DarkEnergyCameraRawFormatter

class lsst.obs.decam.DarkEnergyCameraRawFormatter(*args, **kwargs)

Bases: FitsRawFormatterBase

Attributes Summary

checked_parameters	The parameters passed by the butler user, after checking them against the storage class and transforming None into an empty dict (dict).
dataId	Return Data ID associated with this formatter (DataCoordinate).
extension
fileDescriptor	File descriptor associated with this formatter (FileDescriptor).
filterDefinitions
metadata	The metadata read from this file.
observationInfo	The ObservationInfo extracted from this file's metadata (ObservationInfo, read-only).
supportedExtensions	Set of all extensions supported by this formatter.
supportedWriteParameters	Parameters understood by this formatter that can be used to control how a dataset is serialized.
unsupportedParameters	Support all parameters.
wcsFlipX	Control whether the WCS is flipped in the X-direction (bool)
writeParameters	Parameters to use when writing out datasets.
writeRecipes	Detailed write Recipes indexed by recipe name.

Methods Summary

attachComponentsFromMetadata(exposure)	Attach all lsst.afw.image.Exposure components derived from metadata (including the stripped metadata itself).
can_read_bytes()	Indicate if this formatter can format from bytes.
fromBytes(serializedDataset[, component])	Read serialized data into a Dataset or its component.
fromMetadata(metadata[, obsInfo, ...])	Construct a possibly-limited formatter from known metadata.
getDetector(id)	Return the detector that acquired this raw exposure.
isOnSky()	Boolean to determine if the exposure is thought to be on the sky.
makeFilterLabel()	Construct a FilterLabel from metadata.
makeRawSkyWcsFromBoresight(boresight, ...)	Class method to make a raw sky WCS from boresight and detector.
makeUpdatedLocation(location)	Return a new Location updated with this formatter's extension.
makeVisitInfo()	Construct a VisitInfo from metadata.
makeWcs(visitInfo, detector)	Create a SkyWcs from information about the exposure.
name()	Return the fully qualified name of the formatter.
predictPath()	Return the path that would be returned by write.
read([component])	Read a Dataset.
readComponent(component)	Read a component dataset.
readFull()	Read the full dataset (while still accounting for parameters).
readImage()	Read just the image component of the Exposure.
readMetadata()	Read all header metadata directly into a PropertyList.
segregateParameters([parameters])	Segregate the supplied parameters.
stripMetadata()	Remove metadata entries that are parsed into components.
toBytes(inMemoryDataset)	Serialize the Dataset to bytes based on formatter.
validateExtension(location)	Check the extension of the provided location for compatibility.
validateWriteRecipes(recipes)	Validate supplied recipes for this formatter.
write(inMemoryDataset)	Write a Python object to a file.

Attributes Documentation

checked_parameters

dataId

Return Data ID associated with this formatter (DataCoordinate).

extension = '.fits'

fileDescriptor

File descriptor associated with this formatter (FileDescriptor).

Read-only property.

filterDefinitions = <lsst.obs.base.filters.FilterDefinitionCollection object>

metadata

The metadata read from this file. It will be stripped as components are extracted from it (lsst.daf.base.PropertyList).

observationInfo

The ObservationInfo extracted from this file’s metadata (ObservationInfo, read-only).

supportedExtensions: ClassVar[Set[str]] = frozenset({'.fit', '.fits', '.fits.fz', '.fits.gz', '.fz'})

Set of all extensions supported by this formatter.

Only expected to be populated by Formatters that write files. Any extension assigned to the extension property will be automatically included in the list of supported extensions.

supportedWriteParameters: ClassVar[Set[str] | None] = None

Parameters understood by this formatter that can be used to control how a dataset is serialized. None indicates that no parameters are supported.

unsupportedParameters: ClassVar[Set[str]] = frozenset({})

Support all parameters.

wcsFlipX = True

Control whether the WCS is flipped in the X-direction (bool)

writeParameters

Parameters to use when writing out datasets.

writeRecipes

Detailed write Recipes indexed by recipe name.

Methods Documentation

attachComponentsFromMetadata(exposure)

Attach all lsst.afw.image.Exposure components derived from metadata (including the stripped metadata itself).

Parameters:

exposurelsst.afw.image.Exposure

Exposure to attach components to (modified in place). Must already have a detector attached.

classmethod can_read_bytes() → bool

Indicate if this formatter can format from bytes.

Returns:

canbool

True if the fromBytes method is implemented.

fromBytes(serializedDataset: bytes, component: str | None = None) → object

Read serialized data into a Dataset or its component.

Parameters:

serializedDatasetbytes

Bytes object to unserialize.

componentstr, optional

Component to read from the Dataset. Only used if the StorageClass for reading differed from the StorageClass used to write the file.

Returns:

inMemoryDatasetobject

The requested data as a Python object. The type of object is controlled by the specific formatter.

classmethod fromMetadata(metadata, obsInfo=None, storageClass=None, location=None)

Construct a possibly-limited formatter from known metadata.

Parameters:

metadatalsst.daf.base.PropertyList

Raw header metadata, with any fixes (see astro_metadata_translator.fix_header) applied but nothing stripped.

obsInfoastro_metadata_translator.ObservationInfo, optional

Structured information already extracted from metadata. If not provided, will be read from metadata on first use.

storageClasslsst.daf.butler.StorageClass, optional

StorageClass for this file. If not provided, the formatter will only support makeWcs, makeVisitInfo, makeFilter, and other operations that operate purely on metadata and not the actual file.

locationlsst.daf.butler.Location, optional.

Location of the file. If not provided, the formatter will only support makeWcs, makeVisitInfo, makeFilter, and other operations that operate purely on metadata and not the actual file.

Returns:

formatterFitsRawFormatterBase

An instance of cls.

getDetector(id)

Return the detector that acquired this raw exposure.

Parameters:

idint

The identifying number of the detector to get.

Returns:

detectorDetector

The detector associated with that id.

isOnSky()

Boolean to determine if the exposure is thought to be on the sky.

Returns:

onSkybool

Returns True if the observation looks like it was taken on the sky. Returns False if this observation looks like a calibration observation.

Notes

If there is tracking RA/Dec information associated with the observation it is assumed that the observation is on sky. Currently the observation type is not checked.

makeFilterLabel()

Construct a FilterLabel from metadata.

Returns:

filterFilterLabel

Object that identifies the filter for this image.

classmethod makeRawSkyWcsFromBoresight(boresight, orientation, detector)

Class method to make a raw sky WCS from boresight and detector.

Parameters:

boresightlsst.geom.SpherePoint

The ICRS boresight RA/Dec

orientationlsst.geom.Angle

The rotation angle of the focal plane on the sky.

detectorlsst.afw.cameraGeom.Detector

Where to get the camera geomtry from.

Returns:

skyWcsSkyWcs

Reversible mapping from pixel coordinates to sky coordinates.

makeUpdatedLocation(location: Location) → Location

Return a new Location updated with this formatter’s extension.

Parameters:

locationLocation

The location to update.

Returns:

updatedLocation

A new Location with a new file extension applied.

Raises:

NotImplementedError

Raised if there is no extension attribute associated with this formatter.

Notes

This method is available to all Formatters but might not be implemented by all formatters. It requires that a formatter set an extension attribute containing the file extension used when writing files. If extension is None the supplied file will not be updated. Not all formatters write files so this is not defined in the base class.

makeVisitInfo()

Construct a VisitInfo from metadata.

Returns:

visitInfoVisitInfo

Structured metadata about the observation.

makeWcs(visitInfo, detector)

Create a SkyWcs from information about the exposure.

If VisitInfo is not None, use it and the detector to create a SkyWcs, otherwise return the metadata-based SkyWcs (always created, so that the relevant metadata keywords are stripped).

Parameters:

visitInfoVisitInfo

The information about the telescope boresight and camera orientation angle for this exposure.

detectorDetector

The detector used to acquire this exposure.

Returns:

skyWcsSkyWcs

Reversible mapping from pixel coordinates to sky coordinates.

Raises:

InitialSkyWcsError

Raised if there is an error generating the SkyWcs, chained from the lower-level exception if available.

classmethod name() → str

Return the fully qualified name of the formatter.

Returns:

namestr

Fully-qualified name of formatter class.

predictPath() → str

Return the path that would be returned by write.

Does not write any data file.

Uses the FileDescriptor associated with the instance.

Returns:

pathstr

Path within datastore that would be associated with the location stored in this Formatter.

read(component=None)

Read a Dataset.

Parameters:

componentstr, optional

Component to read from the file. Only used if the StorageClass for reading differed from the StorageClass used to write the file.

Returns:

inMemoryDatasetobject

The requested Dataset.

readComponent(component)

Read a component dataset.

Parameters:

componentstr, optional

Component to read from the file.

Returns:

objcomponent-dependent

In-memory component object.

Raises:

KeyError

Raised if the requested component cannot be handled.

readFull()

Read the full dataset (while still accounting for parameters).

Returns:

objcomponent-dependent

In-memory component object.

readImage()

Read just the image component of the Exposure.

Returns:

imageImage

In-memory image component.

readMetadata()

Read all header metadata directly into a PropertyList.

Returns:

metadataPropertyList

Header metadata.

segregateParameters(parameters: dict[str, Any] | None = None) → tuple[dict, dict]

Segregate the supplied parameters.

This splits the parameters into those understood by the formatter and those not understood by the formatter.

Any unsupported parameters are assumed to be usable by associated assemblers.

Parameters:

parametersdict, optional

Parameters with values that have been supplied by the caller and which might be relevant for the formatter. If None parameters will be read from the registered FileDescriptor.

Returns:

supporteddict

Those parameters supported by this formatter.

unsupporteddict

Those parameters not supported by this formatter.

stripMetadata()

Remove metadata entries that are parsed into components.

toBytes(inMemoryDataset: Any) → bytes

Serialize the Dataset to bytes based on formatter.

Parameters:

inMemoryDatasetobject

The Python object to serialize.

Returns:

serializedDatasetbytes

Bytes representing the serialized dataset.

classmethod validateExtension(location: Location) → None

Check the extension of the provided location for compatibility.

Parameters:

locationLocation

Location from which to extract a file extension.

Raises:

NotImplementedError

Raised if file extensions are a concept not understood by this formatter.

ValueError

Raised if the formatter does not understand this extension.

Notes

This method is available to all Formatters but might not be implemented by all formatters. It requires that a formatter set an extension attribute containing the file extension used when writing files. If extension is None only the set of supported extensions will be examined.

classmethod validateWriteRecipes(recipes: Mapping[str, Any] | None) → Mapping[str, Any] | None

Validate supplied recipes for this formatter.

The recipes are supplemented with default values where appropriate.

Parameters:

recipesdict

Recipes to validate.

Returns:

validateddict

Validated recipes.

Raises:

RuntimeError

Raised if validation fails. The default implementation raises if any recipes are given.

write(inMemoryDataset)

Write a Python object to a file.

Parameters:

inMemoryDatasetobject

The Python object to store.

Returns:

pathstr

The URI where the primary file is stored.