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Fig. 3
Comparison between Epoch 2000 and Epoch 2011 in ITRF2000
Fig. 4
Comparison between Epoch 2000 in ITRF2000 and Epoch 2011 in ITRF2008
3.2 Test II: Comparison Between Epoch 2000 and 2011
in Different Reference Frames: ITRF2000
and ITRF2008, Respectively
Similar to Test I, one set of coordinates at epoch 1st January 2011 was compared
to the published set of coordinates of GDM2000 (2006), but in different reference
frames: ITRF2000 and ITRF2008, respectively. Figure
4
illustrates the differences
in terms of vector displacements between the two set of coordinates. It can be
shown that the position of the sites moved with an average magnitude of 24.7 cm
and orientation of 116.7 from epoch 2000, in ITRF2000 to epoch 2011 in
ITRF2008.
