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遥感技术与应用  2019, Vol. 34 Issue (2): 398-403    DOI: 10.11873/j.issn.1004-0323.2019.2.0398
遥感应用     
使用MODIS近红外图像直接计算地表水汽压的研究—以贵州省为例
罗庆洲,朱传武,王培法
(南京信息工程大学地理科学学院,江苏 南京 210044)
Study on Estimating Surface Vapor Pressure Directly from MODIS Near-infrared Images:A Case of Guizhou Region
Luo Qingzhou,Zhu Chuanwu,Wang Peifa
(School of Geographical Sciences,Nanjing University of Information Science and Technology,Nanjing 210044,China)
 
 全文: PDF(4724 KB)  
摘要: 为提高地形复杂区域地表水汽压的计算精度,同时避免间接法计算需要大气可降水量中间数据,以贵州省为例,研究使用MODIS近红外数据直接估算晴空地表水汽压。构建了指数、多项式、通道值线性组合、集成形式4种直接法模型,并分吸收通道、分遥感值(反射率与辐亮度)建立了24个回归公式,根据计算站的拟合结果筛选了最优的直接法模型,最后对比了直接法和间接法的计算精度。研究结果表明:采用集成第17通道与第2通道反射率比值和高程信息的直接法模型拟合精度最高,决定系数R2为0.741,剩余标准差(RSE)为1.098 hpa;该直接法的绝对误差、相对误差的均值分别为1.234 hpa和8.2%,均低于间接法的1.806 hpa和12%。
关键词: 地表水汽压复杂地形大气可降水量近红外通道    
Abstract: In this paper,we present a method of obtaining instantaneous surface vapor pressure in complex terrain region.The proposed algorithm estimates surface vapor pressure over cloud-free land area using MODIS near-infrared data directly,instead of using MODIS total precipitable water data.Guizhou province is selected as study region.There are four direct models,exponential model,polynomial model,channels linear model and integrated model,are developed.In each model,we can choose one from three absorption channels(17,18 and 19),and choose one from two remote sensing images(reflectance and radiance).So twenty-four equations are built to calculate surface vapor pressure.According to the regression calculation of ground stations,we select the best fitting equation.We compare the errors between the direct method and the indirect method.The result shows the integrated model(equation 27) is the best fitting equation,which gives R2 0.741 and residual standard error(RSE) 1.098 hpa.This integrated model calculates surface vapor pressure using reflectance ratio of channel 17 to channel 2 and elevation information.The mean absolute error and mean relative error of this proposed direct method are 1.234hpa and 8.2% respectively,which are lower than 1.806 hpa and 12% of indirect method.

Key words: Surface vapor pressure    Complex terrain    Total precipitable water    Near-infrared channels
收稿日期: 2018-03-05 出版日期: 2019-05-13
ZTFLH:  P407  
基金资助:

国家自然科学基金项目(41001288、41571418),南京信息工程大学大学生实践创新训练计划项目。

作者简介: 罗庆洲(1979-),男,浙江平阳人,博士,副教授,主要从事遥感信息处理与气象应用研究。E-mail:luofirst@126.com。
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引用本文:

罗庆洲, 朱传武, 王培法. 使用MODIS近红外图像直接计算地表水汽压的研究—以贵州省为例[J]. 遥感技术与应用, 2019, 34(2): 398-403.

Luo Qingzhou, Zhu Chuanwu, Wang Peifa. Study on Estimating Surface Vapor Pressure Directly from MODIS Near-infrared Images:A Case of Guizhou Region. Remote Sensing Technology and Application, 2019, 34(2): 398-403.

链接本文:

http://www.rsta.ac.cn/CN/10.11873/j.issn.1004-0323.2019.2.0398        http://www.rsta.ac.cn/CN/Y2019/V34/I2/398

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