type=<class 'str'>, to_simple=None, from_simple=None), 'detector_name': PropertyDefinition(doc='Name of the detector within the instrument (might not be unique if there are detector groups).', str_type='str', py_type=<class 'str'>, to_simple=None, from_simple=None), 'detector_num': PropertyDefinition(doc='Unique (for instrument) integer identifier for the sensor.', str_type='int', py_type=<class 'int'>, to_simple=None, from_simple=None), 'detector_serial': PropertyDefinition(doc='Serial number/string associated with this detector.', str_type='str', py_type=<class 'str'>, to_simple=None, from_simple=None), 'detector_unique_name': PropertyDefinition(doc='Unique name of the detector within the focal plane, generally combining detector_group with detector_name.', str_type='str', py_type=<class 'str'>, to_simple=None, from_simple=None), 'exposure_group': PropertyDefinition(doc="Label to use to associate this exposure with others (can be related to 'exposure_id').", str_type='str', py_type=<class 'str'>, to_simple=None, from_simple=None), 'exposure_id': PropertyDefinition(doc='Unique (with instrument) integer identifier for this observation.', str_type='int', py_type=<class 'int'>, to_simple=None, from_simple=None), 'exposure_time': PropertyDefinition(doc='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), 'observing_day_offset': PropertyDefinition(doc='Offset to subtract from an observation date when calculating the observing day. Conversely, the offset to add to an observing day when calculating the time span of a day.', str_type='astropy.time.TimeDelta', py_type=<class 'astropy.time.core.TimeDelta'>, to_simple=<function timedelta_to_simple>, from_simple=<function simple_to_timedelta>), 'physical_filter': PropertyDefinition(doc='The bandpass filter used for this observation.', str_type='str', py_type=<class 'str'>, to_simple=None, from_simple=None), 'pressure': PropertyDefinition(doc='Atmospheric pressure outside the dome.', str_type='astropy.units.Quantity', py_type=<class 'astropy.units.quantity.Quantity'>, to_simple=<function pressure_to_simple>, from_simple=<function simple_to_pressure>), 'relative_humidity': PropertyDefinition(doc='Relative humidity outside the dome.', str_type='float', py_type=<class 'float'>, to_simple=None, from_simple=None), 'science_program': PropertyDefinition(doc='Observing program (survey or proposal) identifier.', str_type='str', py_type=<class 'str'>, to_simple=None, from_simple=None), 'telescope': PropertyDefinition(doc='Full name of the telescope.', str_type='str', py_type=<class 'str'>, to_simple=None, from_simple=None), 'temperature': PropertyDefinition(doc='Temperature outside the dome.', str_type='astropy.units.Quantity', py_type=<class 'astropy.units.quantity.Quantity'>, to_simple=<function temperature_to_simple>, from_simple=<function simple_to_temperature>), 'tracking_radec': PropertyDefinition(doc='Requested RA/Dec to track.', str_type='astropy.coordinates.SkyCoord', py_type=<class 'astropy.coordinates.sky_coordinate.SkyCoord'>, to_simple=<function skycoord_to_simple>, from_simple=<function simple_to_skycoord>), 'visit_id': PropertyDefinition(doc='ID of the Visit this Exposure is associated with.\n\nScience observations should essentially always be\nassociated with a visit, but calibration observations\nmay not be.', str_type='int', py_type=<class 'int'>, to_simple=None, from_simple=None)}¶
All the valid properties for this translator including extensions.
- cameraPolicyFile = 'policy/phosim.yaml'¶
Path to policy file relative to obs_lsst root.
- default_resource_package = 'astro_metadata_translator'¶
Module name to use to locate the correction resources.
- default_resource_root: str | None = None¶
Default package resource path root to use to locate header correction files within the
default_resource_package
package.
- default_search_path: Sequence[str] | None = None¶
Default search path to use to locate header correction files.
- detectorMapping = None¶
Mapping of detector name to detector number and serial.
- detectorSerials = None¶
Mapping of detector serial number to raft, number, and name.
- extensions: dict[str, PropertyDefinition] = {}¶
Extension properties (
str
:PropertyDefinition
)Some instruments have important properties beyond the standard set; this is the place to declare that they exist, and they will be treated in the same way as the standard set, except that their names will everywhere be prefixed with
ext_
.Each property is indexed by name (
str
), with a correspondingPropertyDefinition
.
- translators: dict[str, type[MetadataTranslator]] = {'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'>, 'LSSTComCamSim': <class 'lsst.obs.lsst.translators.comCamSim.LsstComCamSimTranslator'>, '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'>}¶
All registered metadata translation classes.
Methods Documentation
- classmethod can_translate(header, filename=None)¶
Indicate whether this translation class can translate the supplied header.
There is no
INSTRUME
header in PhoSim data. Instead we use theCREATOR
header.
- classmethod can_translate_with_options(header: Mapping[str, Any], options: dict[str, Any], filename: str | None = None) bool ¶
Determine if a header can be translated with different criteria.
- 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.
- header
- Returns:
Notes
Intended to be used from within
can_translate
implementations for specific translators. Is not intended to be called directly fromdetermine_translator
.
- 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.
- classmethod compute_detector_info_from_serial(detector_serial)¶
Helper method to return the detector information from the serial.
- classmethod compute_detector_num_from_name(detector_group, detector_name)¶
Helper method to return the detector number from the name.
- static compute_exposure_id(dayobs, seqnum, controller=None)¶
Helper method to calculate the exposure_id.
- Parameters:
- dayobs
str
orint
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
orstr
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).
- dayobs
- Returns:
- exposure_id
int
Exposure ID in form YYYYMMDDnnnnn form.
- exposure_id
- classmethod defined_in_this_class(name: str) bool | None ¶
Report if the specified class attribute is defined specifically in this class.
- Parameters:
- name
str
Name of the attribute to test.
- name
- 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. ReturnsNone
if the attribute is not defined anywhere in the class hierarchy (which can happen if translators have typos in their mapping tables).
- in_class
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:
- 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.
- classmethod determine_translatable_headers(filename, primary=None)¶
Given a file return all the headers usable for metadata translation.
Phosim splits useful metadata between the primary header and the amplifier headers. A single header is returned as a merge of the first two.
- Parameters:
- Yields:
- headersiterator of
dict
-like The primary header merged with the secondary header.
- headersiterator of
Notes
This translator class is specifically tailored to raw PhoSim data and is not designed to work with general FITS files. The normal paradigm is for the caller to have read the first header and then called
determine_translator()
on the result to work out which translator class to then call to obtain the real headers to be used for translation.
- classmethod determine_translator(header: Mapping[str, Any], filename: str | None = None) type[astro_metadata_translator.translator.MetadataTranslator] ¶
Determine a translation class by examining the header.
- Parameters:
- Returns:
- translator
MetadataTranslator
Translation class that knows how to extract metadata from the supplied header.
- translator
- Raises:
- ValueError
None of the registered translation classes understood the supplied header.
- classmethod fix_header(header: MutableMapping[str, Any], instrument: str, obsid: str, filename: str | None = 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.
- header
- Returns:
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
iffilename
isNone
.
- is_key_ok(keyword: str | None) bool ¶
Return
True
if the value associated with the named keyword is present in this header and defined.
- static is_keyword_defined(header: Mapping[str, Any], keyword: str | None) bool ¶
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.
- Returns:
- is_on_sky
bool
Returns True if this is a observation on sky on the summit.
- is_on_sky
- classmethod max_detector_exposure_id()¶
The maximum detector exposure ID expected to be generated by this instrument.
- Returns:
- max_id
int
The maximum value.
- max_id
- classmethod max_exposure_id()¶
The maximum exposure ID expected from this instrument.
- Returns:
- max_exposure_id
int
The maximum value.
- max_exposure_id
- classmethod observing_date_to_observing_day(observing_date: Time, offset: TimeDelta | int | None) int ¶
Return the YYYYMMDD integer corresponding to the observing day.
The offset is subtracted from the time of observation before calculating the year, month and day.
- Parameters:
- observing_date
astropy.time.Time
The observation date.
- offset
astropy.time.TimeDelta
|numbers.Real
| None The offset to subtract from the observing date when calculating the observing day. If a plain number is given it is taken to be in units of seconds. If
None
no offset is applied.
- observing_date
- Returns:
- day
int
The observing day as an integer of form YYYYMMDD.
- day
Notes
For example, if the offset is +12 hours both 2023-07-06T13:00 and 2023-07-07T11:00 will return an observing day of 20230706 because the observing day goes from 2023-07-06T12:00 to 2023-07-07T12:00.
- classmethod observing_date_to_offset(observing_date: Time) TimeDelta | None ¶
Return the offset to use when calculating the observing day.
- Parameters:
- observing_date
astropy.time.Time
The date of the observation. Unused.
- observing_date
- Returns:
- offset
astropy.time.TimeDelta
The offset to apply. The default implementation returns a fixed number but subclasses can return a different value depending on whether the instrument is in the instrument lab or on the mountain.
- offset
- quantity_from_card(keywords: str | Sequence[str], unit: Unit, default: float | None = None, minimum: float | None = None, maximum: float | None = None, checker: Callable | None = None) Quantity ¶
Calculate a Astropy Quantity from a header card and a unit.
- Parameters:
- keywords
str
orlist
ofstr
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
Callable
, 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
.
- keywords
- Returns:
- q
astropy.units.Quantity
Quantity representing the header value.
- q
- Raises:
- KeyError
The supplied header key is not present.
- resource_root() tuple[str | None, str | None] ¶
Return 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.
- Returns:
- path
list
List with a single element containing the full path to the
corrections
directory within theobs_lsst
package.
- path
- to_altaz_begin() Any ¶
Return value of altaz_begin from headers.
Telescope boresight azimuth and elevation at start of observation.
- Returns:
- altaz_begin
astropy.coordinates.AltAz
The translated property.
- altaz_begin
- to_boresight_airmass() Any ¶
Airmass of the boresight of the telescope.
- Returns:
- translation
float
Translated value derived from the header.
- translation
- to_boresight_rotation_angle() Any ¶
Return value of boresight_rotation_angle from headers.
Angle of the instrument in boresight_rotation_coord frame.
- Returns:
- boresight_rotation_angle
astropy.coordinates.Angle
The translated property.
- boresight_rotation_angle
- to_boresight_rotation_coord() Any ¶
Coordinate frame of the instrument rotation angle (options: sky, unknown).
- Returns:
- translation
str
Translated property.
- translation
- to_can_see_sky() Any ¶
Return whether the observation can see the sky or not.
- Returns:
Notes
The base class translator uses a simple heuristic of returning
True
if the observation type is “science” or “object” andFalse
if the observation type is “bias” or “dark”. For all other cases it will returnNone
.
- to_dark_time() Any ¶
Duration of the exposure with shutter closed (seconds).
- Returns:
- translation
astropy.units.Quantity
Translated value derived from the header.
- translation
- to_datetime_begin() Any ¶
Calculate start time of observation.
Uses FITS standard
MJD-BEG
orDATE-BEG
, in conjunction with theTIMESYS
header. Will fallback to usingMJD-OBS
orDATE-OBS
if the-BEG
variants are not found.- Returns:
- start_time
astropy.time.Time
orNone
Time corresponding to the start of the observation. Returns
None
if no date can be found.
- start_time
- to_datetime_end() Any ¶
Calculate end time of observation.
Uses FITS standard
MJD-END
orDATE-END
, in conjunction with theTIMESYS
header.- Returns:
- start_time
astropy.time.Time
Time corresponding to the end of the observation.
- start_time
- to_detector_exposure_id() Any ¶
Return value of detector_exposure_id from headers.
Unique integer identifier for this detector in this exposure.
- Returns:
- detector_exposure_id
int
The translated property.
- detector_exposure_id
- to_detector_group() Any ¶
Collection name of which this detector is a part. Can be None if there are no detector groupings.
- Returns:
- translation
str
Translated value derived from the header.
- translation
- to_detector_name() Any ¶
Name of the detector within the instrument (might not be unique if there are detector groups).
- Returns:
- translation
str
Translated value derived from the header.
- translation
- to_detector_num() Any ¶
Return value of detector_num from headers.
Unique (for instrument) integer identifier for the sensor.
- Returns:
- detector_num
int
The translated property.
- detector_num
- to_detector_serial() Any ¶
Serial number/string associated with this detector.
- Returns:
- translation
str
Translated value derived from the header.
- translation
- to_detector_unique_name() Any ¶
Return a unique name for the detector.
Base class implementation attempts to combine
detector_name
withdetector_group
. Group is only used if notNone
.Can be over-ridden by specialist translator class.
- Returns:
- name
str
detector_group``_``detector_name
ifdetector_group
is defined, else thedetector_name
is assumed to be unique. If neither return a valid value an exception is raised.
- name
- 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 ¶
Unique (with instrument) integer identifier for this observation.
- Returns:
- translation
int
Translated value derived from the header.
- translation
- to_exposure_time() Any ¶
Duration of the exposure with shutter open (seconds).
- Returns:
- translation
astropy.units.Quantity
Translated value derived from the header.
- translation
- 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
- focus_z:
- to_group_counter_end() Any ¶
Return the observation counter of the observation that ends this group.
The definition of the relevant group is up to the metadata translator. It can be the last observation in the exposure_group or the last observation in the visit, but must be derivable from the metadata of this observation. It is of course possible that the last observation in the group does not exist if a sequence of observations was not completed.
- Returns:
- counter
int
The observation counter for the end of the relevant group. Default implementation always returns the observation counter of this observation.
- counter
- to_group_counter_start() Any ¶
Return the observation counter of the observation that began this group.
The definition of the relevant group is up to the metadata translator. It can be the first observation in the exposure_group or the first observation in the visit, but must be derivable from the metadata of this observation.
- Returns:
- counter
int
The observation counter for the start of the relevant group. Default implementation always returns the observation counter of this observation.
- counter
- to_has_simulated_content() Any ¶
Boolean indicating whether any part of this observation was simulated.
- Returns:
- translation
bool
Translated property.
- translation
- to_instrument() Any ¶
The instrument used to observe the exposure.
- Returns:
- translation
str
Translated property.
- translation
- to_location() Any ¶
Calculate the observatory location.
Uses FITS standard
OBSGEO-
headers.- Returns:
- location
astropy.coordinates.EarthLocation
An object representing the location of the telescope.
- location
- to_observation_counter() Any ¶
Counter of this observation. Can be counter within observing_day or a global counter. Likely to be observatory specific.
- Returns:
- translation
int
Translated property.
- translation
- to_observation_id() Any ¶
Label uniquely identifying this observation (can be related to ‘exposure_id’).
- Returns:
- translation
str
Translated value derived from the header.
- translation
- to_observation_reason() Any ¶
Return the reason this observation was taken.
Base class implementation returns the
science
if theobservation_type
is science, elseunknown
. A subclass may do something different.- Returns:
- name
str
The reason for this observation.
- name
- to_observation_type() Any ¶
Type of observation (currently: science, dark, flat, bias, focus).
- Returns:
- translation
str
Translated property.
- translation
- 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.
- obs_day
- to_observing_day_offset() Any ¶
Return the offset required to calculate observing day.
Base class implementation returns
None
.- Returns:
- offset
astropy.time.TimeDelta
orNone
The offset to apply. Returns
None
if the offset is not defined.
- offset
Notes
This offset must be subtracted from a time of observation to calculate the observing day. This offset must be added to the YYYYMMDDT00:00 observing day to calculate the time span coverage of the observing day.
- to_physical_filter() Any ¶
The bandpass filter used for this observation.
- Returns:
- translation
str
Translated value derived from the header.
- translation
- to_pressure() Any ¶
Atmospheric pressure outside the dome.
- Returns:
- translation
astropy.units.Quantity
Translated value derived from the header.
- translation
- to_relative_humidity() Any ¶
Relative humidity outside the dome.
- Returns:
- translation
float
Translated property.
- translation
- to_science_program() Any ¶
Observing program (survey or proposal) identifier.
- Returns:
- translation
str
Translated value derived from the header.
- translation
- to_telescope() Any ¶
Full name of the telescope.
- Returns:
- translation
str
Translated value derived from the header.
- translation
- to_temperature() Any ¶
Temperature outside the dome.
- Returns:
- translation
astropy.units.Quantity
Translated value derived from the header.
- translation
- to_tracking_radec() Any ¶
Return value of tracking_radec from headers.
Requested RA/Dec to track.
- Returns:
- tracking_radec
astropy.coordinates.SkyCoord
The translated property.
- tracking_radec
- to_visit_id() Any ¶
ID of the Visit this Exposure is associated with.
Science observations should essentially always be associated with a visit, but calibration observations may not be.
- Returns:
- translation
int
Translated value derived from the header.
- translation
- classmethod translator_version() str ¶
Return the version string for this translator class.
- Returns:
- version
str
String identifying the version of this translator.
- version
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 unpack_exposure_id(exposure_id)¶
Unpack an exposure ID into dayobs, seqnum, and controller.
- Parameters:
- exposure_id
int
Integer exposure ID produced by
compute_exposure_id
.
- exposure_id
- Returns:
- dayobs
str
Day of observation as a YYYYMMDD string.
- seqnum
int
Sequence number.
- controller
str
Controller code. Will be
O
(but should be ignored) for IDs produced by callingcompute_exposure_id
withcontroller=None
.
- dayobs
- static validate_value(value: float, default: float, minimum: float | None = None, maximum: 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.
- value
- Returns:
- value
float
Either the supplied value, or a default value.
- value