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Recent work has established the utility of waveform sampling lidar for predicting forest structural attributes. Nevertheless, serious obstacles to its wide-spread use still exist. They include the lac...
The Landsat archive of thermal data (Landsats 4, 5 and 7) has gone through a rigorous calibration assessment and update. However, in order to be useful to most users the calibrated sensor reaching rad...
Surface mining for coal has disturbed large land areas in the Appalachian Mountains. Better information on mined lands' ecosystem recovery status is necessary for effective environmental management in...
Sand dredging has been practiced in rivers, lakes, harbours and coastal areas in recent years in China mostly because of demand from construction industry as building material. Sand dredging has distu...
It is widely accepted that land degradation and desertification (LDD) are serious global threats to humans and the environment. Around a third of savannahs in Africa are affected by LDD processes that...
In this study we analyse the correlation between the spatial positions of Capra ibex (mountain goat) on an hourly basis and the information obtained from vegetation indices extracted from Landsat 8 da...
One of the most basic classification tasks is to distinguish bare-soil areas from urban region. Bare-soil plays an important role in the ecosystem. It could be the reason of dust storms and the indica...
This paper presents an innovative methodology for the registration of multiple satellite scenes by using a global Least Squares adjustment. The main advantage in relation to traditional approaches con...
In the forests of south west Western Australia dramatic declines in tree health have been observed in recent years. The species Eucalyptus wando has exhibited loss of crown foliage in increasing stage...
Wetland is a versatile, rich biological diversity ecosystems on the planet which is one of the most important living environment of human beings. As the representative data of mid-resolution data, ET...
Crop mapping and time series analysis of agronomic cycles are critical for monitoring land use and land management practices, and analysing the issues of agro-environmental impacts and climate change....
Mapping of sugarcane planted area is an important information for decision making, mainly when the search for alternatives to mitigate greenhouse gas emissions has indicated theuse o...
以胶州湾及周边海岸带为研究区,采用Landsat 7 ETM+数据,提出一种基于à trous小波变换的全色图像和多光谱图像融合改进算法。对全色图像和多光谱图像进行适当层数的小波分解,多光谱图像的低频部分采用全色图像和其低频分量的比来调制; 最高分解层外的其余分解层采用多光谱图像和全色图像在该层分解系数的加权和,加权系数由局部区域能量比来确定; 最高分解层则采用绝对值最大准则。实验表明,该方法得到...
首先,利用Landsat TM热红外影像结合地面气象观测资料反演地面温度,揭示了济南市夏季城市热岛效应| 然后,基于稳 健的LTS与最小二乘回归(LS)分析探讨了城乡地面热辐射与地表特征参数的线性变化趋势,认为植被指数(NDVI、SAVI和TCG)、 湿度指数(NDMI和TCW)以及近红外反照率与地表温度的变化趋势相反,亮度指数(NDBI和TCB)和可见光反照率与地表温度的变化 趋势一致,而...
以长沙市为例,在多时相Landsat遥感数据支持下,采用监督分类、非监督分类和归一化裸露指数(NDBI)等方法提取城市用地信息。通过对比多期城市用地的熵值变化,定量分析城市扩张的时空特性; 运用叠加、缓冲区分析等方法,分析城市扩张和中心城区的关系,绘制城市扩张速度玫瑰图。研究结果表明,长沙市建成区总面积不断扩展,其中,1973~1986年扩张主要表现在东南方向,1987~1993年为西部方向,19...

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