lsst.skymap  13.0-5-g2a40766+22
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lsst.skymap.ringsSkyMap.RingsSkyMap Class Reference
Inheritance diagram for lsst.skymap.ringsSkyMap.RingsSkyMap:

Public Member Functions

def __init__
 
def getRingIndices
 
def generateTract
 
def findTract
 
def findAllTracts
 
def findTractPatchList
 

Static Public Attributes

 ConfigClass = RingsSkyMapConfig
 

Detailed Description

Rings sky map pixelization.

We divide the sphere into N rings of Declination, plus the two polar
caps, which sets the size of the individual tracts.  The rings are
divided in RA into an integral number of tracts of this size; this
division is made at the Declination closest to zero so as to ensure
full overlap.

Definition at line 42 of file ringsSkyMap.py.

Constructor & Destructor Documentation

def lsst.skymap.ringsSkyMap.RingsSkyMap.__init__ (   self,
  config,
  version = 0 
)
Constructor

@param[in] config: an instance of self.ConfigClass; if None the default config is used
@param[in] version: software version of this class, to retain compatibility with old instances

Definition at line 54 of file ringsSkyMap.py.

Member Function Documentation

def lsst.skymap.ringsSkyMap.RingsSkyMap.findAllTracts (   self,
  coord 
)
Find all tracts which include the specified coord.

@param[in] coord: sky coordinate (afwCoord.Coord)
@return List of TractInfo of tracts which include the specified coord

@note
- This routine will be more efficient if coord is ICRS.

Definition at line 146 of file ringsSkyMap.py.

def lsst.skymap.ringsSkyMap.RingsSkyMap.findTract (   self,
  coord 
)
Find the tract whose center is nearest the specified coord.

@param[in] coord: sky coordinate (afwCoord.Coord)
@return TractInfo of tract whose center is nearest the specified coord

@warning:
- if tracts do not cover the whole sky then the returned tract may not include the coord

@note
- This routine will be more efficient if coord is ICRS.
- If coord is equidistant between multiple sky tract centers then one is arbitrarily chosen.
- The default implementation is not very efficient; subclasses may wish to override.

Definition at line 110 of file ringsSkyMap.py.

def lsst.skymap.ringsSkyMap.RingsSkyMap.findTractPatchList (   self,
  coordList 
)
Find tracts and patches that overlap a region

@param[in] coordList: list of sky coordinates (afwCoord.Coord)
@return list of (TractInfo, list of PatchInfo) for tracts and patches that contain,
    or may contain, the specified region. The list will be empty if there is no overlap.

@warning this uses a naive algorithm that may find some tracts and patches that do not overlap
    the region (especially if the region is not a rectangle aligned along patch x,y).

Definition at line 196 of file ringsSkyMap.py.

def lsst.skymap.ringsSkyMap.RingsSkyMap.generateTract (   self,
  index 
)
Generate the TractInfo for this index

Definition at line 93 of file ringsSkyMap.py.

def lsst.skymap.ringsSkyMap.RingsSkyMap.getRingIndices (   self,
  index 
)
Calculate ring indices given a numerical index of a tract

The ring indices are the ring number and the tract number within
the ring.

The ring number is -1 for the south polar cap and increases to the
north.  The north polar cap has ring number = numRings.  The tract
number is zero for either of the polar caps.

Definition at line 72 of file ringsSkyMap.py.

Member Data Documentation

lsst.skymap.ringsSkyMap.RingsSkyMap.ConfigClass = RingsSkyMapConfig
static

Definition at line 51 of file ringsSkyMap.py.


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