GetCoaddAsTemplateTask¶
-
class
lsst.ip.diffim.
GetCoaddAsTemplateTask
(config=None, name=None, parentTask=None, log=None)¶ Bases:
lsst.pipe.base.Task
Subtask to retrieve coadd for use as an image difference template.
This is the default getTemplate Task to be run as a subtask by
pipe.tasks.ImageDifferenceTask
. The main methods arerun()
andrunGen3()
.Notes
From the given skymap, the closest tract is selected; multiple tracts are not supported. The assembled template inherits the WCS of the selected skymap tract and the resolution of the template exposures. Overlapping box regions of the input template patches are pixel by pixel copied into the assembled template image. There is no warping or pixel resampling.
Pixels with no overlap of any available input patches are set to
nan
value andNO_DATA
flagged.Methods Summary
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. getCoaddDatasetName
()Return coadd name for given task config 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. getOverlapPatchList
(exposure, skyMap)Select the relevant tract and its patches that overlap with the science exposure. 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
(tractInfo, patchList, skyCorners, …[, …])Gen2 and gen3 shared code: determination of exposure dimensions and copying of pixels from overlapping patch regions. runDataRef
(exposure, sensorRef[, templateIdList])Gen2 task entry point. runQuantum
(exposure, butlerQC, skyMapRef, …)Gen3 task entry point. timer
(name[, logLevel])Context manager to log performance data for an arbitrary block of code. Methods Documentation
-
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.- schemacatalogs :
-
getCoaddDatasetName
()¶ Return coadd name for given task config
Returns: - CoaddDatasetName :
string
- TODO: This nearly duplicates a method in CoaddBaseTask (DM-11985)
- CoaddDatasetName :
-
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.- metadata :
-
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”.
- fullName :
-
getOverlapPatchList
(exposure, skyMap)¶ Select the relevant tract and its patches that overlap with the science exposure.
Parameters: - exposure :
lsst.afw.image.Exposure
The science exposure to define the sky region of the template coadd.
- skyMap :
lsst.skymap.BaseSkyMap
SkyMap object that corresponds to the template coadd.
Returns: - result :
tuple
of tractInfo
:lsst.skymap.TractInfo
The selected tract.
patchList
:list
oflsst.skymap.PatchInfo
List of all overlap patches of the selected tract.
skyCorners
:list
oflsst.geom.SpherePoint
Corners of the exposure in the sky in the order given by
lsst.geom.Box2D.getCorners
.
- exposure :
-
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.
- schemaCatalogs :
-
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.
- taskDict :
-
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")
- doc :
-
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 ofConfigurableField
orRegistryField
.- name :
-
run
(tractInfo, patchList, skyCorners, availableCoaddRefs, sensorRef=None, visitInfo=None)¶ Gen2 and gen3 shared code: determination of exposure dimensions and copying of pixels from overlapping patch regions.
Parameters: - skyMap :
lsst.skymap.BaseSkyMap
SkyMap object that corresponds to the template coadd.
- tractInfo :
lsst.skymap.TractInfo
The selected tract.
- patchList : iterable of
lsst.skymap.PatchInfo
Patches to consider for making the template exposure.
- skyCorners : list of
lsst.geom.SpherePoint
Sky corner coordinates to be covered by the template exposure.
- availableCoaddRefs :
dict
ofint
- `dict` (Gen2)
Dictionary of spatially relevant retrieved coadd patches, indexed by their sequential patch number. In Gen3 mode, .get() is called, in Gen2 mode, sensorRef.get(**coaddef) is called to retrieve the coadd.
- sensorRef :
lsst.daf.persistence.ButlerDataRef
, Gen2 only Butler data reference to get coadd data. Must be
None
for Gen3.- visitInfo :
lsst.afw.image.VisitInfo
, Gen2 only VisitInfo to make dcr model.
Returns: - templateExposure: `lsst.afw.image.ExposureF`
The created template exposure.
- skyMap :
-
runDataRef
(exposure, sensorRef, templateIdList=None)¶ Gen2 task entry point. Retrieve and mosaic a template coadd exposure that overlaps the science exposure.
Parameters: - exposure: `lsst.afw.image.Exposure`
an exposure for which to generate an overlapping template
- sensorRef : TYPE
a Butler data reference that can be used to obtain coadd data
- templateIdList : TYPE, optional
list of data ids, unused here, in the case of coadd template
Returns: - result :
lsst.pipe.base.Struct
exposure
:lsst.afw.image.ExposureF
a template coadd exposure assembled out of patches
sources
: None for this subtask
-
runQuantum
(exposure, butlerQC, skyMapRef, coaddExposureRefs)¶ Gen3 task entry point. Retrieve and mosaic a template coadd exposure that overlaps the science exposure.
Parameters: - exposure :
lsst.afw.image.Exposure
The science exposure to define the sky region of the template coadd.
- butlerQC :
lsst.pipe.base.ButlerQuantumContext
Butler like object that supports getting data by DatasetRef.
- skyMapRef :
lsst.daf.butler.DatasetRef
Reference to SkyMap object that corresponds to the template coadd.
- coaddExposureRefs : iterable of
lsst.daf.butler.DeferredDatasetRef
Iterable of references to the available template coadd patches.
Returns: - result :
lsst.pipe.base.Struct
exposure
:lsst.afw.image.ExposureF
a template coadd exposure assembled out of patches
sources
:None
for this subtask
- exposure :
-
timer
(name, logLevel=10000)¶ 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
andEnd
.- logLevel
A
lsst.log
level constant.
See also
timer.logInfo
Examples
Creating a timer context:
with self.timer("someCodeToTime"): pass # code to time
- name :
-