The failure of using SWIR atmospheric correction method for Landsat 8 image

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liugers11
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Joined: Fri Mar 01, 2013 2:08 pm America/New_York

The failure of using SWIR atmospheric correction method for Landsat 8 image

by liugers11 » Thu Mar 23, 2017 4:31 am America/New_York

Hi,
      I try to use the SWIR method for the atmospheric correction of Landsat 8 image.
            The set is "aer_opt=-2 aer_rrs_long=-1.0 aer_rrs_short=-1.0 aer_swir_long=-1  aer_swir_short=-1 aer_wave_long=2201 aer_wave_short=1609"
            I have  cancelled all the  mask:
                The set is   "MASKLAND=0 maskbath=0 MASKCLOUD=0 maskglint=0 masksunzen=0 masksatzen=0 maskhilt=0 maskstlight=0"
            and  also set the "tauamax =2.0".
     
      However, the atmospheric correction still failed.
      Does it because the high latitude or solar zenith angle ?
      The latitude of the study area is nearly 50°N and the solar zenith angle is nearly 40°. I have tried many times but the retrieved Rrs_nnn or AOT_nnn are "NaN".
The water of my study area is clear. So I think it met the hypothesis of SWIR method. Thank you very  much.
Best Wishes
Ge

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OB.DAAC - SeanBailey
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The failure of using SWIR atmospheric correction method for Landsat 8 image

by OB.DAAC - SeanBailey » Sat Mar 25, 2017 11:32 am America/New_York

It is very likely not due to the geometries, but more information is needed to diagnose the issue.  To aid you in identifying why the retrievals fail, look at the l2_flags to see which are set.
Did you try the defaults?  You may also want to try processing with a fixed aerosol, a white aerosol or no aerosol correction. 

Sean

liugers11
Posts: 18
Joined: Fri Mar 01, 2013 2:08 pm America/New_York

The failure of using SWIR atmospheric correction method for Landsat 8 image

by liugers11 » Sun Apr 23, 2017 9:41 pm America/New_York

Hi, Sean
       
       Sorry for relying so late.  I collected in situ data in the last month.
       I have found the solution. It needs to set "proc_ocean=2". The extraction rule of OLI in SeaDAS is too strict for these turbid lakes.
       Thank you very much.

Best Wishes
Ge

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