Using remote sensing and GIS to detect and monitor landuse and land cover change in Dhaka Metropolitanof Bangladesh during 1960–2005
作者：Ashraf M. Dewan , Yasushi Yamaguchi 出版商：Environ Monit Assess 出版日期：2007
年 1 月
Abstract:This paper illustrates the result of land use cover change in Dhaka Metropolitan of Bangladesh using topographic maps and multi-temporal remotely sensed data from 1960 to 2005. The Maximum likelihood supervised classification technique was used to extract information from satellite data, and post-classification change detection method was employed to detect and monitor land use/cover change. Derived land use/cover maps were further validated by using high resolution images such as SPOT, IRS, IKONOS and field data. The overall accuracy of land cover change maps, generated from Landsat and IRS-1D data, ranged from 85% to 90%.The analysis indicated that the urban expansion of Dhaka Metropolitan resulted in the considerable reduction of wetlands, cultivated land, vegetation and water bodies. The maps showed that between 1960 and 2005 built-up areas increased approximately 15,924 ha, while agricultural land decreased 7,614 ha, vegetation decreased 2,336 ha, wetland/lowland de-creased 6,385 ha, and water bodies decreased about 864 ha. The amount of urban land increased from 11% (in 1960) to 344% in 2005. Similarly, the growth of landfill/bare soils category was about 256% in the same period. Much of the city’s rapid growth inpopulation has been accommodated in informal settlements with little attempt being made to limit the risk of environmental impairments. The study quantified the patterns of land use/cover change for the last 45 years for Dhaka Metropolitan that forms valuable resources for urban planners and decision makers to devise sustainable land use and environ-mental planning
声明：本站文献资源来源于网络，仅供学习交流使用，不得以任何形式用于商业用途，请于浏览后24小时内删除。如有疑问欢迎与我们联系，感谢您的支持。
