Research on the National Land Information System in China
Jiang Jingtong
Research Institute of Surveying and Mapping
National Bareau of Sureveying and mapping
Beijing, China
Abstract
The National Land Information System is being developed by the Research Institute of Surveying and Mapping, the National Bureau of Surveying and Mapping since 1984. It is one of the largest nation-wide geographic information systems in China. This paper shows the background, hardware and software environment, components and logical structure, data base design, applications and future development of the system.
Introduction
With the science and technology development, geographic information system (GIS) has increasingly become one of the indispensable technical tools for management of resources and environment, national and regional planning or decision-making in the world. A lot of systems have been developed, or are being developed in China as well. Among them are some nationwide or regional systems, such as the National Economic Information System, the Loess Plateau Information System, the Territorial Resources Information System, etc. All of these systems need common basic data as the basis for locating their special data, to ensure all data can be shared and systems can be compatible with each other. The National lal Information System (NLIS) will play an important and hopeful role in realizing these purposes.
According to statistics, more than 1,000,000 sheets of maps at the scales from 1:10,000 to 1:1,000,000 are used each year in almost every government department, national economy organization, institutes, universities and other organs in China. They need to obtain the current basic national land information with high quality very quickly. Only the NLIS could satisfy their needs.
By now, information captured from nearly all technical fields of surveying and mapping, such as geodesy, photogrammetry, remote sensing, cartography, tends to be in the digital form.
The NLIS will be the good linkage and end-result of these technic developing trends.
The NLIS, as one kind of GIS, is being developed by the Research Institute of surveying and mapping, the National Bureau of Surveying and Mapping (RISM , NBSM) since 1984. it is the
major information system of the NBSM and one of the sub-systems of the national Economic Information System in China. Actually it is a common basic information system in China.
The NLIS is divided into two levels: the national Center system in Beijing is at the national level (the first level), and the Subsystems in each province are at the provincial level (the second level) . (see Fig.1)
Figure 1 The levels of the NLIS
