Effects of Atmospheric Corrections on NDVI of Sentinel-2 Images of Coastal Wetlands
In order to eliminate the atmospheric interference during the imaging process of satellite images and restore the real feature reflectivity,atmospheric correction has become a key link in quantitative remote sensing analysis research.In this paper,based on the Sentinel-2 images of the Yellow River Delta for 5 periods from 2018 to 2022,we explored the necessity of atmospheric correction for NDVI calculation by comparing and ana-lyzing the NDVI before and after atmospheric correction.The results are as follows.(1)the atmospheric cor-rection can significantly affect the overall NDVI of the Sentinel-2 images of coastal wetlands,as well as the NDVI of different land classes,but there is uncertainty in the effect on the NDVI of the Yellow River in differ-ent years;(2)there is no significant difference in the changes of spectral characteristics of NDVI between dif-ferent land classes before and after atmospheric correction,but the atmospheric correction effectively enhances the range of NDVI extreme deviation and improves the differentiation of NDVI between different land classes.This study provides a reference basis for research on the effect of atmospheric correction on NDVI.
atmospheric correctioncoastal wetlandsSentinel-2 imagesNDVIthe Yellow River Delta
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