I have a sentinel 2 L1C data and I am trying to calculate the Land Surface Water Index (LSWI) using the NIR and SWIR bands. As the Sentinel 2 data is having 2 SWIR bands (B11 and B12), I am confused about which one to use for LSWI calculation
You want bands compatible with MODIS bands B02 (841-875 nm) and B06 (1628-1652 nm).
Check out the Sentinel-2 specification SENTINEL-2 Radiometric Resolutions to find:
- Band 08A: Narrow Near InfraRed (848 ~ 880 nm)
- Band 11: SWIR (1540 ~ 1685 nm)
So the band combination becomes
(B08A - B11) / (B08A + B11).
Band 12 range (2070 ~ 2340 nm) is far off for your requirement.