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MODIS,a good remote sensing image data source,is suitable to monitor cyanobacteria bloom for its free and high time resolution,however,MODIS sensor receives distorting signals,due to the interaction between solar radiation and atmosphere,and atmospheric correction is necessary to acquire true surface reflectance and improve the accuracy of monitoring cyanobacteria bloom. In this paper,the basic theory of FLAASH atmosphere correction model attached in ENVI software,which derives from the MODTRAN 4 radiative transfer code,was introduced and explained.Then the FLAASH code was used to process MODIS data,and the NDVI after atmospheric correction was compared with that before correction.Results indicated that atmosphere's influences were reduced and useful information was enhanced.In the end,the ratio between Band2 and Band1 which was obtained by FLAASH atmospheric correction,was used to extract the cyanobacteria bloom information with the threshold.

Atmospheric correction of MODIS and its application in cyanobacteria bloom monitoring in Lake Taihu