Lancang River Basin is a typical mountain ecology system.With the cooperation development of the basin,mountain ecology system in this area is destroyed easily.Forest cover is a key fact about region environment chang...Lancang River Basin is a typical mountain ecology system.With the cooperation development of the basin,mountain ecology system in this area is destroyed easily.Forest cover is a key fact about region environment changes resulted by human action.Monitoring forest cover is very important for sustainable development of Lancang-Meigong international river.The main purpose of this study is to develop a monitoring methodology to acquire forest cover in mountain area of Lancang River Basin.Study results show that:the approach of monitoring forest cover in mountain area based on NDVI process such as in this study is of well practical value.This methodology is simple and the process is easy performed.Accuracy of monitoring forest cover satisfied the need of the cooperation development of Lancang River Basin.The methodology is suitable to apply in this mountain area.展开更多
Watershed landscape pattern is important of study basin’s development and sustainable utilization of natural resources based on the environment.Lancang Rive Basin in Yunnan province is of many special and important c...Watershed landscape pattern is important of study basin’s development and sustainable utilization of natural resources based on the environment.Lancang Rive Basin in Yunnan province is of many special and important characteristics.By selecting three case study areas in up\|stream,middle\|stream,down\|stream along with river basin,based on the theory of landscape ecology,the comparison and analysis are completed in three different cases in this paper.The results show that,in general,there are difference characteristics of landscape pattern in the different location along the River basin.Relatively,integrated quality of landscape of upstream and down stream is good than middle stream in Lancang River Basin.Especially in down stream area,there is a very good codition on its ecology richness and diversity index.One of the reason resulted out the difference in landscape along the river different location is its special natural condition.Another reasons dependence on condition of the local social,economy development,and the environment pressure of population.展开更多
文摘针对点云数据构建数字高程模型(DEM)的精度受点云抽稀和内插算法等因素影响的问题,设计不同点云抽稀方法和不同内插算法对DEM构建精度影响的两组试验,寻求适用于复杂条带状泥石流沟谷地形构建DEM的组合方法.利用空间抽稀、体素分割抽稀、随机抽稀3种方法以96%的抽稀率对原始点云数据进行抽稀,得到的抽稀结果再分别应用自然邻点插值法、反距离权重法(IDW)、克里金法、样条函数法4种内插算法进行内插,共构建出12种组合生成DEM的方法,对每种组合方法构建的DEM进行高程和坡度精度评价分析.结果表明,针对泥石流沟谷地形空间抽稀条件下利用IDW进行DEM内插的结果最为可靠,拟合优越度为0.999540,平均误差为0.7462 m,中误差为1.2629 m.
文摘Lancang River Basin is a typical mountain ecology system.With the cooperation development of the basin,mountain ecology system in this area is destroyed easily.Forest cover is a key fact about region environment changes resulted by human action.Monitoring forest cover is very important for sustainable development of Lancang-Meigong international river.The main purpose of this study is to develop a monitoring methodology to acquire forest cover in mountain area of Lancang River Basin.Study results show that:the approach of monitoring forest cover in mountain area based on NDVI process such as in this study is of well practical value.This methodology is simple and the process is easy performed.Accuracy of monitoring forest cover satisfied the need of the cooperation development of Lancang River Basin.The methodology is suitable to apply in this mountain area.
基金国家自然科学基金"九五"重点项目 (49631020) (Supported by the Key Project of the National National Science Foundation of China No.49631020) 云南省自然科学基金"九五"重点项目 (96D012Z) (Supported by me key Project of the Provincial Natural Science Foun
文摘Watershed landscape pattern is important of study basin’s development and sustainable utilization of natural resources based on the environment.Lancang Rive Basin in Yunnan province is of many special and important characteristics.By selecting three case study areas in up\|stream,middle\|stream,down\|stream along with river basin,based on the theory of landscape ecology,the comparison and analysis are completed in three different cases in this paper.The results show that,in general,there are difference characteristics of landscape pattern in the different location along the River basin.Relatively,integrated quality of landscape of upstream and down stream is good than middle stream in Lancang River Basin.Especially in down stream area,there is a very good codition on its ecology richness and diversity index.One of the reason resulted out the difference in landscape along the river different location is its special natural condition.Another reasons dependence on condition of the local social,economy development,and the environment pressure of population.
