lsst.skymap.detail.utils Namespace Reference

Functions
def	coordFromVec (vec, defRA=None)

Function Documentation

coordFromVec()

def 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
    If vec too near a pole and defRA is None.

Definition at line 34 of file utils.py.

def 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
        If vec too near a pole and defRA is None.
    """
    if abs(vec[0]) < _TinyFloat and abs(vec[1]) < _TinyFloat:
        if defRA is None:
            raise RuntimeError("At pole and defRA==None")
        if vec[2] > 0:
            decDeg = 90.0
        else:
            decDeg = -90.0
        return geom.SpherePoint(defRA, decDeg*geom.degrees)
    return geom.SpherePoint(lsst.sphgeom.Vector3d(*vec))