Kyoichi Ito
Special Assistant to President
Head of Business Development
Remote Sensing Technology Center (RESTEC)
Japan

Abstract
World 3D Topographic Map

The topographic data is one of fundamental layers in the field of geographic information systems. It is essential not only for creating maps or ortho-photos but also for various applications e.g., infrastructure design, disaster monitoring, environmental monitoring, and natural resources survey. Panchromatic Remote-sensing Instrument for Stereo Mapping (PRISM), one of onboard sensors carried by Advanced Land Observing Satellite (ALOS), was designed to generate worldwide topographic data with its optical stereoscopic observation. The sensor consists of three independent panchromatic radiometers for viewing forward, nadir, and backward in 2.5m ground resolution producing a triplet stereoscopic image along its track of 35km swath. The sensor had observed huge amount of optical stereo images all over the world during the mission life of the satellite from 2006 through 2011. We started a new mission which generates the global digital surface model (DSM), one of the topographic data, by utilizing abt. 3M image archives . The data is processed in unprecedented 5m grid spacing utilizing the original triplet stereo images in 2.5m resolution. The target accuracy of the product was set to 5m (rms) in vertical and also 5m (rms) in horizontal. In the data processing the single scene-DSMs are processed first, and then they are mosaicked onto 1?x1? tiles of geodetic latitude/longitude coordinates as final data products. We will introduce our product with on up-to-date results of the quality assessments for the DSM data products as well as some algorithm updates for the processing software.