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def | run (self, mapperResults, exposure, **kwargs) |
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Base class for any 'reduce' task that is to be
used as `ImageMapReduceConfig.reducer`.
Basic reduce operations are provided by the `run` method
of this class, to be selected by its config.
Definition at line 180 of file imageMapReduce.py.
◆ run()
def lsst.ip.diffim.imageMapReduce.ImageReducer.run |
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self, |
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mapperResults, |
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exposure, |
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** |
kwargs |
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) |
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Reduce a list of items produced by `ImageMapper`.
Either stitch the passed `mapperResults` list
together into a new Exposure (default) or pass it through
(if `self.config.reduceOperation` is 'none').
If `self.config.reduceOperation` is not 'none', then expect
that the `pipeBase.Struct`s in the `mapperResults` list
contain sub-exposures named 'subExposure', to be stitched back
into a single Exposure with the same dimensions, PSF, and mask
as the input `exposure`. Otherwise, the `mapperResults` list
is simply returned directly.
Parameters
----------
mapperResults : `list`
list of `lsst.pipe.base.Struct` returned by `ImageMapper.run`.
exposure : `lsst.afw.image.Exposure`
the original exposure which is cloned to use as the
basis for the resulting exposure (if
``self.config.mapper.reduceOperation`` is not 'None')
kwargs :
additional keyword arguments propagated from
`ImageMapReduceTask.run`.
Returns
-------
A `lsst.pipe.base.Struct` containing either an `lsst.afw.image.Exposure`
(named 'exposure') or a list (named 'result'),
depending on `config.reduceOperation`.
Notes
-----
1. This currently correctly handles overlapping sub-exposures.
For overlapping sub-exposures, use `config.reduceOperation='average'`.
2. This correctly handles varying PSFs, constructing the resulting
exposure's PSF via CoaddPsf (DM-9629).
Known issues
1. To be done: correct handling of masks (nearly there)
2. This logic currently makes *two* copies of the original exposure
(one here and one in `mapper.run()`). Possibly of concern
for large images on memory-constrained systems.
Definition at line 190 of file imageMapReduce.py.
◆ ConfigClass
The documentation for this class was generated from the following file: