An improved technique for global daily sunshine duration estimation using satellite imagery  

作　　者：Muhammad Ali SHAMIM Renji REMESAN Da-wei HAN Naeem EJAZ Ayub ELAHI 

机构地区：[1]Department of Civil Engineering, University of Engineering and Technology, Taxila 47050, Pakistan [2]Department of Geography, University of Hull, HU6 7RX, UK [3]Department of Civil Engineering, University of Bristol, BS8 ITR, UK

出　　处：《Journal of Zhejiang University-Science A(Applied Physics & Engineering)》2012年第9期717-722,共6页浙江大学学报（英文版）A辑（应用物理与工程）

摘　　要：This paper presems an improved model for global sunshine duration estimation. The methodology incorporates geostationary satellite images by including snow cover information, sun and satellite angles and a trend correction factor for seasons, for the determination of cloud cover index. The effectiveness of the proposed methodology has been tested using Meteosat geostationary satellite images in the visible band with a temporal resolution of 1 h and spatial resolution of 2.5 km×2.5 km, for the Brue Catchment in the southwest of England. Validation results show a significant improvement in the estimation of global sunshine duration by the proposed method as compared to its predecessor （R2 is improved from 0.68 to 0.83, root mean squared error （RMSE） from 2.37 h/d to 1.19 h/d and the mean biased error （MBE） from 0.21 h/d to 0.08 h/d）. Further studies are needed to test this method in other parts of the world with different climate and geographical conditions.This paper presents an improved model for global sunshine duration estimation.The methodology incorporates geostationary satellite images by including snow cover information,sun and satellite angles and a trend correction factor for seasons,for the determination of cloud cover index.The effectiveness of the proposed methodology has been tested using Meteosat geostationary satellite images in the visible band with a temporal resolution of 1 h and spatial resolution of 2.5 km×2.5 km,for the Brue Catchment in the southwest of England.Validation results show a significant improvement in the estimation of global sunshine duration by the proposed method as compared to its predecessor(R 2 is improved from 0.68 to 0.83,root mean squared error(RMSE) from 2.37 h/d to 1.19 h/d and the mean biased error(MBE) from 0.21 h/d to 0.08 h/d).Further studies are needed to test this method in other parts of the world with different climate and geographical conditions.

关 键 词：Sunshine duration Geostationary satellite EVAPOTRANSPIRATION Solar radiation Remote sensing 

分 类 号：TP751[自动化与计算机技术—检测技术与自动化装置] P422.1[自动化与计算机技术—控制科学与工程]