DirectMatchTask

class lsst.meas.astrom.DirectMatchTask(butler=None, refObjLoader=None, **kwargs)

Bases: lsst.pipe.base.Task

Simple, brute force matching of a source catalog to a reference catalog.

Parameters:
butler : lsst.daf.persistence.Butler

Data butler containing the relevant reference catalog data.

refObjLoader : lsst.meas.algorithms.LoadReferenceObjectsTask or None

For loading reference objects.

**kwargs

Other keyword arguments required for instantiating a Task (such as config).

Methods Summary

calculateCircle(catalog) Calculate a circle enclosing the catalog.
emptyMetadata() Empty (clear) the metadata for this Task and all sub-Tasks.
getAllSchemaCatalogs() Get schema catalogs for all tasks in the hierarchy, combining the results into a single dict.
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.
getSchemaCatalogs() Get the schemas generated by this 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(catalog[, filterName, epoch]) Load reference objects and match to them.
setRefObjLoader(refObjLoader) Set the reference object loader for the task.
timer(name[, logLevel]) Context manager to log performance data for an arbitrary block of code.

Methods Documentation

calculateCircle(catalog)

Calculate a circle enclosing the catalog.

Parameters:
catalog : lsst.afw.table.SourceCatalog

Catalog to encircle.

Returns:
result : lsst.pipe.base.Struct

Result struct with components:

center

ICRS center coordinate (lsst.afw.geom.SpherePoint).

radius

Radius of the circle (lsst.geom.Angle).

emptyMetadata()

Empty (clear) the metadata for this Task and all sub-Tasks.

getAllSchemaCatalogs()

Get schema catalogs for all tasks in the hierarchy, combining the results into a single dict.

Returns:
schemacatalogs : dict

Keys are butler dataset type, values are a empty catalog (an instance of the appropriate lsst.afw.table Catalog type) for all tasks in the hierarchy, from the top-level task down through all subtasks.

Notes

This method may be called on any task in the hierarchy; it will return the same answer, regardless.

The default implementation should always suffice. If your subtask uses schemas the override Task.getSchemaCatalogs, not this method.

getFullMetadata()

Get metadata for all tasks.

Returns:
metadata : lsst.daf.base.PropertySet

The PropertySet 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()

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

Returns:
fullName : str

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()

Get the name of the task.

Returns:
taskName : str

Name of the task.

See also

getFullName

getSchemaCatalogs()

Get the schemas generated by this task.

Returns:
schemaCatalogs : dict

Keys are butler dataset type, values are an empty catalog (an instance of the appropriate lsst.afw.table Catalog type) for this task.

See also

Task.getAllSchemaCatalogs

Notes

Warning

Subclasses that use schemas must override this method. The default implementation returns an empty dict.

This method may be called at any time after the Task is constructed, which means that all task schemas should be computed at construction time, not when data is actually processed. This reflects the philosophy that the schema should not depend on the data.

Returning catalogs rather than just schemas allows us to save e.g. slots for SourceCatalog as well.

getTaskDict()

Get a dictionary of all tasks as a shallow copy.

Returns:
taskDict : dict

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

classmethod makeField(doc)

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

Parameters:
doc : str

Help text for the field.

Returns:
configurableField : lsst.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, **keyArgs)

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

Parameters:
name : str

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(catalog, filterName=None, epoch=None)

Load reference objects and match to them.

Parameters:
catalog : lsst.afw.table.SourceCatalog

Catalog to match.

filterName : str

Name of filter loading fluxes.

epoch : astropy.time.Time or None

Epoch to which to correct proper motion and parallax, or None to not apply such corrections.

Returns:
result : lsst.pipe.base.Struct

Result struct with components:

matches

Matched sources with associated reference (lsst.afw.table.SourceMatchVector).

matchMeta

Match metadata (lsst.meas.astrom.MatchMetadata).

setRefObjLoader(refObjLoader)

Set the reference object loader for the task.

Parameters:
refObjLoader

An instance of a reference object loader, either a lsst.meas.algorithms.LoadReferenceObjectsTask task or a lsst.meas.algorithms.ReferenceObjectLoader instance. A task can be used as a subtask and is generally used in gen2 middleware. The class is designed to be used with gen3 middleware and is initialized outside the normal task framework.

timer(name, logLevel=10)

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

Parameters:
name : str

Name of code being timed; data will be logged using item name: Start and End.

logLevel

A logging level constant.

See also

timer.logInfo

Examples

Creating a timer context:

with self.timer("someCodeToTime"):
    pass  # code to time