From digital map to spatial information multi-grid

Starting from the thinking about the representation of geo-spatial data in computer network, the challenge of grid computing environment to geo-spatial information science and technology is pointed in this paper. After review and summation of the achieved progress and existing problems of geo-spatial information systems in the past 20 years, the authors propose a new representation method for spatial data and spatial information ---- the spatial information multi-grid (SIMG), which can not only easily run under grid computing environment, but also properly consider the difference of natural and social characteristics in earth space as well as the different level of economical development in different area. The system structure, data representation, data storage and data access in SIMG are described with emphasis on key techniques. The data conversion and transferring between SIMG and conventional spatial databases are also discussed. The applicability of SIMG in global, national. provincial and local decision-making is briefly indicated.