lsst.skymap.equatSkyMap.EquatSkyMap Class Reference

Inheritance diagram for lsst.skymap.equatSkyMap.EquatSkyMap:

Public Member Functions
def	__init__ (self, config=None)
def	__getstate__ (self)
def	__setstate__ (self, stateDict)
def	getVersion (self)
def	updateSha1 (self, sha1)

Static Public Attributes
	ConfigClass = EquatSkyMapConfig

Detailed Description

Equatorial sky map pixelization, e.g. for SDSS stripe 82 image data.

EquatSkyMap represents an equatorial band of sky divided along declination
into overlapping tracts.

Parameters
----------
config : `lsst.skymap.BaseSkyMapConfig` (optional)
    The configuration for this SkyMap; if None use the default config.

Definition at line 50 of file equatSkyMap.py.

Constructor & Destructor Documentation

__init__()

def lsst.skymap.equatSkyMap.EquatSkyMap.__init__	(		self,
			config = None
	)

Reimplemented from lsst.skymap.baseSkyMap.BaseSkyMap.

Definition at line 64 of file equatSkyMap.py.

    def __init__(self, config=None):
        BaseSkyMap.__init__(self, config)
 
        decRange = tuple(geom.Angle(dr, geom.degrees) for dr in self.config.decRange)
        midDec = (decRange[0] + decRange[1]) / 2.0
        tractWidthRA = geom.Angle(360.0 / self.config.numTracts, geom.degrees)
        tractOverlap = geom.Angle(self.config.tractOverlap, geom.degrees)
 
        for id in range(self.config.numTracts):
            begRA = tractWidthRA * id
            endRA = begRA + tractWidthRA
            vertexCoordList = (
                geom.SpherePoint(begRA, decRange[0]),
                geom.SpherePoint(endRA, decRange[0]),
                geom.SpherePoint(endRA, decRange[1]),
                geom.SpherePoint(begRA, decRange[1]),
            )
 
            midRA = begRA + tractWidthRA / 2.0
            ctrCoord = geom.SpherePoint(midRA, midDec)
 
            # CRVal must have Dec=0 for symmetry about the equator
            crValCoord = geom.SpherePoint(midRA, geom.Angle(0.0))
 
            # make initial WCS; don't worry about crPixPos because TractInfo will shift it as required
            wcs = self._wcsFactory.makeWcs(crPixPos=geom.Point2D(0, 0), crValCoord=crValCoord)
 
            self._tractInfoList.append(TractInfo(
                id=id,
                tractBuilder=self._tractBuilder,
                ctrCoord=ctrCoord,
                vertexCoordList=vertexCoordList,
                tractOverlap=tractOverlap,
                wcs=wcs,
            ))
 

Member Function Documentation

__getstate__()

def lsst.skymap.equatSkyMap.EquatSkyMap.__getstate__

(

self

)

Support pickle.

Returns
-------
stateDict : `dict`
    a dict containing:
    - version: a pair of ints
    - config: the config

Definition at line 100 of file equatSkyMap.py.

    def __getstate__(self):
        """Support pickle.
 
        Returns
        -------
        stateDict : `dict`
            a dict containing:
            - version: a pair of ints
            - config: the config
        """
        return dict(
            version=self._version,
            config=self.config,
        )
 

__setstate__()

def lsst.skymap.equatSkyMap.EquatSkyMap.__setstate__	(		self,
			stateDict
	)

Support unpickle

Parameters
----------
stateDict : `dict`
    a dict containing:
    - version: a pair of ints
    - config: the config

Definition at line 115 of file equatSkyMap.py.

    def __setstate__(self, stateDict):
        """Support unpickle
 
        Parameters
        ----------
        stateDict : `dict`
            a dict containing:
            - version: a pair of ints
            - config: the config
        """
        version = stateDict["version"]
        if version >= (2, 0):
            raise RuntimeError("Version = %s >= (2,0); cannot unpickle" % (version,))
        self.__init__(stateDict["config"])
 

getVersion()

def lsst.skymap.equatSkyMap.EquatSkyMap.getVersion

(

self

)

Return version (e.g. for pickle).

Returns
-------
result : `tuple` of `int`
    Version as a pair of integers.

Definition at line 130 of file equatSkyMap.py.

    def getVersion(self):
        """Return version (e.g. for pickle).
 
        Returns
        -------
        result : `tuple` of `int`
            Version as a pair of integers.
        """
        return self._version
 

updateSha1()

def lsst.skymap.equatSkyMap.EquatSkyMap.updateSha1	(		self,
			sha1
	)

Add subclass-specific state or configuration options to the SHA1.

Reimplemented from lsst.skymap.baseSkyMap.BaseSkyMap.

Definition at line 140 of file equatSkyMap.py.

    def updateSha1(self, sha1):
        """Add subclass-specific state or configuration options to the SHA1."""
        sha1.update(struct.pack("<i2d", self.config.numTracts, *self.config.decRange))

Member Data Documentation

ConfigClass

lsst.skymap.equatSkyMap.EquatSkyMap.ConfigClass = EquatSkyMapConfig

static

Definition at line 61 of file equatSkyMap.py.

---

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

• /j/snowflake/release/lsstsw/stack/lsst-scipipe-4.0.1/Linux64/skymap/gdb4cecd868+6f279b5b48/python/lsst/skymap/equatSkyMap.py