Landsat 8 processing: Atmospherically correction and LAI calculations

[marpet]

The result of C2RCC will not help you for computing LAI.
C2RCC gives you only values over water, the land is masked out.
The swir band is not used by C2RCC. That’s why it is not in the output.
Here it is explained why:

C2RCC L8/S2 Corrected Bands

Hi Katerina, Sentinel-2: Band 7 is provided in the rhow bands. Band 8 is a very broad band and thus less suitable for water retrieval than Band8A (which is included). The C2RCC algorithm is not workging with the SWIR bands. Thus, Bands 8, 11 and 12 are not provided as water leaving reflectance bands (7 and 8A should be in the products). For Landsat-8 it is the same with the SWIR Bands. The SWIR bands are not included in the training of the NN for the AC, thus they are not included as atmospher…

So, it is better to use the above suggested icor atmospheric correction.

Your final goal is to have one product containing a time series of LAI?
Then you should first do the icor processing (it needs the original inputs) afterwards you can resample and compute LAI. In a last step you can collocate all LAI products.

For doing the batch processing with gpt there exists a little guide which explains how to do it.
Bulk Processing with GPT - SNAP - SNAP Wiki (atlassian.net)