starepandas.STAREDataFrame.trixel_grings

STAREDataFrame.trixel_grings(vertices=None)

Returns corners of trixels as ECEF.

If vertices is set, the trixel corners are extracted from vertices (c.f. trixel_vertices()). If not, corners are generated from stare column

Parameters

verticestuple (vertices data structure)

If set, the centers are extracted from the vertices.

Returns

cornersnumpy array

ECEF norm vectors of great circles constraining the trixels. First dimension are the sids, second dimension the great circles, third dimension x/y/z

Examples

>>> sids = numpy.array([3458764513820540928])
>>> df = starepandas.STAREDataFrame(sids=sids)
>>> df.trixel_grings()
array([[[ 0.14644661,  0.85355339,  0.49999999],
        [-0.85355339, -0.14644661,  0.49999999],
        [ 0.49999999, -0.49999999,  0.70710679]]])