Inheritance diagram for lsst.skymap.healpixSkyMap.HealpixSkyMap:

Public Member Functions
def	__init__ (self, config, version=0)

def	findTract (self, coord)

def	generateTract (self, index)

def	updateSha1 (self, sha1)

Static Public Attributes
	ConfigClass = HealpixSkyMapConfig

int	numAngles = 4

Detailed Description

HEALPix-based sky map pixelization.

We put a Tract at the position of each HEALPixel.


Parameters
----------
config : `lsst.skymap.BaseSkyMapConfig`
    The configuration for this SkyMap.
version : `int` or `tuple` of `int` (optional)
    Software version of this class, to retain compatibility with old
    instances.

Definition at line 86 of file healpixSkyMap.py.

Constructor & Destructor Documentation

◆ init()

def lsst.skymap.healpixSkyMap.HealpixSkyMap.__init__	(	self,
		config,
		version = `0`
	)

Reimplemented from lsst.skymap.cachingSkyMap.CachingSkyMap.

Definition at line 104 of file healpixSkyMap.py.

    def __init__(self, config, version=0):
        self._nside = 1 << config.log2NSide
        numTracts = healpy.nside2npix(self._nside)
        super(HealpixSkyMap, self).__init__(numTracts, config, version)
 

Member Function Documentation

◆ findTract()

def lsst.skymap.healpixSkyMap.HealpixSkyMap.findTract	(	self,
		coord
	)

Find the tract whose inner region includes the coord.

Parameters
----------
coord : `lsst.geom.SpherePoint`
    ICRS sky coordinate to search for.

Returns
-------
tractInfo : `TractInfo`
    Info for tract whose inner region includes the coord.

Reimplemented from lsst.skymap.baseSkyMap.BaseSkyMap.

Definition at line 109 of file healpixSkyMap.py.

    def findTract(self, coord):
        """Find the tract whose inner region includes the coord.
 
        Parameters
        ----------
        coord : `lsst.geom.SpherePoint`
            ICRS sky coordinate to search for.
 
        Returns
        -------
        tractInfo : `TractInfo`
            Info for tract whose inner region includes the coord.
        """
        theta, phi = coordToAng(coord)
        index = healpy.ang2pix(self._nside, theta, phi, nest=self.config.nest)
        return self[index]
 

◆ generateTract()

def lsst.skymap.healpixSkyMap.HealpixSkyMap.generateTract	(	self,
		index
	)

Generate TractInfo for the specified tract index.

Reimplemented from lsst.skymap.cachingSkyMap.CachingSkyMap.

Definition at line 126 of file healpixSkyMap.py.

    def generateTract(self, index):
        """Generate TractInfo for the specified tract index."""
        center = angToCoord(healpy.pix2ang(self._nside, index, nest=self.config.nest))
        wcs = self._wcsFactory.makeWcs(crPixPos=geom.Point2D(0, 0), crValCoord=center)
        return HealpixTractInfo(self._nside, index, self.config.nest, self._tractBuilder,
                                center, self.config.tractOverlap*geom.degrees,
                                wcs)
 

◆ updateSha1()

def lsst.skymap.healpixSkyMap.HealpixSkyMap.updateSha1	(	self,
		sha1
	)

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

Reimplemented from lsst.skymap.baseSkyMap.BaseSkyMap.

Definition at line 134 of file healpixSkyMap.py.

    def updateSha1(self, sha1):
        """Add subclass-specific state or configuration options to the SHA1."""
        sha1.update(struct.pack("<i?", self.config.log2NSide, self.config.nest))

Member Data Documentation

◆ ConfigClass

lsst.skymap.healpixSkyMap.HealpixSkyMap.ConfigClass = HealpixSkyMapConfig

static

Definition at line 100 of file healpixSkyMap.py.

◆ numAngles

int lsst.skymap.healpixSkyMap.HealpixSkyMap.numAngles = 4

static

Definition at line 102 of file healpixSkyMap.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/healpixSkyMap.py

Public Member Functions

Static Public Attributes