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I want to calculate NDMI (Normalized Difference Moisture Index) using Sentinel 2 bands on QGIS. I am not sure if right formula is B8-B11 or B8A - B11. Band 8 seems to give better results but on the other hand band 8A is reported more often in papers.
Is there any expert who can help?
The NDMI was designed to be used with wavelengths 820nm (NIR) and 1600nm (SWIR). Band 8 has a central Wavelength of 832.9nm and band 8A has 864.0nm (https://sentinel.esa.int/web/sentinel/missions/sentinel-2/instrument-payload/resolution-and-swath). Therefore, band number 8 looks like the most adequate.
The Index DataBase supports this choice as well: https://www.indexdatabase.de/db/i-single.php?id=56
