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Recently, I try to make AC by SWIR for processing very high turbid inland lakes,such as TaiHu Lake in China.
However, a result with mostly NaN values(subseting as inland lakes zones) was showed when I using seads l2gen to make AC for MODIS Aqua, selecting -9 Multi-scattering of 2 band model selecting using Want et.al (2009) algorithm of aer_opt options in Processing Tabs.
I don't know why. Is that the saturation of the NIR and SWIR bands? Did someone suffer this problem?
One possibility is a failure of the NIR/SWIR switching. The switching is based
on a threshold derived from the a method that requires a valid 748nm retrieval.
If that fails, which can happen if 748nm is saturated, switching will fail.
If 748nm is saturated over Lake Taihu, you're probably looking at floating algae,
in which case even if there is a successful retrieval from the SWIR, it will be
If you have a priori knowledge of the aerosol type, you can simply choose a single aerosol model. You could also take an iterative approach, using valid aerosol retrievals in a first run to select the aerosol model to use in as second, fixed aerosol run (an approach described by Hu et al., 2000 http://dx.doi.org/10.1016/S0034-4257(00)00080-8).
Thank you again, sean. I will read more publications about AC over turbid waters like Hu et al.(2000).
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