Affiliation:
1. Department of Applied Mathematics, University of Colorado at Boulder, Boulder, CO 80309, USA
Abstract
We construct near-optimal quadratures for the sphere that are invariant under the icosahedral rotation group. These quadratures integrate all (
N
+1)
2
linearly independent functions in a rotationally invariant subspace of maximal order and degree
N
. The nodes of these quadratures are nearly uniformly distributed, and the number of nodes is only marginally more than the optimal (
N
+1)
2
/3 nodes. Using these quadratures, we discretize the reproducing kernel on a rotationally invariant subspace to construct an analogue of Lagrange interpolation on the sphere. This representation uses function values at the quadrature nodes. In addition, the representation yields an expansion that uses a single function centred and mostly concentrated at nodes of the quadrature, thus providing a much better localization than spherical harmonic expansions. We show that this representation may be localized even further. We also describe two algorithms of complexity
for using these grids and representations. Finally, we note that our approach is also applicable to other discrete rotation groups.
Subject
General Physics and Astronomy,General Engineering,General Mathematics
Cited by
50 articles.
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