DefineVisitsTask¶
- class lsst.obs.base.DefineVisitsTask(config: DefineVisitsConfig, *, butler: Butler, **kwargs: Any)¶
Bases:
Task
Driver Task for defining visits (and their spatial regions) in Gen3 Butler repositories.
- Parameters:
- config
DefineVisitsConfig
Configuration for the task.
- butler
Butler
Writeable butler instance. Will be used to read
camera
datasets and insert/sync dimension data.- **kwargs
Additional keyword arguments are forwarded to the
lsst.pipe.base.Task
constructor.
- config
Notes
Each instance of
DefineVisitsTask
reads from / writes to the same Butler. Each invocation ofDefineVisitsTask.run
processes an independent group of exposures into one or more new visits, all belonging to the same visit system and instrument.The actual work of grouping exposures and computing regions is delegated to pluggable subtasks (
GroupExposuresTask
andComputeVisitRegionsTask
), respectively. The defaults are to create one visit for every exposure, and to use exactly one (arbitrary) detector-level raw dataset’s WCS along with camera geometry to compute regions for all detectors, but the raw WCS is recomputed from theexposure
dimension record’s rotation angle and boresight rather than by loading theraw.wcs
dataset directly. Other implementations can be created and configured for instruments for which these choices are unsuitable (e.g. because visits and exposures are not one-to-one, or becauseraw.wcs
datasets for different detectors may not be consistent with camera geometry).Defining the same visit the same way multiple times (e.g. via multiple invocations of this task on the same exposures, with the same configuration) is safe, but it may be inefficient, as most of the work must be done before new visits can be compared to existing visits.
Methods Summary
Empty (clear) the metadata for this Task and all sub-Tasks.
Get metadata for all tasks.
Get the task name as a hierarchical name including parent task names.
getName
()Get the name of the task.
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
(dataIds, *[, collections, ...])Add visit definitions to the registry for the given exposures.
timer
(name[, logLevel])Context manager to log performance data for an arbitrary block of code.
Methods Documentation
- getFullMetadata() TaskMetadata ¶
Get metadata for all tasks.
- Returns:
- metadata
TaskMetadata
The keys are the full task name. Values are metadata for the top-level task and all subtasks, sub-subtasks, etc.
- metadata
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:
- 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”.
- fullName
- getName() str ¶
Get the name of the task.
- Returns:
- taskName
str
Name of the task.
- taskName
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:
- taskDict
dict
Dictionary containing full task name: task object for the top-level task and all subtasks, sub-subtasks, etc.
- taskDict
- classmethod makeField(doc: str) ConfigurableField ¶
Make a
lsst.pex.config.ConfigurableField
for this task.- Parameters:
- doc
str
Help text for the field.
- doc
- Returns:
- configurableField
lsst.pex.config.ConfigurableField
A
ConfigurableField
for this task.
- configurableField
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:
- 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
.
- name
Notes
The subtask must be defined by
Task.config.name
, an instance ofConfigurableField
orRegistryField
.
- run(dataIds: Iterable[DataCoordinate | Mapping[str, Any]], *, collections: Sequence[str] | str | None = None, update_records: bool = False, incremental: bool = False) None ¶
Add visit definitions to the registry for the given exposures.
- Parameters:
- dataIds
Iterable
[dict
orDataCoordinate
] Exposure-level data IDs. These must all correspond to the same instrument, and are expected to be on-sky science exposures.
- collections
Sequence
[str
] orstr
orNone
Collections to be searched for camera geometry, overriding
self.butler.collections.defaults
. Can be any of the types supported by thecollections
argument to butler construction.- update_records
bool
, optional If
True
(False
is default), update existingvisit
records andvisit_detector_region
records. THIS IS AN ADVANCED OPTION THAT SHOULD ONLY BE USED TO FIX REGIONS AND/OR METADATA THAT ARE KNOWN TO BE BAD, AND IT CANNOT BE USED TO REMOVE EXPOSURES OR DETECTORS FROM A VISIT.- incremental
bool
, optional If
True
indicate that exposures are being ingested incrementally and visit definition will be run on partial visits. This will allow thevisit
record to be updated if it already exists, but (unlikeupdate_records=True
) it will only update thevisit_detector_region
records if thevisit
record’s region changes. If there is any risk that files are being ingested incrementally it is critical that this parameter is set toTrue
and not to rely onupdate_records
.
- dataIds
- Raises:
- lsst.daf.butler.registry.ConflictingDefinitionError
Raised if a visit ID conflict is detected and the existing visit differs from the new one.