近20年来南通市区城镇用地扩展遥感监测

Monitoring of Urban Expanding of Nantong City by Remote Sensing in the Last 20 Years

借助RS和GIS技术，利用TM卫星影像资料对近20年来南通市区城镇用地扩展过程进行了研究。结果表明，1984～2003年主城区扩展趋于缓慢，市区边缘带乡镇扩展速度加快。在扩展模式上。主城区先是沿着老城区填充式零星的扩展，然后逐步与周边乡镇连成一片，并形成新的扩展中心。城镇用地扩展的主要驱动力是工业化水平的提高。把市区城镇用地扩展图与土壤图相叠加，并参照1987年土地利用现状调查资料，结果表明南通市区城镇用地扩展主要侵占城市周边优质的菜地和农田。

On the basis of RS and GIS technology, urban spread of Nantong city over last two decades was studied. The results demonstrated that, the former major parts of the city were stabilized from 1984 to 2003 due to space limitation, and meanwhile, urbanization process in the peri - urban areas was accelerated, The modes of urban sprawl of city differed at different stages. At the first stage, the scattered towns and villages around the fringe of the city were rapidly urbanized. Then, the main blocks of city were connected with the urbanized peri - urban areas, and the new administrative and commercial centers were developed. According to the elty planning, the designed Economy Development District would be mostly subjected to urbanization in the near future. The main cause of the sprawl of town was the advance of industrialization lever. Furthermore, by overlaying the distribution map of new built - up areas on the soil map of the region, it was shown that significant decrease of soil area formerly used as vegetable lands and farmlands in the peri- urban zone.