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LSST Data Management Base Package
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Public Member Functions | Static Public Attributes | Static Protected Attributes | List of all members
lsst.skymap.equatSkyMap.EquatSkyMap Class Reference
Inheritance diagram for lsst.skymap.equatSkyMap.EquatSkyMap:
lsst.skymap.baseSkyMap.BaseSkyMap

Public Member Functions

 __init__ (self, config=None)
 
 __getstate__ (self)
 
 __setstate__ (self, stateDict)
 
 getVersion (self)
 
 updateSha1 (self, sha1)
 

Static Public Attributes

 ConfigClass = EquatSkyMapConfig
 

Static Protected Attributes

tuple _version = (1, 0)
 

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__()

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

Reimplemented from lsst.skymap.baseSkyMap.BaseSkyMap.

Definition at line 64 of file equatSkyMap.py.

64 def __init__(self, config=None):
65 BaseSkyMap.__init__(self, config)
66
67 decRange = tuple(geom.Angle(dr, geom.degrees) for dr in self.config.decRange)
68 midDec = (decRange[0] + decRange[1]) / 2.0
69 tractWidthRA = geom.Angle(360.0 / self.config.numTracts, geom.degrees)
70 tractOverlap = geom.Angle(self.config.tractOverlap, geom.degrees)
71
72 for id in range(self.config.numTracts):
73 begRA = tractWidthRA * id
74 endRA = begRA + tractWidthRA
75 vertexCoordList = (
76 geom.SpherePoint(begRA, decRange[0]),
77 geom.SpherePoint(endRA, decRange[0]),
78 geom.SpherePoint(endRA, decRange[1]),
79 geom.SpherePoint(begRA, decRange[1]),
80 )
81
82 midRA = begRA + tractWidthRA / 2.0
83 ctrCoord = geom.SpherePoint(midRA, midDec)
84
85 # CRVal must have Dec=0 for symmetry about the equator
86 crValCoord = geom.SpherePoint(midRA, geom.Angle(0.0))
87
88 # Make initial WCS; don't worry about crPixPos because TractInfo
89 # will shift it as required.
90 wcs = self._wcsFactory.makeWcs(crPixPos=geom.Point2D(0, 0), crValCoord=crValCoord)
91
92 self._tractInfoList.append(TractInfo(
93 id=id,
94 tractBuilder=self._tractBuilder,
95 ctrCoord=ctrCoord,
96 vertexCoordList=vertexCoordList,
97 tractOverlap=tractOverlap,
98 wcs=wcs,
99 ))
100
A class representing an angle.
Definition Angle.h:128
Point in an unspecified spherical coordinate system.
Definition SpherePoint.h:57

Member Function Documentation

◆ __getstate__()

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 101 of file equatSkyMap.py.

101 def __getstate__(self):
102 """Support pickle.
103
104 Returns
105 -------
106 stateDict : `dict`
107 a dict containing:
108 - version: a pair of ints
109 - config: the config
110 """
111 return dict(
112 version=self._version,
113 config=self.config,
114 )
115

◆ __setstate__()

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 116 of file equatSkyMap.py.

116 def __setstate__(self, stateDict):
117 """Support unpickle
118
119 Parameters
120 ----------
121 stateDict : `dict`
122 a dict containing:
123 - version: a pair of ints
124 - config: the config
125 """
126 version = stateDict["version"]
127 if version >= (2, 0):
128 raise RuntimeError("Version = %s >= (2,0); cannot unpickle" % (version,))
129 self.__init__(stateDict["config"])
130

◆ getVersion()

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 131 of file equatSkyMap.py.

131 def getVersion(self):
132 """Return version (e.g. for pickle).
133
134 Returns
135 -------
136 result : `tuple` of `int`
137 Version as a pair of integers.
138 """
139 return self._version
140

◆ updateSha1()

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 141 of file equatSkyMap.py.

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

Member Data Documentation

◆ _version

tuple lsst.skymap.equatSkyMap.EquatSkyMap._version = (1, 0)
staticprotected

Definition at line 62 of file equatSkyMap.py.

◆ 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: