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Figure2. Distribution of generated virtual GCPs
Figure 3. the residual vectors of planimetrie coordinates.
Figure 4. the residual vectors of 3D object coordinates.
As the Figure 3 indicates and according to Table 3, the X and Y
residuals are quite small implying accurate plannimeric fitting
potential of the 3D affine model. However, the height residuals
do not indicate high fitting accuracy. This shows that as far as
the height values are concerned, there is a non-linearity in the
image data that the linear terms of the 3D affine cannot take it
into account. However, another reason for the lower height
fitting accuracy may be the measurement errors during the
homologous points identification and measurement stage.
CONCLUDING REMARKS
The overall results achieved in this study further supports the
conclusions arrived by other researchers as regards the
applicability of the 3D affine transformation as a replacement
model for the more sophisticated RFM. This statement is true
under the proviso that the strip length does not exceed the size
of a high resolution satellite frame.
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