but with the same number of control points, the check points
precision of stereo positioning for the opposite looking
direction images is higher than the precision of same looking
direction images. There is a close relationship between the
stereo positioning accuracy and base-height ratio, and with the
base-height ratio is greater, the positioning accuracy is higher
and more stability.
The control points in test are photogrammetric for
SPOTHRS/HRG optical images, relative to the TerraSAR-X
image resolution that the precision is still a bit low, which
would affect the accuracy and reliability of the orientation
parameters solution. In the condition with higher precision
measured GCPs, TerraSAR-X stereo positioning accuracy in
theoretical will be better than test results in paper.
4 CONCLUSION
The R-Cp geometric imaging model which take exterior
orientation elements as orientation parameters could be used as
the SAR image 3D positioning, and this method can directly
adopt the combined adjustment methods developed by optical
images, which show that the R-Cp geometric imaging model
has certain advantages in the side-looking radar digital
photography process, the rigorous stereo positioning model for
satellite TerraSAR-X images that can satisfy the mapping
accuracy in mountainous terrain. The surveyed area tests
showed that there was a big relationship between the
positioning accuracy and the number of ground control points
and distribution, the coordinate measurement accuracy, and the
size of the forward intersection angle of the ground point.
In some steepness mountain area that snow covered all the year
round and no one could arrive, it is difficult to only use optical
images to map, but the swath of SPOTSHRS images is much
larger than the TerraSAR-X high resolution image, this resulted
that use sparse ground points in
SPOTSHRS/HRG achieve many three-dimensional
triangulation encryption points at gaps of snow covering for
large area. We can take advantage of these encryption points for
known control
could
the TerraSAR-X image stereo positioning and mapping, and
decrease field work for control points surveying. This method
1:50,000
topographic mapping of China western snow-capped mountains
region, also the model built in this paper has been used in
1:50000 mapping project for China western area.
provides an effective choice for complete the
5. ACKNOWLEDGEMENTS
This paper is supported by National Natural Science Foundation
of China( No. 41071237 ), the National High Technology
Research and Development program of China (863 program)
(No. 2011AA120401, No. 201 1AA 120402).
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