MeasureApCorrTask¶

class lsst.meas.algorithms.MeasureApCorrTask(schema, namesToCorrect=None, **kwargs)¶

Bases: Task

Task to measure aperture correction.

For every name to correct, a new field apcorr_{name}_used will be added, and will be logged in self.toCorrect.

Parameters:

schemalsst.afw.table.Schema: Schema for the input table; will be modified in place to add apcorr_{name}_used fields.
namesToCorrectlist [str], optional: List of names to correct. If None then the set of registered fields in lsst.meas.base.getApCorrNameSet() will be used.
**kwargsdict: Additional kwargs to pass to lsst.pipe.base.Task.__init__()

Raises:

MeasureApCorrError if any of the names to correct fails and is
not in the config.allowFailure list.

Methods Summary

`emptyMetadata`()	Empty (clear) the metadata for this Task and all sub-Tasks.
`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.
`run`(exposure, catalog)	Measure aperture correction
`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.

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: Get the full name of the task.

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.

run(exposure, catalog)¶

Measure aperture correction

Parameters:

exposurelsst.afw.image.Exposure: Exposure aperture corrections are being measured on. The bounding box is retrieved from it, and it is passed to the sourceSelector. The output aperture correction map is not added to the exposure; this is left to the caller.
cataloglsst.afw.table.SourceCatalog: SourceCatalog containing measurements to be used to compute aperture corrections.

Returns:

Structlsst.pipe.base.Struct

Contains the following:

apCorrMap: aperture correction map (lsst.afw.image.ApCorrMap) that contains two entries for each flux field: - flux field (e.g. base_PsfFlux_instFlux): 2d model - flux sigma field (e.g. base_PsfFlux_instFluxErr): 2d model of error

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.
logLevelint: A logging level constant.

Navigation

MeasureApCorrTask¶