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Toshiaki Hashimoto 
The method described in chapter 3 was examined utilizing the simulated data. It was proved that the system worked 
well. Concerning the GCP collection, sufficient number of GCPs could be obtained with good accuracy. But the 
accuracy of exterior orientation using the obtained GCPs was about 5 pixels, which was not precise. This was owing to 
that the scan geometry of GLI is very different from that of OCTS and the simulated image data could not reflect the 
actual condition of the GLI image. However, it is expected through the experiences of the system for AVHRR and 
OCTS that the geometric accuracy with less than one pixel for the GLI will be achieved. 
5 CONCLUSIONS 
The system for the precise geometric correction of ADEOS-II/GLI was developed. The argorithm of the geomtric 
correction is based on the principle of collinearity condition. The experiment using the simulated data from OCTS data - 
proved that the system worked well. To make the system applicable to actual GLI data, the following investigations 
have to be conducted. 
(1) NASDA has the plan to make some simulated data from the MODIS data. The check should be carried out how the 
system will work using the simulated data. 
(2) The sensor alignments are not considered in the current system. They will be applied to the system just after the 
ground measurement of them. Furthermore, if the change of the sensor alignment owing to the launch will be 
recognized during the initial check out period, they will be corrected using a huge number of GCPs from many 
images. 
(3) The spectral channels of GLI are different from those of OCTS. It should be investigated, using the simulated data 
from the MODIS data and the actual GLI data, which channel of GLI is suitable for obtaining coastal image data at 
the stage of GCP collection. The product of the GLI includes the land/ocean flag data which is also generated from 
the GMT. If they can be used as the coastal image patches, the process of the GCP collection will be easier to make 
the patches. The suitability of the land/ocean flag data for the GCP collection should be investigated using the 
actual GLI data. 
REFERNENCES 
Hashimoto, H., et al, 1992. Fast and Accurate Geometric Correction of NOAA AVHRR Imagery, Archives of 17th 
ISPRS, pp. 445-450. 
Hashimoto, H., 1997. Precise Geometric Correction of ADEOS/OCTS Imagery, Journal of JSPRS, Vol.36, No.5, 
pp.42-51. 
Hashimoto, H., 1998. The Estimation of Motion and Attitude of ADEOS Satellite Utilizing the Principle of Exterior 
Orientation, Journal of JSPRS, Vol.37, No.6, pp.4-13. 
Hashimoto, H., 1999, Correction of OCTS Sensor Alignment, Proc. of 20th ACRS, pp.807-811. 
NOAA/NESDIS, NOAA KLM Users Guide : Appendix I, on http://www2.ncdc.noaa.gov/docs/klm/html/i/app-i.htm 
Patt, F. S., er al, 1994. Exact closed-form geolocation algorithm for Earth survey sensors, Int'] Journal of Remote 
Sensing, Vol.15, No.18, pp.3719-3734. 
Rosborough, G. W., et al, 1994. Precise AVHRR Image Navigation, IEEE Trans. On Geoscience and Remote Sensing, 
Vol.32, No.3, pp.644-657. 
Wessel, P., GMT — The generic Mapping Tools, on http://www.soest.hawaii.edu/emt 
  
International Archives of Photogrammetry and Remote Sensing. Vol. XXXIII, Part B1. Amsterdam 2000. 147