The HLS 30 m Sentinel-2 surface reflectance is derived from MSI L1C data, resampled to 30 m, normalized to nadir view, and for the Landsat/Sentinel-2 command bands, bandpass adjusted with Landsat-8 as the reference.
- Spatial: 30 m
- Spectral: OLI-like spectral response for V-NIR-SWIR bands, and original MSI for NIR B08 and Red-edge bands
- temporal: All Sentinel-2 L1C granules
- Nadir view adjustment: Yes
Sentinel-2 surface reflectance in the Landsat/Sentinel-2 common bands is adjusted for spectral difference between the two sensors. The spectral response of Sentinel-2 is adjusted to that of Landsat, except for the NIR B08 and Red-Edge bands. The spectral adjustment is a band-to-band linear regression between the command bands (see the following Table for the band matchup).
|Band name||OLI band number||equivalent MSI band number|
Spatial resampling algorithm
The resampling methods are different with input spatial resolution:
- MSI 10 m bands are resampled to 30 m with simple average,
- MSI 20 m bands are resampled to 30 m with area-weighted average,
- MSI 60 m bands are replicated to the 30 m pixels that are nested within.
Each data layer is saved in a separate Cloud Optimized GeoTIFF (COG) file. File naming follows a format:
HLS.S30.T<Tile_ID>.<year><doy>T<HHMMSS>.v<version number>.< Band>.tif
Data layer description
The table below gives a quick description of the layers included in the product.
|Band Name||Data type||Scale||Unit||saturation flag||Spatial
|Bandpass adj.||BRDF adj.|
|QA||int8||30||refer to the QA table in the User’s Guide for the bit information|