Urban Built-up Area Assessment of Ranchi Township Using Cartosat-I Stereopairs Satellite Images
Urban Built-up Area Assessment of Ranchi Township Using Cartosat-I Stereopairs Satellite Images
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利用 Cartosat-I 立体卫星影像对兰契镇城市建成区进行评估
DOI：
10.1007/s12524-012-0209-4
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发表时间：
2013
影响因子：
2.5
通讯作者：
A. Jeyaseelan
中科院分区：
文献类型：
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作者：
A. Pandey;Amit Kumar;A. Jeyaseelan
在本研究中，利用Cartosat-I数字高程模型（DEM）推导了兰契城区的垂直特征及其与长期建成区扩张的关系（1927-2010）。DEM显示地形起伏在595米至754米之间，大部分地区坡度为3°，3°至6°，表明Ranchi镇地形平坦至起伏。DEM用于生成城市区域内水槽的位置，这些水槽通常沿着排水通道，毗邻高层建筑用地和高架公路网划定。参考地形起伏带考察了80 a来城市扩张的格局，结果表明，建成区增长主要发生在中高程（620 ~ 660 m）（67.0%）和高程（660 ~ 680 m）（19.8%）区域。虽然早期对建筑开发的偏好更多是在高海拔地区（660-680米），但现在更倾向于地下水可用性更好的多层建筑用地开发（< 600-620米）。利用Cartosat-I DEM获取的等高线密度对建成区垂直生长的空间格局进行了评价。结果表明，高密度等高线主要对应于丘陵地区和高层建筑。1996年以后，兰契镇的城市扩张格局和人口趋势呈现出垂直建成区快速增长的趋势，标志着城市密度化的开始。
In the present study, the Cartosat-I digital elevation model (DEM) was utilized to deduce the vertical characteristics of Ranchi urban area and its relation to long term built-up expansion (1927–2010). The DEM represents moderate variation in terrain relief ranging from 595 m to 754 m with majority of area exhibiting upto 3° of slope and 3° to 6° indicating flat to undulating nature of terrain in Ranchi township. The DEM was used to generate location of sinks within urban area, which are generally delineated along the drainage channels, adjacent to high-rise built-up land and along the elevated road network. The pattern of urban sprawl over the eight decades (1927–2010) were examined with reference to terrain relief zones, which indicated that the built-up growth was mainly taken place over the elevation range of moderate (620–660 m) (67.0%) and high relief (660–680 m) (19.8%) zones. Although earlier preference for built-up development was more in high elevation zones (660–680 m), the low elevation zones (<600–620 m) are now preferred for multistoried built-up land development where better groundwater availability occur. The spatial pattern of vertical growth of built-up land was assessed using contour density obtained from Cartosat-I DEM. The results show that the high density contours predominately correspond to hilly area and high-rise buildings at majority of locations. The urban sprawl pattern and population trend exhibited rapid increase in vertical built-up growth after 1996 indicating beginning of urban densification in Ranchi township.