Extension of the ABC-Procrustes algorithm for 3D affine coordinate transformation

Details Extension of the ABC-Procrustes algorithm for 3D affine coordinate transformation Extension of the ABC-Procrustes algorithm for 3D affine coordinate transformation

Nov 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010ep%26s...62..857p&link_type=abstract

Earth, Planets and Space, Volume 62, Issue 11, p. 857-862.

Statistics

Computation

Scientific paper

The Procrustes method is a very effective method for determining the Helmert's datum transformation parameters since it requires neither initial starting values nor iteration. Due to these attractive attributes, the ABC-Procrustes algorithm is extended to solve the 3D affine transformation problem where scale factors are different in the 3 principal directions X,Y,Z. In this study, it is shown that such a direct extension is restricted to cases of mild anisotropy in scaling. For strong anisotropy, however, the procedure fails. The PZ-method is proposed as an extension of the ABC algorithm for this special case. The procedures are applied to determine transformation parameters for; (i) transforming the Australian Geodetic Datum (AGD 84) to the Geocentric Datum Australia (GDA 94), i.e., mild anisotropy and (ii) synthetic data for strong anisotropy. The results indicate that the PZ-algorithm leads to a local multivariate minimization as opposed to the ABC-algorithm, thus requiring slightly longer computational time. However, the ABC-method is found to be useful for computing proper initial values for the PZ-method, thereby increasing its efficiency.

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