基于Landsat-8影像的高原湖泊水体表面温度反演  

Retrieval of Lake Surface Temperature in Plateau Based on Landsat-8 Images

作　　者：杭媛芳 张鹏林[2,3] HANG Yuanfang;ZHANG Penglin(College of Science,Tibet University,Lhasa 850000,Tibet,China;School of Remote Sensing Information Engineering,Wuhan University,Wuhan 430079,Hubei,China;Hubei Luojia Laboratory,Wuhan 430079,Hubei,China)

机构地区：[1]西藏大学理学院,西藏拉萨850000 [2]武汉大学遥感信息工程学院,湖北武汉430079 [3]湖北珞珈实验室,湖北武汉430079

出　　处：《应用科学学报》2024年第6期977-987,共11页Journal of Applied Sciences

基　　金：安徽省自然资源调查监测评价体系研究项目(No.2021-K-1)资助。

摘　　要：目前,在高原环境下的水体表面温度反演成果相对较少,本文结合Landsat-8影像和辐射传输方程法对纳木错湖水体表面温度进行反演并验证其有效性。首先,计算研究区的地表比辐射率;其次,计算同温度下黑体的辐射亮度;最后,利用普朗克函数计算水体表面温度并基于MODIS地表温度产品对反演结果进行验证。实验结果表明,湖泊水体表面温度反演绝对误差最小值为0.449℃、最大值为1.685℃,均方根误差最小值为1.269℃、最大值为1.781℃,反演结果与MODIS温度产品的日均温结果较接近,夏季湖泊水体表面温度变化特征基本与纳木错气温一致。该方法可为后续高原湖泊水体水表温度反演研究提供一定的参考。At present,there are few studies on water surface temperature retrieval in the plateau environments.This paper combined Landsat-8 image and radiative transfer equation method to invert the water surface temperature in Namco Lake and verify its effectiveness.First,the surface-specific emissivity of the study area is calculated.Second,the radiation brightness of the blackbody at the same temperature is determined.Finally,the Planck function is used to calculate the water surface temperature and MODIS surface temperature products is used to validate the inversion results.Experimental results show that the minimum absolute error of lake surface temperature retrieval is 0.449℃,with a maximum error of 1.685℃.The minimum root mean square error ranges from 1.269℃ to 1.781℃.The inversion results are close to the average daily temperature results fromMODIS products.The variation characteristics of lake surface temperature in summer arebasically consistent with the temperature of Namco Lake.This method provides a referencefor future research on water surface temperature retrieval in plateau lakes.

关 键 词：高原湿地 湖泊表面温度反演 辐射传输方程法 纳木错湖 Landsat-8 

分 类 号：TP79[自动化与计算机技术—检测技术与自动化装置]