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首页> 外文会议>2015 Eighth International Conference on Advances in Pattern Recognition >Effect of cirrus cloud on normalized difference Vegetation Index (NDVI) and Aerosol Free Vegetation Index (AFRI): A study based on LANDSAT 8 images
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Effect of cirrus cloud on normalized difference Vegetation Index (NDVI) and Aerosol Free Vegetation Index (AFRI): A study based on LANDSAT 8 images

机译：卷云对归一化植被指数（NDVI）和无气溶胶植被指数（AFRI）的影响：基于LANDSAT 8图像的研究

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摘要

The present study is an attempt to identify the influence of cirrus cloud on NDVI and AFRI values and to check the scope of replacing NDVI with AFRI in cirrus affected satellite images. Multi-spectral channels of LANDSAT-8 satellite image collected for two different dates of acquisition are used in the current study. Reflectance values of cirrus band are used for correcting red and near infra-red spectral channels based on standard cirrus correction algorithm. The NDVI values obtained after cirrus correction is found to be significantly more than that of NDVI values without cirrus correction. In the case of AFRI(2.1m), the difference in values between before and after cirrus correction is found to be considerably lower than that of NDVI variation. These outcomes show the suitability of AFRI(2.1m) over NDVI for cirrus affected satellite images. The results of analysis also reveal that NDVI difference is directly proportionate with optical thickness and ice particle size distribution of cirrus clouds.
机译：本研究旨在确定卷云对NDVI和AFRI值的影响，并检查在卷云受影响的卫星图像中用AFRI替代NDVI的范围。在本研究中使用了针对两个不同采集日期采集的LANDSAT-8卫星图像的多光谱通道。卷云波段的反射率值用于根据标准卷云校正算法校正红色和近红外光谱通道。发现卷云校正后获得的NDVI值明显大于未进行卷云校正的NDVI值。在AFRI（2.1m）的情况下，发现卷云校正前后的值差明显小于NDVI变化值。这些结果表明，AFRI（2.1m）在NDVI上对卷云影响的卫星图像的适用性。分析结果还表明，NDVI差异与卷云的光学厚度和冰粒径分布成正比。

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