ASTER Program is a joint program carried out by MITI/ERSDAC and NASA to contribute the extensive understanding of the Earth as a system through NASA's EOS Program. ASTER, the successor to the Japanese Earth Resources Satellite-1 (JERS-1) launched in 1992, is a high-resolution multi-spectral imaging sensor covering from visible to thermal infrared region. ASTER will be launched in 1999 as a one of the sensors of the NASA's EOS AM-1, the first satellite of the EOS program. Data acquisition is executed based on the schedule established using scheduler taking the priority of the acquisition request into account The algorithms for science data products are developed by ASTER Science Team composed of Japanese and U.S. scientists. ERSDAC coordinates the public solicitation of researchers to use ASTER data, called ASTER Announcement of Opportunity (ASTER AO). Any and all researchers, scientists, and research organizations are welcome to submit research proposals for non-profit and peaceful purposes to use ASTER data. They will be privileged to obtain a certain amount of ASTER data and to submit the data acquisition requests (DAR). ASTER data will be distributed to all users on a nondiscriminatory basis for peaceful purposes in consistent with national laws and regulations.