丘陵地形影响下的长沙市用地扩张
首发时间:2016-02-01
摘要:以长沙市1989、1999、2009年TM影像和DEM图像为数据源,利用RS,GIS等分析手段,建立了长沙市建成区数据库并生成了高程、坡度和地形位指数图。然后将高程分带、坡度分级、地形位分级分别与不同时期的长沙市建成区进行叠加分析,探讨各地形因子对丘陵城市用地扩张的影响。结果表明,长沙市用地扩张选择在第5、6、7高程带上的平地和缓坡地段进行,主要分布在中地形位等级的地形环境中。通过比较分析,可以看出丘陵城市的特殊地形,决定着城市的基本格局,引导着城市的扩张方向,并改变着城市的扩张模式。
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Land expansion under the influence of the hilly terrain in Changsha
Abstract:Basing on Changsha's TM images and DEM data of the year 1989, 1999 and 2009,making use of analytical tools such as RS, GIS, the built-up area's database of Changsha city has been established,and the elevation, slope, and terrain-index maps have also been created. Then make an overlay analysis between elevation distribution figure, slope classification figure, terrain-index classification figure and built-up area's map respectively to explore how the terrain impacts on hilly urban land expansion. The analysis suggests that the land expansion of Changsha city occurred on the flat and gentle slop of the 5th, 6th, and 7th elevation area, mainly distributes in the place with medium terrain niche. The comparative analysis makes clear that the unique topography of the hilly city will determine the macroscopic structure of the city, guide the direction of urban expansion, and change the mode of urban sprawl.
Keywords: hilly terrain land expansion terrain factor terrain niche index
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No.4643390106264914****
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