lsst.pipe.drivers.constructCalibs.SkyTask Class Reference

Inheritance diagram for lsst.pipe.drivers.constructCalibs.SkyTask:

Public Member Functions
def	__init__ (self, *args, **kwargs)
def	scatterProcess (self, pool, ccdIdLists)
	Scatter the processing among the nodes. More...
def	measureBackground (self, cache, dataId)
	Measure background model for CCD. More...
def	processSingleBackground (self, dataRef)
	Process a single CCD for the background. More...
def	processSingle (self, dataRef, backgrounds, scales)
def	combine (self, cache, struct, outputId)
	Combine multiple background models of a particular CCD and write the output. More...

Static Public Attributes
	ConfigClass = SkyConfig
string	calibName = "sky"

Detailed Description

Task for sky frame construction

The sky frame is a (relatively) small-scale background
model, the response of the camera to the sky.

To construct, we first remove a large-scale background (e.g., caused
by moonlight) which may vary from image to image. Then we construct a
model of the sky, which is essentially a binned version of the image
(important configuration parameters: sky.background.[xy]BinSize).
It is these models which are coadded to yield the sky frame.

Definition at line 1182 of file constructCalibs.py.

Constructor & Destructor Documentation

__init__()

def lsst.pipe.drivers.constructCalibs.SkyTask.__init__	(		self,
		*	args,
		**	kwargs
	)

Constructor

Reimplemented from lsst.pipe.drivers.constructCalibs.CalibTask.

Definition at line 1198 of file constructCalibs.py.

Member Function Documentation

combine()

def lsst.pipe.drivers.constructCalibs.SkyTask.combine	(		self,
			cache,
			struct,
			outputId
	)

Combine multiple background models of a particular CCD and write the output.

    Only the slave nodes execute this method.

    @param cache  Process pool cache
    @param struct  Parameters for the combination, which has the following components:
        * ccdName     Name tuple for CCD
        * ccdIdList   List of data identifiers for combination
    @param outputId    Data identifier for combined image (exposure part only)
    @return binned calib image

Reimplemented from lsst.pipe.drivers.constructCalibs.CalibTask.

Definition at line 1316 of file constructCalibs.py.

measureBackground()

def lsst.pipe.drivers.constructCalibs.SkyTask.measureBackground	(		self,
			cache,
			dataId
	)

Measure background model for CCD.

    This method is executed by the slaves.

    The background models for all CCDs in an exposure will be
    combined to form a full focal-plane background model.

    @param cache  Process pool cache
    @param dataId  Data identifier
    @return Bcakground model

Definition at line 1246 of file constructCalibs.py.

processSingle()

def lsst.pipe.drivers.constructCalibs.SkyTask.processSingle	(		self,
			dataRef,
			backgrounds,
			scales
	)

Process a single CCD, specified by a data reference

We subtract the appropriate focal plane background model,
divide by the appropriate scale and measure the background.

Only slave nodes execute this method.

@param dataRef  Data reference for single CCD
@param backgrounds  Background model for each visit
@param scales  Scales for each visit
@return Processed exposure

Reimplemented from lsst.pipe.drivers.constructCalibs.CalibTask.

Definition at line 1288 of file constructCalibs.py.

processSingleBackground()

def lsst.pipe.drivers.constructCalibs.SkyTask.processSingleBackground	(		self,
			dataRef
	)

Process a single CCD for the background.

    This method is executed by the slaves.

    Because we're interested in the background, we detect and mask astrophysical
    sources, and pixels above the noise level.

    @param dataRef  Data reference for CCD.
    @return processed exposure

Definition at line 1269 of file constructCalibs.py.

scatterProcess()

def lsst.pipe.drivers.constructCalibs.SkyTask.scatterProcess	(		self,
			pool,
			ccdIdLists
	)

Scatter the processing among the nodes.

    Only the master node executes this method, assigning work to the
    slaves.

    We measure and subtract off a large-scale background model across
    all CCDs, which requires a scatter/gather. Then we process the
    individual CCDs, subtracting the large-scale background model and
    the residual background model measured. These residuals will be
    combined for the sky frame.

    @param pool  Process pool
    @param ccdIdLists  Dict of data identifier lists for each CCD name
    @return Dict of lists of returned data for each CCD name

Reimplemented from lsst.pipe.drivers.constructCalibs.CalibTask.

Definition at line 1203 of file constructCalibs.py.

Member Data Documentation

calibName

string lsst.pipe.drivers.constructCalibs.SkyTask.calibName = "sky"

static

Definition at line 1196 of file constructCalibs.py.

ConfigClass

lsst.pipe.drivers.constructCalibs.SkyTask.ConfigClass = SkyConfig

static

Definition at line 1194 of file constructCalibs.py.

---

The documentation for this class was generated from the following file:

• python/lsst/pipe/drivers/constructCalibs.py