LSST Applications  21.0.0-147-g0e635eb1+1acddb5be5,22.0.0+052faf71bd,22.0.0+1ea9a8b2b2,22.0.0+6312710a6c,22.0.0+729191ecac,22.0.0+7589c3a021,22.0.0+9f079a9461,22.0.1-1-g7d6de66+b8044ec9de,22.0.1-1-g87000a6+536b1ee016,22.0.1-1-g8e32f31+6312710a6c,22.0.1-10-gd060f87+016f7cdc03,22.0.1-12-g9c3108e+df145f6f68,22.0.1-16-g314fa6d+c825727ab8,22.0.1-19-g93a5c75+d23f2fb6d8,22.0.1-19-gb93eaa13+aab3ef7709,22.0.1-2-g8ef0a89+b8044ec9de,22.0.1-2-g92698f7+9f079a9461,22.0.1-2-ga9b0f51+052faf71bd,22.0.1-2-gac51dbf+052faf71bd,22.0.1-2-gb66926d+6312710a6c,22.0.1-2-gcb770ba+09e3807989,22.0.1-20-g32debb5+b8044ec9de,22.0.1-23-gc2439a9a+fb0756638e,22.0.1-3-g496fd5d+09117f784f,22.0.1-3-g59f966b+1e6ba2c031,22.0.1-3-g849a1b8+f8b568069f,22.0.1-3-gaaec9c0+c5c846a8b1,22.0.1-32-g5ddfab5d3+60ce4897b0,22.0.1-4-g037fbe1+64e601228d,22.0.1-4-g8623105+b8044ec9de,22.0.1-5-g096abc9+d18c45d440,22.0.1-5-g15c806e+57f5c03693,22.0.1-7-gba73697+57f5c03693,master-g6e05de7fdc+c1283a92b8,master-g72cdda8301+729191ecac,w.2021.39
LSST Data Management Base Package
SpherePoint.h
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1 /*
2  * Developed for the LSST Data Management System.
3  * This product includes software developed by the LSST Project
4  * (https://www.lsst.org).
5  * See the COPYRIGHT file at the top-level directory of this distribution
6  * for details of code ownership.
7  *
8  * This program is free software: you can redistribute it and/or modify
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15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16  * GNU General Public License for more details.
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19  * along with this program. If not, see <https://www.gnu.org/licenses/>.
20  */
21 
22 #ifndef LSST_GEOM_SPHEREPOINT_H_
23 #define LSST_GEOM_SPHEREPOINT_H_
24 
25 #include <cmath>
26 #include <ostream>
27 #include <utility>
28 
30 #include "lsst/sphgeom/Vector3d.h"
31 #include "lsst/geom/Angle.h"
32 #include "lsst/geom/Point.h"
33 
34 namespace lsst {
35 namespace geom {
36 
58 public:
72  SpherePoint(Angle const& longitude, Angle const& latitude);
73 
88  SpherePoint(double longitude, double latitude, AngleUnit units);
89 
105  explicit SpherePoint(sphgeom::Vector3d const& vector);
106 
114  SpherePoint(sphgeom::LonLat const& lonLat) noexcept;
115 
117  SpherePoint() noexcept;
118 
126  SpherePoint(SpherePoint const& other) noexcept;
127 
134  SpherePoint(SpherePoint&& other) noexcept;
135 
136  ~SpherePoint() noexcept;
137 
150  SpherePoint& operator=(SpherePoint const& other) noexcept;
151 
158  SpherePoint& operator=(SpherePoint&& other) noexcept;
159 
165  operator sphgeom::LonLat() const noexcept;
166 
167  /*
168  * Accessors
169  */
170 
178  Angle getLongitude() const noexcept { return _longitude * radians; };
179 
181  Angle getRa() const noexcept { return _longitude * radians; };
182 
190  Angle getLatitude() const noexcept { return _latitude * radians; };
191 
193  Angle getDec() const noexcept { return _latitude * radians; };
194 
202  Point2D getPosition(AngleUnit unit) const noexcept;
203 
211  sphgeom::UnitVector3d getVector() const noexcept;
212 
227  Angle operator[](size_t index) const;
228 
237  bool atPole() const noexcept {
238  // Unit tests indicate we don't need to worry about epsilon-errors, in that
239  // Objects constructed from lat=90*degrees, <0,0,1>, etc. all have atPole() = true.
240  return fabs(_latitude) >= HALFPI;
241  }
242 
252  bool isFinite() const noexcept;
253 
254  /*
255  * Comparisons between points
256  */
257 
278  bool operator==(SpherePoint const& other) const noexcept;
279 
286  bool operator!=(SpherePoint const& other) const noexcept;
287 
289  std::size_t hash_value() const noexcept;
290 
310  Angle bearingTo(SpherePoint const& other) const;
311 
321  Angle separation(SpherePoint const& other) const noexcept;
322 
323  /*
324  * Transformations of points
325  */
326 
338  SpherePoint rotated(SpherePoint const& axis, Angle const& amount) const noexcept;
339 
356  SpherePoint offset(Angle const& bearing, Angle const& amount) const;
357 
366  std::pair<Angle, Angle> getTangentPlaneOffset(SpherePoint const& other) const;
367 
368 private:
369  double _longitude; // radians
370  double _latitude; // radians
371 
373  void _set(sphgeom::UnitVector3d const& unitVector);
374 };
375 
383 SpherePoint averageSpherePoint(std::vector<SpherePoint> const& coords);
384 
385 /*
386  * Object-level display
387  */
388 
409 std::ostream& operator<<(std::ostream& os, SpherePoint const& point);
410 
411 } // namespace geom
412 } // namespace lsst
413 
414 namespace std {
415 template <>
419  size_t operator()(argument_type const& x) const noexcept { return x.hash_value(); }
420 };
421 } // namespace std
422 
423 #endif /* LSST_GEOM_SPHEREPOINT_H_ */
double x
std::ostream * os
Definition: Schema.cc:557
This file declares a class for representing unit vectors in ℝ³.
This file declares a class for representing vectors in ℝ³.
table::Key< lsst::geom::Angle > longitude
Definition: VisitInfo.cc:206
table::Key< lsst::geom::Angle > latitude
Definition: VisitInfo.cc:205
A class representing an angle.
Definition: Angle.h:127
A class used to convert scalar POD types such as double to Angle.
Definition: Angle.h:70
Point in an unspecified spherical coordinate system.
Definition: SpherePoint.h:57
std::pair< Angle, Angle > getTangentPlaneOffset(SpherePoint const &other) const
Get the offset from a tangent plane centered at this point to another point.
Definition: SpherePoint.cc:214
SpherePoint offset(Angle const &bearing, Angle const &amount) const
Return a point offset from this one along a great circle.
Definition: SpherePoint.cc:185
SpherePoint(SpherePoint const &other) noexcept
Create a copy of a SpherePoint.
bool isFinite() const noexcept
true if this point is a well-defined position.
Definition: SpherePoint.cc:144
Point2D getPosition(AngleUnit unit) const noexcept
Return longitude, latitude as a Point2D object.
Definition: SpherePoint.cc:129
Angle bearingTo(SpherePoint const &other) const
Orientation at this point of the great circle arc to another point.
Definition: SpherePoint.cc:159
bool atPole() const noexcept
true if this point is either coordinate pole.
Definition: SpherePoint.h:237
Angle separation(SpherePoint const &other) const noexcept
Angular distance between two points.
Definition: SpherePoint.cc:173
SpherePoint(SpherePoint &&other) noexcept
Create a copy of a SpherePoint.
sphgeom::UnitVector3d getVector() const noexcept
A unit vector representation of this point.
Definition: SpherePoint.cc:124
SpherePoint() noexcept
Construct a SpherePoint with "nan" for longitude and latitude.
Definition: SpherePoint.cc:108
Angle getLatitude() const noexcept
The latitude of this point.
Definition: SpherePoint.h:190
Angle getLongitude() const noexcept
The longitude of this point.
Definition: SpherePoint.h:178
SpherePoint rotated(SpherePoint const &axis, Angle const &amount) const noexcept
Return a point rotated from this one around an axis.
Definition: SpherePoint.cc:178
Angle getDec() const noexcept
Synonym for getLatitude.
Definition: SpherePoint.h:193
std::size_t hash_value() const noexcept
Return a hash of this object.
Definition: SpherePoint.cc:154
Angle getRa() const noexcept
Synonym for getLongitude.
Definition: SpherePoint.h:181
LonLat represents a spherical coordinate (longitude/latitude angle) pair.
Definition: LonLat.h:48
UnitVector3d is a unit vector in ℝ³ with components stored in double precision.
Definition: UnitVector3d.h:55
Vector3d is a vector in ℝ³ with components stored in double precision.
Definition: Vector3d.h:44
class[[deprecated("Removed with no replacement (but see lsst::afw::image::TransmissionCurve). Will be " "removed after v22.")]] FilterProperty final
Describe the properties of a Filter (e.g.
Definition: Filter.h:53
lsst::geom::SpherePoint SpherePoint
Definition: misc.h:34
SpherePoint averageSpherePoint(std::vector< SpherePoint > const &coords)
Return the average of a list of coordinates.
Definition: SpherePoint.cc:235
constexpr double HALFPI
Definition: Angle.h:41
constexpr AngleUnit radians
constant with units of radians
Definition: Angle.h:108
A base class for image defects.
STL namespace.
size_t operator()(argument_type const &x) const noexcept
Definition: SpherePoint.h:419