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The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences. Vol. XXXVII. Part B4. Beijing 2008
ASTER and ETM image is not good as SPOT5 and IKONOS
image. It shows that high precision control points are in favour
in improving the accuracy of geometric correction, but for
different resolution images, the improving level is different; also
shows that it is necessary to use high precision control points
for geometric correction of images for high spatial resolution.
3. RESULTS AND CONCLUSIONS
By statistical calculation the result is following:
(1) the precision of ASTER, ETM, SPOT5 and IKONOS four
kinds of remote sensing are respectively 25 meters, 28 meters,
21 meters and 6.7 meters through accurate geometric correction
by calculating control points in topographic map.
(2) the precision of ASTER, ETM, SPOT5 and IKONOS four
kinds of remote sensing are respectively 20 meters, 26 meters,
24 meters and 10.1 meters through accurate geometric
correction by surveying control points in the wild.
(3) the precision of ASTER, ETM, SPOT5 and IKONOS four
kinds of remote sensing are respectively 18 meters, 22 meters,
13 meters and 4.8 meters through accurate geometric correction
by GPS (technique of RTK ) or other high accurate survey
instruments.
By comparative analysis we obtain the following conclusions:
(1) the correction accuracy of ASTER and ETM images using
points surveyed by portable GPS is equivalent in comparison to
the correction accuracy of ASTER and ETM images by
calculating points on topographic map, and slightly higher than
the latter. It shows that surveying points by portable GPS can be
instead of calculating on 1:50000 scale topographic map. It is
suggested that control points needed in geometric correction can
be obtained by topographic maps or by portable GPS for
ASTER and ETM images.
(2) the correction accuracy of SPOT5 and IKONOS images
using points surveyed by portable GPS is lower than the
correction accuracy of ASTER and ETM images by calculating
points in topographic map. So it is best not to use surveying
control points by portable GPS to correct SPOT5, IKONOS
images.
(3) Using the points surveyed by GPS (technique of RTK ), the
correction accuracy of the four images has been enhanced in
comparison to using the points calculated in topographic map.
Especially, the accuracy of SPOT and IKONOS images raises
more. But it is not significant to improve the correction
accuracy of ASTER and ETM images under improving the
accuracy of the control points. 4
(4) It shows that improving the accuracy of control points can
increase the correction accuracy correspondingly. In order to get
higher accuracy for the high spatial resolution remote sensing
images , such as SPOT5 and IKONOS images, it is necessary
to use higher precision control points . It is suggested that
control points needed in geometric correction can be obtained
by topographic maps or by GPS (technique of RTK ) for SPOT5
and IKONOS images .
ACKNOWLEDGEMENTS
This work was supported by Aero Geophysical Survey And Remote
Sensing CenteriNO: 1212010611 ).The author would like to thank
Chen Jianping,Tian Sufang and Gao Hui for their suggestion
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