ATBD User's Guide Reference Guide	ATBD(ASTER Algorithm Theoretical Basis Documents)provides explanation of algorithm and theoretical basis for processing ASTER standard product etc. This ATBD is available in PDF edition only. ATBD ASTER User's Guide provides users with various information on ASTER data utilization. This User's Guide consists of three volumes and the third volume carries description of each product. ASTER User's Guide ASTER Reference Guide is a guidebook for the those who uses ASTER data for the first time.This Reference Guide is available in PDF edition only. ASTER Reference Guide