在遥感图像处理软件(earth resource data analysis system,ERDAS)的支持下,以香日德绿洲为研究区,综合运用该软件提供的多种方法,分别计算了相关统计信息.利用相关系数矩阵、特征向量和特征值,按照最佳波段组合原则,得到了该区用于土...在遥感图像处理软件(earth resource data analysis system,ERDAS)的支持下,以香日德绿洲为研究区,综合运用该软件提供的多种方法,分别计算了相关统计信息.利用相关系数矩阵、特征向量和特征值,按照最佳波段组合原则,得到了该区用于土地利用与覆被(land use and land coverchange,LUCC)的波段组合为TM247(专题制图仪,thematic mapper,TM).TM145为提取居民点和水域的最佳组合,TM345为提取耕地、林地、草地的最佳组合.该方法及其思想不仅可用于确定陆地卫星影像中的最佳波段组合,而且可用于确定其他专题最佳波段组合中.展开更多
The coastline changes along Yemen's the Red Sea (Al-muka, Al-khohah, Al-tiaf, Ras Katib and Al-Urji spits) were studied using a series of landsat images (MSS, TM and ETM+, 1972, 1989, 2000, 2006), coupled with geo...The coastline changes along Yemen's the Red Sea (Al-muka, Al-khohah, Al-tiaf, Ras Katib and Al-Urji spits) were studied using a series of landsat images (MSS, TM and ETM+, 1972, 1989, 2000, 2006), coupled with geomorphological, sedimentological and meteorological findings. Comparison of satellite images provided a viable means for establishing long-term coastal changes (accretion and erosion) as observed in the studied spits (Al-Urj, Ras Sham, Ras Maemoon, Ras Katib, Al-Mandar, Nukhaylah, Mujamilah, Ras Ashab Abu-Zahr and Mukha). The rate of the spit accretion has the greatest value up to 89 pixel/year corresponding to 72 290 m2/year in Mukha, while the spit erosion shows greatest value up to 131 pixel/year corresponding to 106 404 m2/year in Mujamilah. The patterns of accretion and erosion along the spits depend on the spit direction, natural processes mainly of wave-induced longshore currents, the sediments supply and depth of sea.展开更多
针对建筑用地在提取过程中易与大面积裸露耕地和未利用地相混淆,且当前大多建筑用地提取指数阈值难以确定的问题,提出了利用多元信息提取城镇用地和农村居民地的方法。实验结果表明,利用农作物生长、成熟期的不同时相特征可有效削弱大...针对建筑用地在提取过程中易与大面积裸露耕地和未利用地相混淆,且当前大多建筑用地提取指数阈值难以确定的问题,提出了利用多元信息提取城镇用地和农村居民地的方法。实验结果表明,利用农作物生长、成熟期的不同时相特征可有效削弱大面积的裸露耕地对建筑用地提取精度的影响;构建的裸地弱化建筑指数(Bare Land Weakened Build-Up Index,BWBI)将建筑用地正值化、背景地物负值化,克服了大多数建筑指数阈值难以确定的缺点;利用DMSP/OLS夜间稳定灯光数据构建城镇缓冲区实现了城镇与农村居民地的半自动化提取,其提取精度均达到80%以上。展开更多
文摘在遥感图像处理软件(earth resource data analysis system,ERDAS)的支持下,以香日德绿洲为研究区,综合运用该软件提供的多种方法,分别计算了相关统计信息.利用相关系数矩阵、特征向量和特征值,按照最佳波段组合原则,得到了该区用于土地利用与覆被(land use and land coverchange,LUCC)的波段组合为TM247(专题制图仪,thematic mapper,TM).TM145为提取居民点和水域的最佳组合,TM345为提取耕地、林地、草地的最佳组合.该方法及其思想不仅可用于确定陆地卫星影像中的最佳波段组合,而且可用于确定其他专题最佳波段组合中.
文摘The coastline changes along Yemen's the Red Sea (Al-muka, Al-khohah, Al-tiaf, Ras Katib and Al-Urji spits) were studied using a series of landsat images (MSS, TM and ETM+, 1972, 1989, 2000, 2006), coupled with geomorphological, sedimentological and meteorological findings. Comparison of satellite images provided a viable means for establishing long-term coastal changes (accretion and erosion) as observed in the studied spits (Al-Urj, Ras Sham, Ras Maemoon, Ras Katib, Al-Mandar, Nukhaylah, Mujamilah, Ras Ashab Abu-Zahr and Mukha). The rate of the spit accretion has the greatest value up to 89 pixel/year corresponding to 72 290 m2/year in Mukha, while the spit erosion shows greatest value up to 131 pixel/year corresponding to 106 404 m2/year in Mujamilah. The patterns of accretion and erosion along the spits depend on the spit direction, natural processes mainly of wave-induced longshore currents, the sediments supply and depth of sea.
文摘针对建筑用地在提取过程中易与大面积裸露耕地和未利用地相混淆,且当前大多建筑用地提取指数阈值难以确定的问题,提出了利用多元信息提取城镇用地和农村居民地的方法。实验结果表明,利用农作物生长、成熟期的不同时相特征可有效削弱大面积的裸露耕地对建筑用地提取精度的影响;构建的裸地弱化建筑指数(Bare Land Weakened Build-Up Index,BWBI)将建筑用地正值化、背景地物负值化,克服了大多数建筑指数阈值难以确定的缺点;利用DMSP/OLS夜间稳定灯光数据构建城镇缓冲区实现了城镇与农村居民地的半自动化提取,其提取精度均达到80%以上。
基金National Natural Science Foundation of China(41571104,41101082)the Key Foundation Project of Basic Work of the Ministry of Science and Technology of China(2012FY111400)China Scholarship Council(20140491029)
