In Dataset B, the geometric model of ZY3_Tianjin was built
by using the calibration parameters obtained on May 2012;
the direct positioning accuracy was better than 15 m, and
the accuracy of the interior orientation parameters was bet-
ter than 0.3 pixels. Based on the side angles of ZY3_Tianjin
and 02C_Tianjin, the height error of 90 m-
SRTM
could also be
neglected according to a derivation similar to that used for
Dataset A. Thus, ZY3_Tianjin was selected as the reference
for the geometric cross-calibration of ZY02C. Then, the 1:2
000 scale
DOM
and
DEM
in Tianjin (Figure 3b) were taken as
control data to check the calibration accuracy.
(a)
(b)
Figure 2. Deviation in the intersection of the conjugate points caused by the height error.
(a)
(b)
Figure 3. High-accuracy control data: (a) 1:2 000 scale digital ortho-photo and elevation models of Henan
calibration field, and (b) 1:2 000 scale digital orthophoto and elevation models of Tianjin.
PHOTOGRAMMETRIC ENGINEERING & REMOTE SENSING
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