The small differences between MSI and OLI equivalent spectral bands are adjusted. The OLI spectral bandpasses are used as the reference, to which the MSI spectral bands are adjusted. The bandpass adjustment is a linear transform between equivalent spectral bands. The slope and offset coefficients were computed from synthetic MSI and OLI bands convolved from 500 atmospherically corrected hyperspectral spectra selected on 160 globally distributed Hyperion scenes. MSI’s Relative Spectral Responses (RSRs) correspond to the version 2.0. The spectral differences between MSI onboard Sentinel-2A (S2A) and Sentinel-2B (S2B) are accounted for (Claverie 2023).
The table below shows coefficients of linear regression used to adjust Sentinel-2A/B MSI to Landsat 8/9 OLI.
| Sentinel-2A | Sentinel-2B | |||||
|---|---|---|---|---|---|---|
| HLS Band Name | OLI Band Name | MSI Band Name | Slope | Offset | Slope | Offset |
| CA | 1 | 1 | 0.9959 | -0.0002 | 0.9959 | -0.0002 |
| Blue | 2 | 2 | 0.9778 | -0.004 | 0.9778 | -0.004 |
| Green | 3 | 3 | 1.0053 | -0.0009 | 1.0075 | -0.0008 |
| Red | 4 | 4 | 0.9765 | 0.0009 | 0.9761 | 0.001 |
| NIR | 5 | 8A | 0.9983 | -0.0001 | 0.9966 | 0.000 |
| SWIR 1 | 6 | 11 | 0.9987 | -0.0011 | 1.000 | -0.0003 |
| SWIR 2 | 7 | 12 | 1.003 | -0.0012 | 0.9867 | 0.0004 |