资源简介

摘要： 为探讨FLAASH大气校正模型对高程和大气模式参数的敏感性,以中纬度夏季和亚极地夏季大气模式过渡区的两景Landsat8 OLI遥感影像为基础,从高程、大气模式及其综合作用进行了对比分析。实验结果表明:①单景影像而言,FLAASH模型与高程和两种大气模式敏感性不强,各波段反射率平均值相差在0.21%以内;②在相邻两景影像重叠区,FLAASH模型与高程和大气模式敏感性明显加强,可见光波段反射率均值相差在0.5%~1.29%之间;③FLAASH模型能有效去除Landsat8影像的大气影响,并使图像信息增强,大气校正的作用效果在短波波段更加明显。 关键词： FLAASH模型;  Landsat8 OLI;  大气校正     Abstract: In order to analyze the sensitivity of Atmospheric Model and Ground Elevation to FLAASH model,the effects of Ground Elevation and atmospheric Model in FLAASH Model were systematically analyzed with two landsat8 OLI images which located in atmospheric model transition area of Mid-Latitude Summer and Sub-Arctic Summer.Preliminary results showed that:① The average difference of reflectance image was less than 0.21% ,which revealed that FLAASH model isn’t sensitive to atmospheric Model and Ground Elevation in the case of a single image;② In overlapping region of the two neighboring images,the average difference of reflectance image increased from 0.5% to 1.29% in visible bands,which show that sensitivity of Atmospheric Model and Ground Elevation to FLAASH model significantly increased;③ The FLAASH model can not only eliminate the effect of atmospheric scattering and atmospheric absorption upon Landsat8 images,but also can enhance image information.The effect of atmospheric correction was obvious especially in shortwave bands.

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