摘要
无人机多光谱遥感影像可以较好的实现水质定量反演,而目前无人机遥感定量分析缺乏光谱时空变化对光谱特征信息影响的研究。为探究时空分辨率对光谱反射率的影响,以复杂及单一水面多光谱反射率为研究对象,对比分析了两个时间点(12:00和15:00)以及7个不同飞行高度(100 m、125 m、150 m、175 m、200 m、225、250 m)的多光谱影像。研究表明,12:00时拍摄的多光谱影像效果最好,不同通道的光谱反射率随高度的变化呈现出差异性,并且复杂水面的光谱信息更丰富。研究的方法和结果为多光谱遥感定量遥感的时间选择和空间分辨率选择提供理论依据。
UAV multispectral remote sensing images can better achieve quantitative inversion of water quality, while the current quantitative analysis of UAV remote sensing lacks the study of the influence of spectral spatial and temporal variations on spectral feature information. To explore the influence of spatial and temporal resolution on spectral reflectance, the complex and single multispectral reflectance of the water surface was used as the research object, two time periods(12:00 and 15:00)and 7 different flying heights(100,125, 150, 175, 200, 225, 250 m)multispectral images were compared and analyzed. Studies have shown that, the effect of multispectral images taken at 12:00 is the best. The spectral reflectance of different channels varies with height, and the spectral information of complex water surfaces is richer. It can be used for UAV-based water quality evaluation or validation of auxiliary high-altitude images.
作者
王迎飞
肖敏
周爽爽
黄应平
靳专
熊彪
Wang Yingfei;Xiao Min;Zhou Shuangshuang;Huang Yingping;Jin Zhuan;Xiong Biao(College of Computer and Information Technology,China Three Gorges University,Yichang 443002;College of Hydraulic&Environmental Engineering,China Three Gorges University,Yichang 443002;Hubei Engineering Technology Research Center for Farmland Environment Monitoring,China Three Gorges University,Yichang 443002;Engineering Research Center of Eco-Environment in Three Gorges Reservoir Region of Ministry of Education,China Three Gorges University,Yichang 443002)
出处
《现代计算机》
2021年第36期60-66,95,共8页
Modern Computer
基金
国家自然科学基金(22136003)
湖北省引智项目(2019BJH004)
长江水环境教育部重点实验室(同济大学)开放基金项目(YRWEF202103)。
关键词
无人机
多光谱
时空分辨率
光谱反射率
unmanned aerial vehicle(UAV)
multispectral image
spatial and temporal resolution
spectral reflectance
