中文摘要：

简化或积分算法计算邻近辐射,对山区或处于近红外波段的植被等情况产生较大误差。尽管近似离散求和算法考虑了所有因子,然而由于算法的复杂性,未做出更加详尽细致的分析。针对上述问题,本文在考虑每个邻近像素地表单元的辐射对目标像素影响的基础上,重点分析了在一定的范围内所有与目标地表单元通视且朝向目标地表单元的邻近像素,同时考虑搜索半径的问题。试验证明,该算法获得比传统算法更加精确的邻近辐射计算结果。

英文摘要：

Adjacent radiation,calculated according to simplified algorithm and integral algorithm,would be overestimated in special cases,such as mountains area or vegetation in near infrared band.Although the approximate dispersion sum algorithm has taken all factors into account,it didn＇t make detailed analysis on algorithm implementation owing to complexity of calculating.Therefore,a precise algorithm was proposed in this paper.In the precise algorithm,the effects of the radiation of every adjacent pixel surface unit on target pixel have been considered,including all adjacent pixels which are oriented towards the target pixel and not hidden from the target pixel.Meanwhile,searching radius of adjacent pixels has been analyzed in this paper.The experiments have proved that the results of the precise algorithm are more accurate than that of the conventional algorithms.