RS与GIS支持下珠江三角洲城镇近期发展对土壤资源利用的影响分析

在RS与GIS支持下,从TM卫星影像提取出珠江三角洲近期城镇建筑覆盖变化专题信息,利用土壤资源农业适宜性评价专题图对比城镇建筑扩展对土壤资源利用的影响,设计了土壤资源占用商指标(SU),以此刻划土壤资源受城镇建筑扩展影响的强度。结果表明:土壤资源质量越高,受城镇发展的影响越深刻。

Analysis of the impacts of recent urban development in the Pearl River Delta on soil resources based on RS and GIS

Based on RS and GIS technology,the authors set up a soil resources agriculture suit-ability evaluation spatial database of the Pearl River Delta in ArcInfo8.02,and built-up land-cover change theme information were extracted from TM imageries.10TM imageries taken in1988and1998were used to get the built-up area theme information.With the help of PCI soft-ware,the authors selected the MLC to do their job.Two built-up land-cover classes were extract-ed from the whole12classes of imagery classification.The authors designed an index called SU to describe the in tensity of soil resources effected by urban built-up land-cover change.The re-sults show that the higher quality soil resources are more easily used as urban built-up land.