ected points
the residu-
lirection
RMS
ixel)
0.00
0.00
0.00
0.00
0.00
0.00
¢ for CE-2
k-projection
se of CE-1
e two linear
on the focal
by one area
lirection are
s of interior
luals versus
g images of
are listed in
cient b
B
22.97
23.42
22.15
;Jumn resid-
E-2
; in Table 6
iquation (8)
tion residu-
7 shows the
stion are re-
lirection
re and after
| as well as
emonstrated
tively larger
is indicates
ample, fit-
ult than fit-
ting a straight line.
10; :
column residusis
5
&
is
e
1000 2009 3000 4000 5000 6000 7060
column number
(a) Residuals and LSL for forward-looking image
>
columna residuais.
7000 2060 3006 4000 5000 6000 p
alarm number
(b) Residuals and LSL for backward-looking image
Figure 7. Back-projection residuals in column direction before
and after adjustment as well as the LQL (Take No.0580 orbit for
example)
DEM and DOM are generated using the corrected interior ori-
entation model and shown in Figure 8.
(b) DOM generated from CE-2 CCD images
Figure 8. Partial DEM and DOM generated using CE-1 CCD
images (take No.0581 orbit for example)
5 CONCLUSION AND DISCUSSION
In this research, we have developed the rigorous sensor models
of CE-1 and CE-2 CCD cameras to calculate ground points in
object space and back-project ground points into image space.
By analyzing back-projection residuals, we proposed two meth-
ods to refine the sensor models so that to reduce the residuals.
Experimental results indicate that the two methods, correcting
attitude angle bias and refining interior orientation model, are
very effective for CE-1 and CE-2 images respectively. Conse-
quently, the mapping products DEM and DOM have better pre-
cision after the sensor model refinement.
In the future, the two sensor model refinement methods will be
further improved and tested using more and larger images from
different orbits. Furthermore, a combined bundle adjustment in-
corporating these refinement methods will be developed to
reach best precisions of CE-1 and CE-2 images.
ACKNOWLEDGEMENTS
Funding of this research by National Key Basic Research and
Development Program of China (2012CB719902) and National
Natural Science Foundation of China (40871202, 41171355) is
acknowledged. We thank the Lunar and Deep Space Explora-
tion Science Applications Center of the National Astronomical
Observatories (NAOC) and Beijing Aerospace Control Center
for providing the CE-1 and CE-2 images and telemetry data.
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