lsst.skymap.baseSkyMap.BaseSkyMap Class Reference

Inheritance diagram for lsst.skymap.baseSkyMap.BaseSkyMap:

Public Member Functions
def	__init__
def	findTract
def	findTractPatchList
def	__getitem__
def	__iter__
def	__len__

Public Attributes
	config

Static Public Attributes
	ConfigClass = BaseSkyMapConfig

Private Attributes
	_tractInfoList
	_wcsFactory

Detailed Description

A collection of overlapping Tracts that map part or all of the sky.

See TractInfo for more information.

BaseSkyMap is an abstract base class. Subclasses must do the following:
@li define __init__ and have it construct the TractInfo objects and put them in _tractInfoList
@li define __getstate__ and __setstate__ to allow pickling (the butler saves sky maps using pickle);
    see DodecaSkyMap for an example of how to do this. (Most of that code could be moved
    into this base class, but that would make it harder to handle older versions of pickle data.)

Definition at line 70 of file baseSkyMap.py.

Constructor & Destructor Documentation

def lsst.skymap.baseSkyMap.BaseSkyMap.__init__	(		self,
			config = None
	)

Construct a BaseSkyMap

@param[in] config: an instance of self.ConfigClass; if None the default config is used

Definition at line 82 of file baseSkyMap.py.

    def __init__(self, config=None):
        """Construct a BaseSkyMap
        
        @param[in] config: an instance of self.ConfigClass; if None the default config is used
        """
        if config is None:
            config = self.ConfigClass()
        config.freeze() # just to be sure, e.g. for pickling
        self.config = config
        self._tractInfoList = []
        self._wcsFactory = detail.WcsFactory(
            pixelScale = afwGeom.Angle(self.config.pixelScale, afwGeom.arcseconds),
            projection = self.config.projection,
            rotation = afwGeom.Angle(self.config.rotation, afwGeom.degrees),
        )