MatchOptimisticBTask¶

class lsst.meas.astrom.MatchOptimisticBTask(**kwargs)¶

Bases: Task

Match sources to reference objects using the Optimistic Pattern Matcher B algorithm of Tabur 2007.

Methods Summary

`emptyMetadata`()	Empty (clear) the metadata for this Task and all sub-Tasks.
`filterStars`(refCat)	Extra filtering pass; subclass if desired.
`getFullMetadata`()	Get metadata for all tasks.
`getFullName`()	Get the task name as a hierarchical name including parent task names.
`getName`()	Get the name of the task.
`getTaskDict`()	Get a dictionary of all tasks as a shallow copy.
`makeField`(doc)	Make a `lsst.pex.config.ConfigurableField` for this task.
`makeSubtask`(name, **keyArgs)	Create a subtask as a new instance as the `name` attribute of this task.
`matchObjectsToSources`(refCat, sourceCat, ...)	Match sources to position reference stars.
`timer`(name[, logLevel])	Context manager to log performance data for an arbitrary block of code.

Methods Documentation

emptyMetadata() → None¶: Empty (clear) the metadata for this Task and all sub-Tasks.

filterStars(refCat)¶

Extra filtering pass; subclass if desired.

Parameters:

refCatlsst.afw.table.SimpleCatalog: Catalog of reference objects.

Returns:

trimmedRefCatlsst.afw.table.SimpleCatalog: Reference catalog with some filtering applied. Currently no filtering is applied.

getFullMetadata() → TaskMetadata¶

Get metadata for all tasks.

Returns:

metadataTaskMetadata: The keys are the full task name. Values are metadata for the top-level task and all subtasks, sub-subtasks, etc.

Notes

The returned metadata includes timing information (if @timer.timeMethod is used) and any metadata set by the task. The name of each item consists of the full task name with . replaced by :, followed by . and the name of the item, e.g.:

topLevelTaskName:subtaskName:subsubtaskName.itemName

using : in the full task name disambiguates the rare situation that a task has a subtask and a metadata item with the same name.

getFullName() → str¶

Get the task name as a hierarchical name including parent task names.

Returns:

fullNamestr

The full name consists of the name of the parent task and each subtask separated by periods. For example:

The full name of top-level task “top” is simply “top”.
The full name of subtask “sub” of top-level task “top” is “top.sub”.
The full name of subtask “sub2” of subtask “sub” of top-level task “top” is “top.sub.sub2”.

getName() → str¶

Get the name of the task.

Returns:

taskNamestr: Name of the task.

See also

getFullName

getTaskDict() → dict[str, weakref.ReferenceType[lsst.pipe.base.task.Task]]¶

Get a dictionary of all tasks as a shallow copy.

Returns:

taskDictdict: Dictionary containing full task name: task object for the top-level task and all subtasks, sub-subtasks, etc.

classmethod makeField(doc: str) → ConfigurableField¶

Make a lsst.pex.config.ConfigurableField for this task.

Parameters:

docstr: Help text for the field.

Returns:

configurableFieldlsst.pex.config.ConfigurableField: A ConfigurableField for this task.

Examples

Provides a convenient way to specify this task is a subtask of another task.

Here is an example of use:

class OtherTaskConfig(lsst.pex.config.Config):
    aSubtask = ATaskClass.makeField("brief description of task")

makeSubtask(name: str, **keyArgs: Any) → None¶

Create a subtask as a new instance as the name attribute of this task.

Parameters:

namestr

Brief name of the subtask.

**keyArgs

Extra keyword arguments used to construct the task. The following arguments are automatically provided and cannot be overridden:

config.
parentTask.

Notes

The subtask must be defined by Task.config.name, an instance of ConfigurableField or RegistryField.

matchObjectsToSources(refCat, sourceCat, wcs, sourceFluxField, refFluxField, match_tolerance=None)¶

Match sources to position reference stars.

Parameters:

refCatlsst.afw.table.SimpleCatalog: Reference catalog to match.
sourceCatlsst.afw.table.SourceCatalog: Catalog of sources found on an exposure. This should already be down-selected to “good”/”usable” sources in the calling Task.
wcslsst.afw.geom.SkyWcs: Current WCS of the exposure containing the sources.
sourceFluxFieldstr: Field of the sourceCat to use for flux
refFluxFieldstr: Field of the refCat to use for flux
match_tolerancelsst.meas.astrom.MatchTolerance: Object containing information from previous lsst.meas.astrom.AstrometryTask match/fit cycles for use in matching. If None is config defaults.

Returns:

matchResultlsst.pipe.base.Struct

Result struct with components

matches : List of matches with distance below the maximum match distance (list of lsst.afw.table.ReferenceMatch).
useableSourceCat : Catalog of sources matched and suited for WCS fitting (lsst.afw.table.SourceCatalog).
match_tolerance : MatchTolerance object updated from this match iteration (lsst.meas.astrom.MatchTolerance).

timer(name: str, logLevel: int = 10) → Iterator[None]¶

Context manager to log performance data for an arbitrary block of code.

Parameters:

namestr: Name of code being timed; data will be logged using item name: Start and End.
logLevel: A logging level constant.

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MatchOptimisticBTask¶