Sentinel 2 S2A_MSIL2A open in SNAP and export as GeoTIFF

[marpet]

Such a value is not common, but you always have outliers.
And check this post of @OHagolle and also the link to the blog he posted. This shows that reflectance values can be above 1.

TOA Range in Sentinel-2 Images between 0 an 1?

Dear Daniel, it is not true reflectances are between zero and one : physics allow to observe reflectances above 1 Of course the total irradiance reflected by a surface in all directions is lower that the incoming sun irradiance, which means that the integral of reflectance in all directions is lower than one. But the reflectance may be higher than one in a particular direction. For instance, a window roof that reflects the sun right in the eye of Sentinel-2 can have a reflectance much higher …