Journal of Jilin University(Earth Science Edition) ›› 2015, Vol. 45 ›› Issue (5): 1547-1553.doi: 10.13278/j.cnki.jjuese.201505304

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A Pixel by Pixel Atmospheric Correction Algorithm and Its Application for MODIS Data Based on 6S Model

Xu Yan, Jiang Qigang   

  1. College of GeoExploration Science and Technology, Jilin University, Changchun 130026, China
  • Received:2015-01-17 Published:2015-09-26

Abstract:

In order to obtain the real reflectance of earth objects, we introduced a new method to correct atmospheric parameters pixel by pixel. Considering with the six parameters, including solar zenith angle, sensor zenith angle, azimuth angle, aerosol optical depth, observation band, and surface elevation, we applied the 6S model pixel by pixel to generate a lookup table for analyzing the sensitivity of each parameter to reflectance; and compared the correction results with the ones by the old method using single parameter. The results show that the reflectance by 6S model pixel by pixel is much closer to the true reflectance of objects. By using the MODIS surface reflectance products, we verified the accuracy both of the 6S model pixel by pixel and the single parameter method, and found that their relative errors are 12.7% and 26.9% respectively. Taking vegetation index (NDVI) as an example for the subsequent quantitative remote sensing inversion, the NDVI by 6S pixel by pixel method is 14.4% higher than the single parameter atmospheric correction method.

Key words: pixel by pixel, 6S, lookup table, atmospheric correction

CLC Number: 

  • P407.8

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