Landsat-8与ZY-3卫星影像降尺度地表温度反演及分析  

Retrieval and Analysis of Downscaling Land Surface Temperature Based on Landsat-8 and ZY-3 Satellite Imagery

作　　者：刘彬 张友水[1] LIU Bin;ZHANG Youshui(Fujian Normal University,Fuzhou 350007,China)

机构地区：[1]福建师范大学地理科学学院,福州350007

出　　处：《遥感信息》2018年第4期28-34,共7页Remote Sensing Information

基　　金：福建省自然科学基金项目(2018J01739)

摘　　要：地表温度(land surface temperature,LST)在表征地表能量转换和气候方面具有很重要的作用。目前获取的高空间分辨率遥感影像,通常没有热红外波段,而能获取的热红外影像,空间分辨率往往不够。针对时间分辨率和空间分辨率的矛盾问题,提出了一种利用降尺度进行地表温度反演的方法。该方法利用Landsat-8卫星影像的热红外波段进行地表温度LSTOLI,30m反演;根据不同地物的光谱特性,选取代表城市热特性的地物端元,对ZY-3多光谱影像大气校正后,进行混合像元分解,获取每个像元内不同端元的丰度,利用端元的平均温度建模,估算地表温度,得到高空间分辨率的地表温度LSTZY-3,5.8m。为了验证估算结果的准确性,将LSTZY-3,5.8m升尺度为30mLSTZY-3,30m,与LSTOLI,30m进行对比。结果表明,LSTZY-3,30m和LSTOLI,30m具有很高的一致性,精度较高。这种方法可以作为一种实用的估算地表温度的方法。Land Surface Temperature(LST)plays an important role in characterizing energy exchanges of the Earth’s surface and atmosphere.The current high spatial resolution remote sensing images usually have no thermal infrared bands,and the opposite is the thermal infrared images are often associated with a low spatial resolution.In order to solve the contradictions of temporal and spatial resolution,this paper uses thermal infrared band of Landsat-8 to retrieve land surface temperature(LST OLI,30 m),then chooses endmembers representing the properties of a city using the spectral characteristics of different ground objects with ZY-3 satellite images to decompose mixed pixels.Then,it makes a model based on the average temperature of endmembers after getting the fraction of different components in each pixel to estimate land surface temperature of ZY-3 image,thus obtaining high spatial resolution land surface temperature LST ZY-3,5.8 m.In order to verify the accuracy of the estimation results,upscaling the LST ZY-3,5.8 m to LST ZY-3,30 m,through visual qualitative and quantitative statistical index to analyze the results.The results show that LST ZY-3,30 m has a high consistency with LST OLI,30 m,and the accuracy is also high with root mean square errors and mean absolute errors.This method can be used as a practical method of estimating the land surface temperature.

关 键 词：地表温度 降尺度 温度反演 混合像元分解 ZY-3影像 

分 类 号：TP751[自动化与计算机技术—检测技术与自动化装置]