GIS-BASED ANALYSIS OF EXISTING LANDUSE IN THE LOWER YELLOW RIVER
黄河下游堤内滩地土地利用的GIS分析

Existing landuse database system (DBS) in the area between two fjood-control dykes of the lower yellow River from Huayuankou to sunkou, based on ARC/INFO geographical information system software, was developed by using landuse interpretation maps of air infrared photos taken in June, 1988, and other thematic maps such as topographical maps. DBS is comprised of database and database management system (DBMS).The database consists of existing landuse, floodland distribution, digital elevation model. The data model is a hybrid of relational and topological models. Locational data may be represented explicitly, or topologically, as a series of x,y coordinate, Attribute data, discribing feature names, symbols and classification, are stored in feature attribute tables.Polygon overlay and isomorphic buffer operation are used to study the landuse structure and the landuse difference among three kinds of floodland. Landuse data were traped on digital elevation model (DEM), showing the spatial distribution of existing landuse and floodland.GIS-based analysis of existing landuse is featured by use of multisources information and information integration through ARC/INFO, powerful analsis functions such as spatial retrieval and query, statictical calculation and space modelling .