Land use changes in a reddish soil erosion region of Southern China: Hetian Basin,County Changting

According to the analysis of remotely sensed data and other multi-information of study area (its longitude: 113.5°-117° and latitude 39.5°-42°), the authors dynamically evolved desertification of Beijing and its neighboring areas, which the images were used in three different periods, 1987 TM, 1996 TM and the CB-1s CCD 4, 3, 2 bands of 2000, 4 orbits and 16 (CBERS-1) scenes (the resolution is 19.5m). By synthetically analysis, we obtained the area desertification distribute and evaluated space-time information. Based on the remote sensing interpretation and database of desertification multi-information efficiency distilled from geology, hydrography, anthropogeography, agrotype, vegetation and so on, we build up desertification dynamic simulation model with CA (Cellular Automata) theory and GIS (Geographic Information System) tool. Then utilizes this model to predict desertification development of Beijing and its neighboring areas. The result of the experiment proves that the model is effective to simulate desertification development in terms of macroscopic and microcosmic. The desertification of Beijing and its neighboring areas develop from west to the east, the southern edge is 72km to Beijing city where lies in the north of Jundu mountain crossing Yanshan with Taihang mountains, which prevents the development of desertification.

Dynamic evolvement of desertification in Beijing and its neighboring areas

The rapid land use changes result in the difficulties in timely updating the information of land resources using traditional methods. In order to resolve the difficulties, this paper discusses the principles and methods for dynamic monitoring land use changes and timely updating the database of land resources using the technology of remote sensing (RS), geographical information system (GIS) and global positioning system (GPS), which are also called ‘3S’ technology. Remote sensing is used for change detection of land use, GPS for locating the detected change areas with accurate position data, and GIS for establishing the spatial database of land use and for further analysing and updating the data. A real computer system for the above purpose is established for Fuqing County of Fujian province, China, based on the ‘3S’ technology. The system possesses the functions of dynamic monitoring land use changes and timely updating the data of land use as well as the functions of a general database manage system.

A Dynamic Monitor System for Land Use Change at a County Level Based on the Technology of Remote Sensing,Geographical Information System and Global Positioning System

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A Dynamic Monitor System for Land Use Change at a County Level Based on the Technology of Remote Sensing,Geographical Information System and Global Positioning System