Since the launch of ADEOS satellite, it has been pointed out that the accuracy of the attitude data is very suspicious. Under such conditions, the estimation of satellite behavior was carried out utilizing RIS data, OCTS images, GCPs, etc. This paper describes the method of the exterior orientation which treats the distance from the satellite to the geocenter, the longitude of the ascending node, orbit inclination and the argument of latitude as orientation parameters. Then the examinations concerning the satellite motion and attitude based on the method are introduced.
Three dimensional position data of ground objects watched on a landsliding area can effectively and safely be obtained by aerial photogrammetry. These data acquired by several flights of different time are used to the least square algorithm that is constructed for presumption of the geometric shape of underground slide surface. This paper newly introduced two techniques into the analytic procedure. They are 1) estimation of the reliability of tracking points and boundary conditions, 2) connection condition of many different shapes of sliding group. Effects of these techniques are verified by numerical examples applied to the actual landslide areas having complicated shape of underground slide surface.
In rugged terrain, a digital number of satellite data is highly correlated with direct solar irradiation, which is propotional to the cosine of solar incident angle. The direct solar irradiation can be calculated with high geometrical accuracy by using a digital elevation model and the solar position. In this paper, we propose to use the calculated direct solar irradiation to determine ground control points (GCPs) for precise geometrical correction of the satellite imagery. The proposed method is applied to an actual Landsat/TM image to show its effectiveness.