We've recently fixed an issue affecting brightness temperature values for Landsat 9 OLI-TIRS Level 1 data, specifically applied to bands 10 and 11.

Previously, the brightness temperatures were derived using the radiance multiplicative scaling factor, radiance additive scaling factor and thermal constants (K1 and K2) from Landsat 8 instead of Landsat 9. This led to small, but noticeable differences in the temperature values, typically by a few degrees.

The correction has now been applied, so you should see more accurate brightness temperature values moving forward.

Thank you for your understanding!