广西喀斯特地区城镇用地扩张及来源预测——以河池市金城江区为例

Urban Land Expansion and its Origin Forecast in Karst Dristrict of Guangxi Province:A case study of Jingchenjiang in Hechi city

以河池市金城江区1991,1999,2006年三期TM/ETM+遥感影像为数据源,分析了城镇用地的遥感信息机理,提取了研究区三期土地利用现状图,并采用GIS空间分析技术,对城镇用地扩张的时空过程进行了研究.分析表明:城镇用地规模不断扩大,增长速度不均匀,城镇用地变化区域差异较大,城镇用地在中心城镇高度集聚.旱地、荒草地、独立工矿用地和坑塘水面是城镇用地扩张的主要来源.

Based on TM or EMT ＋ data of 1991, 1999 and 2006, three-period land use map in Jingchenjiang of Hechi city was mapped by interpretation image and the spatial feature of urban land expansion was analyzed using geographic information system. The result show that the scope of urban land is increasing, the increasing speed is odd, urban land change is different and urban land is highly centralized in the center town . Dry soil, barren grassland, independent mines and water are main origin of urban land expansion.