Basic Platform of Land and Resources Information System Based on Data Center and Its Technical Questions

China will pay more attention to building the national land and resources information system in next few years. The foundation of this system is to integrate information. However, there are three problems in integrating land and resources information: (1) data short of share among different GIS; (2) data do not integrate among diverse types; (3) data do not transfer through data centers in various levels. The first can be solved by adding a middle layer to convert different GIS format data between the GIS ODBC layer and database. The second can be dealt by congruence of map layers that puts different types data in different map lays, then finding their space control points in order to superpose them, so different layers can become a due to their space relationships. The third can be managed by space data warehouse, in which data is divided into different levels by the scale, that is, headquarter stores the smallest scale data that are the most synthetic and therefore the least while bottom branch stores the largest scale data that are the most detail and, therefore the most, thus a data pyramid forms, and data can be transferred through different levels by space control points or a method what is called data abstract in the field of data warehouse. Integrating land and resource information aims to build a platform for the whole system. The platform is a land and resources information infrastructure that is based on data center, can manage all information, support all current popular GIS, and is able to transfer data seamless through different levels. In a word, the whole information system can be divided into two layers: the platform and upper function layer or MIS, and in theory, the former can supply any type, any block and even any scale data for the later.