verified the results of atmospheric correction for Sentinel 2 MSI at two AERONET-OC sites

[tululu132465]

I have verified the results of atmospheric correction for Sentinel 2 MSI at two AERONET-OC sites using the default mode in Acolite. I examined the benefits of using SWIR for atmospheric corrections and found that contrary to my understanding, using shortwave does not improve the accuracy of the atmospheric corrections.I don't know where things went wrong.
I removed shortwave by setting dsf_exclude_bands=10,11,12

[quinten]

Hi Sidney

The current defaults for S2 already exclude the SWIR bands by the default dsf_wave_range=400,900 for MSI. If you do a run with dsf_wave_range=400,2500 you can include the SWIR to evaluate this impact. (Make sure to remove your dsf_exclude_bands setting if you want to try this!)

We are looking into taking into account SWIR noise to improve the correction when the bands are used.

I hope this helps!

Quinten

[tululu132465]

Hi Quinten

Thanks for your reply, I'll try it. However, the bands determined by dsf_exclude_bands setting do not participate in dark pixel selection and AOT. I am wondering whether it will have an impact on the results of atmospheric correction. Thank you again, I will try it.

Sidney

[quinten]

Hi Sidney

Your setting of dsf_exclude_bands=10,11,12 had no effect since the default for MSI is to use only bands in the range 400-900 nm as set by dsf_wave_range=400,900. So running either of the following setting combinations would have the same effect:

Code: Select all

dsf_exclude_bands=10,11,12

Code: Select all

dsf_wave_range=400,900

Code: Select all

dsf_exclude_bands=10,11,12
dsf_wave_range=400,900

To run with SWIR you need to edit the dsf_wave_range and not exclude any bands, for example:

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dsf_exclude_bands=None
dsf_wave_range=400,2500

I hope this is more clear!

Quinten

[tululu132465]

Hi Quinten
Thank you, this helped me a lot.