WANG De-yuan, ZHANG Xiao-lin, MA Qiang etc. Procrustes method in coordinate transformation on multi-station of large scale measurement[J]. Editorial Office of Optics and Precision Engineering, 2014,22(4): 949-955
WANG De-yuan, ZHANG Xiao-lin, MA Qiang etc. Procrustes method in coordinate transformation on multi-station of large scale measurement[J]. Editorial Office of Optics and Precision Engineering, 2014,22(4): 949-955 DOI: 10.3788/OPE.20142204.0949.
Procrustes method in coordinate transformation on multi-station of large scale measurement
A 7 parameter Procrustes method with scale factors was proposed and a coordinate conversion model was established to transform coordinate data for a multi-station in large scale coordinate measurement.First
according to the coordinate transformation principle of large-size measuring instrument
the 7 parameter non-linear model in coordinate transformation was established
the Procrustes method and its applicability for coordinate transformation were analyzed and the transformation process of the center method was introduced. Then
the working steps of the 7 parameter Procrustes algorithm were listed. Finally
this method was used to test and verify the measuring data from a Faro laser tracker. The obtained results were compared with those from the laser tracker supporting software in a transfer station and center method and also the conversion parameters were used to transform the coordinates for both ends of a scale bar with a given length. The results show that the maximum error of the 7 parameters method in three axes of
x
y
z
are 24.5
μ
m
42.5
μ
m and 32.8
μ
m and the mean error of this method is 17.1
μ
m
better than that of the supporting software and the center method. Moreover
the error range of the scale bar's length is 36
μ
m in transformed coordinates of this method. The method is also suitable for other coordinate transform instruments to implement data matching.
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references
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