International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Vol XXXV, Part Bl. Istanbul 2004
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Figure 11. Along-path GCP over 91 sec with RSP 67 - 69
very difficult to access outside of these areas. However, from
the result of Figure 6, the Kalgoorlie and Esperance areas will
be observed simultaneously with the forward-looking and nadir-
looking radiometers, and the nadir-looking and backward-
looking radiometers. Evaluating the alignments of CCDs and
radiometers, including thermal effects, will be both important
and useful. Ideally, additional GCP areas should be prepared to
evaluate the geometric accuracy of as many PRISM images as
possible.
4. CONCLUSION
In this study, we introduced the current plans for calibrating and
validating PRISM, which is carried aboard ALOS, including the
strategies of preparing GCPs, which is very important for
evaluating geometric accuracy and for validating generated
DEMs. These tasks are very important because the results
contribute directly to the quality of the products, especially
evaluation of the absolute geometric accuracy for PRISM. The
accuracy evaluation of the prepared GCPs is also important for
this purpose. Furthermore, the tools for matching GCPs with
PRISM images, for geometric calibration as well as for
radiometric calibration, will be developed until the launch of
the ALOS.
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Figure 12. Along-path GCP in southwest Australia
ACKNOWLEDGEMENTS
The authors wish to thank the colleagues of the Geographical
Survey Institute (GSI) of Japan, the Australian Center for
Remote Sensing (ACRES) of Geoscience Australia, and the
Remote Sensing Technology Center (RESTEC) of Japan for
their cooperation is establishing GCPs.
REFERENCES
Ichitsubo, D., Y. Osawa, T. Hamazaki and A. Matsumoto, 2003.
Development Status for the Advanced Land Observing Satellite.
International Archives of Photogrammetry, Remote Sensing and
Spatial Information Science, Vol. XXXIV, Part. 7/W4.
Matsumoto, A., T. Hamazaki, Y. Osawa and D. Ichitsubo, 2003.
Development Status of ALOS's Sensors. /nternational Archives
of Photogrammetry, Remote Sensing and Spatial Information
Science, Vol. XXXIV, Part. 7/W 4.
Iwata, T., Y. Osawa, and T. Kawahara, 2002. Precision Pointing
Management for the Advanced Land Observing Satellite
(ALOS). The 23rd International Symposium Space Technology
and Science, ISTS2002-d-56.
Tadono, T., M. Shimada, M. Watanabe, T. Hashimoto and M.
Matsuoka, 2003. Preliminary Study for Evaluating Geometric
Accuracy of ALOS/PRISM. Proceedings of IEEE International
Geoscience and Remote Sensing Symposium, CD-ROM.
Takaku, J., N. Futamura, A. Goto, T. lijima, T. Tadono, M.
Matsuoka, M. Shimada and R. Shibasaki, 2003. High resolution
DEM Generation from ALOS PRISM Data, -Triplet Image
Algorithm Evaluation-. Proceedings of IEEE International
Geoscience and Remote Sensing Symposium, CD-ROM.
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