LSSTApplications  20.0.0
LSSTDataManagementBasePackage
discreteSkyMap.py
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2 # LSST Data Management System
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22 
23 __all__ = ["DiscreteSkyMap"]
24 
25 import struct
26 
27 from lsst.pex.config import ListField
28 import lsst.geom as geom
29 from .cachingSkyMap import CachingSkyMap
30 from .tractInfo import ExplicitTractInfo
31 
32 
33 class DiscreteSkyMapConfig(CachingSkyMap.ConfigClass):
34  """Configuration for the DiscreteSkyMap"""
35 
36  raList = ListField(dtype=float, default=[], doc="Right Ascensions of tracts (ICRS, degrees)")
37  decList = ListField(dtype=float, default=[], doc="Declinations of tracts (ICRS, degrees)")
38  radiusList = ListField(dtype=float, default=[], doc="Radii of tracts (degrees)")
39 
40  def validate(self):
41  super(DiscreteSkyMapConfig, self).validate()
42  if len(self.radiusList) != len(self.raList):
43  raise ValueError("Number of radii (%d) and RAs (%d) do not match" %
44  (len(self.radiusList), len(self.raList)))
45  if len(self.radiusList) != len(self.decList):
46  raise ValueError("Number of radii (%d) and Decs (%d) do not match" %
47  (len(self.radiusList), len(self.decList)))
48 
49 
51  """Discrete sky map pixelization.
52 
53  We put a square Tract at each of the nominated coordinates.
54 
55  Parameters
56  ----------
57  config : `lsst.skyMap.BaseSkyMapConfig`
58  The configuration for this SkyMap; if None use the default config.
59  version : `int` or `tuple` of `int` (optional)
60  Software version of this class, to retain compatibility with old
61  instances.
62  """
63  ConfigClass = DiscreteSkyMapConfig
64  _version = (1, 0) # for pickle
65 
66  def __init__(self, config, version=0):
67  numTracts = len(config.radiusList)
68  super(DiscreteSkyMap, self).__init__(numTracts, config, version)
69 
70  def generateTract(self, index):
71  """Generate TractInfo for the specified tract index."""
72  center = geom.SpherePoint(self.config.raList[index], self.config.decList[index], geom.degrees)
73  radius = self.config.radiusList[index]
74  wcs = self._wcsFactory.makeWcs(crPixPos=geom.Point2D(0, 0), crValCoord=center)
75  return ExplicitTractInfo(index, self.config.patchInnerDimensions, self.config.patchBorder, center,
76  radius*geom.degrees, self.config.tractOverlap*geom.degrees, wcs)
77 
78  def updateSha1(self, sha1):
79  """Add subclass-specific state or configuration options to the SHA1."""
80  fmt = "<{}d".format(len(self.config.radiusList))
81  sha1.update(struct.pack(fmt, *self.config.raList))
82  sha1.update(struct.pack(fmt, *self.config.decList))
83  sha1.update(struct.pack(fmt, *self.config.radiusList))
lsst.skymap.baseSkyMap.BaseSkyMap.config
config
Definition: baseSkyMap.py:107
lsst.skymap.discreteSkyMap.DiscreteSkyMapConfig.raList
raList
Definition: discreteSkyMap.py:36
lsst.skymap.discreteSkyMap.DiscreteSkyMapConfig.radiusList
radiusList
Definition: discreteSkyMap.py:38
pex.config.history.format
def format(config, name=None, writeSourceLine=True, prefix="", verbose=False)
Definition: history.py:174
lsst.skymap.discreteSkyMap.DiscreteSkyMapConfig.validate
def validate(self)
Definition: discreteSkyMap.py:40
lsst.skymap.discreteSkyMap.DiscreteSkyMap.__init__
def __init__(self, config, version=0)
Definition: discreteSkyMap.py:66
lsst.skymap.baseSkyMap.BaseSkyMap._wcsFactory
_wcsFactory
Definition: baseSkyMap.py:109
lsst.skymap.discreteSkyMap.DiscreteSkyMapConfig
Definition: discreteSkyMap.py:33
lsst.skymap.discreteSkyMap.DiscreteSkyMap.updateSha1
def updateSha1(self, sha1)
Definition: discreteSkyMap.py:78
lsst.skymap.cachingSkyMap.CachingSkyMap
Definition: cachingSkyMap.py:28
lsst.skymap.discreteSkyMap.DiscreteSkyMap
Definition: discreteSkyMap.py:50
lsst::geom
Definition: geomOperators.dox:4
lsst::meas::astrom::makeWcs
std::shared_ptr< afw::geom::SkyWcs > makeWcs(SipForwardTransform const &sipForward, SipReverseTransform const &sipReverse, geom::SpherePoint const &skyOrigin)
Create a new TAN SIP Wcs from a pair of SIP transforms and the sky origin.
Definition: SipTransform.cc:148
lsst.skymap.tractInfo.ExplicitTractInfo
Definition: tractInfo.py:418
lsst.skymap.discreteSkyMap.DiscreteSkyMapConfig.decList
decList
Definition: discreteSkyMap.py:37
lsst::geom::Point< double, 2 >
lsst::geom::SpherePoint
Point in an unspecified spherical coordinate system.
Definition: SpherePoint.h:57
lsst.skymap.discreteSkyMap.DiscreteSkyMap.generateTract
def generateTract(self, index)
Definition: discreteSkyMap.py:70