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LSST Data Management Base Package
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Classes | Functions | Variables
lsst.skymap.detail.utils Namespace Reference

Classes

class  Index2D
 

Functions

 coordFromVec (vec, defRA=None)
 
 makeSkyPolygonFromBBox (bbox, wcs)
 

Variables

 _TinyFloat = numpy.finfo(float).tiny
 

Function Documentation

◆ coordFromVec()

lsst.skymap.detail.utils.coordFromVec ( vec,
defRA = None )
Convert an ICRS cartesian vector to an ICRS `lsst.geom.SpherePoint`.

Parameters
----------
vec : `list` of `float`
    An ICRS catesian vector.
defRA : `lsst.geom.Angle` or None
    The RA to use if the vector is too near a pole;
    ignored if not near a pole.

Raises
------
RuntimeError
    Raised if vec too near a pole and defRA is None.

Definition at line 34 of file utils.py.

34def coordFromVec(vec, defRA=None):
35 """Convert an ICRS cartesian vector to an ICRS `lsst.geom.SpherePoint`.
36
37 Parameters
38 ----------
39 vec : `list` of `float`
40 An ICRS catesian vector.
41 defRA : `lsst.geom.Angle` or None
42 The RA to use if the vector is too near a pole;
43 ignored if not near a pole.
44
45 Raises
46 ------
47 RuntimeError
48 Raised if vec too near a pole and defRA is None.
49 """
50 if abs(vec[0]) < _TinyFloat and abs(vec[1]) < _TinyFloat:
51 if defRA is None:
52 raise RuntimeError("At pole and defRA==None")
53 if vec[2] > 0:
54 decDeg = 90.0
55 else:
56 decDeg = -90.0
57 return geom.SpherePoint(defRA, decDeg*geom.degrees)
59
60
Point in an unspecified spherical coordinate system.
Definition SpherePoint.h:57
Vector3d is a vector in ℝ³ with components stored in double precision.
Definition Vector3d.h:51

◆ makeSkyPolygonFromBBox()

lsst.skymap.detail.utils.makeSkyPolygonFromBBox ( bbox,
wcs )
Make an on-sky polygon from a bbox and a SkyWcs.

Parameters
----------
bbox : `lsst.geom.Box2I` or `lsst.geom.Box2D`
    Bounding box of region, in pixel coordinates.
wcs : `lsst.afw.geom.SkyWcs`
    Celestial WCS.

Returns
-------
polygon : `lsst.sphgeom.ConvexPolygon`
    On-sky region

Definition at line 61 of file utils.py.

61def makeSkyPolygonFromBBox(bbox, wcs):
62 """Make an on-sky polygon from a bbox and a SkyWcs.
63
64 Parameters
65 ----------
66 bbox : `lsst.geom.Box2I` or `lsst.geom.Box2D`
67 Bounding box of region, in pixel coordinates.
68 wcs : `lsst.afw.geom.SkyWcs`
69 Celestial WCS.
70
71 Returns
72 -------
73 polygon : `lsst.sphgeom.ConvexPolygon`
74 On-sky region
75 """
76 pixelPoints = geom.Box2D(bbox).getCorners()
77 skyPoints = wcs.pixelToSky(pixelPoints)
78 return lsst.sphgeom.ConvexPolygon([sp.getVector() for sp in skyPoints])
79
80
A floating-point coordinate rectangle geometry.
Definition Box.h:413
ConvexPolygon is a closed convex polygon on the unit sphere.

Variable Documentation

◆ _TinyFloat

lsst.skymap.detail.utils._TinyFloat = numpy.finfo(float).tiny
protected

Definition at line 31 of file utils.py.