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LSST Data Management Base Package
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discreteSkyMap.py
Go to the documentation of this file.
2# LSST Data Management System
3# Copyright 2008, 2009, 2010, 2012 LSST Corporation.
4#
5# This product includes software developed by the
6# LSST Project (http://www.lsst.org/).
7#
8# This program is free software: you can redistribute it and/or modify
9# it under the terms of the GNU General Public License as published by
10# the Free Software Foundation, either version 3 of the License, or
11# (at your option) any later version.
12#
13# This program is distributed in the hope that it will be useful,
14# but WITHOUT ANY WARRANTY; without even the implied warranty of
15# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16# GNU General Public License for more details.
17#
18# You should have received a copy of the LSST License Statement and
19# the GNU General Public License along with this program. If not,
20# see <http://www.lsstcorp.org/LegalNotices/>.
21#
22
23__all__ = ["DiscreteSkyMapConfig", "DiscreteSkyMap"]
24
25import struct
26
27from lsst.pex.config import ListField
28import lsst.geom as geom
29from .cachingSkyMap import CachingSkyMap
30from .tractInfo import ExplicitTractInfo
31
32
33class DiscreteSkyMapConfig(CachingSkyMap.ConfigClass):
34 """Configuration for the DiscreteSkyMap"""
35
36 raList = ListField(dtype=float, default=[], doc="Right Ascensions of tract centers (ICRS, degrees)")
37 decList = ListField(dtype=float, default=[], doc="Declinations of tract centers (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._tractBuilder, 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))
Point in an unspecified spherical coordinate system.
Definition SpherePoint.h:57