PRISM geometric validation and DSM generation status

PRISM carried at ALOS satellite is expected to generate worldwide topographic data in respects of its high resolution and stereoscopic observation. The software for generating Digital Surface Model was developed for the purpose of equipping the ground system which produces DSM semi-routinely in Earth Observation Research Center / Japan Aerospace Exploration Agency (EORC / JAXA). First, the geometric model stability and accuracy of PRISM sensor is presented with the experimental results of calibrations and validations. The geometric model of PRISM sensor consists of the static interior and dynamic exterior parameters. The interior parameters are the CCD unit camera parameters and are calibrated and validated by the preliminary experiments of self-calibrations with dense ground control points. The exterior parameters include the satellite orbit data measured by the onboard GPS receiver, the satellite attitude data measured by the onboard star tracker, gyro sensor units, and those alignment models. Those exterior parameters are calibrated and validated with adaptive orientation procedures. Next, the performance analysis of DSM generated with the PRISM geometric model is presented. The accuracy assessment results of generated DSM is presented from the comparison with high accuracy and high resolution reference DSM data sets derived from LiDAR and Aerial Photo matching at the various terrain futures.