1∶250000 soil and terrain spatial and attribute digital databases and its landform indexes system

Soil and terrain spatial and attribute digital databases(SOTER) at a scale of 1∶250000 was studied according to the theory and methodology of SOTER database. The research focused on exploring suitable landform indexes for this scale. The classification of elevation, slope and relief index was produced. Based on elevation, slope and relief index, landform of research area were calculated and delineated, they are medium slope hill, low slope mountain and mesa, valley floor, medium slope mountain, gentle slope floor and alluvial-diluvial plain. The construction of SOTER makes it possible that historical soil and land survey data, which had been set aside without usage, was transformed into information system. These data can serve for land evaluation, land management and land protection. The theory and methodology of SOTER was also extended by this research, this showed an example of the application of SOTER methodology to small scale.