Google Earth Engine - problem using math functions

Question

I am using Landsat 8 C2L2 images, and I would like to multiply Band 10 with 0.00341802 and then add 149.0 in order to get land surface temperature in Kelvin (this is explained by the second image from USGS). The problem which I face is the following:

1. I create a "var surface_temperature" which is equal to Band 10.

2. I multiply this var with 0.00341802, and in the end I add 149.0.

3. The final LST range is 140 to 372 Kelvin which is not possible.

What's wrong with my code? Code's Link: https://code.earthengine.google.com/334f43b02a4861d7c7fb7c2a77154fd1

Answer 1

If you check the histogram you'll see that the data are in the proper range. Likely there are a couple of erroneous pixels that are stretching the range. The dataset includes the 'ST_QA' band which you could use to mask out pixels that have high uncertainty.

print(ui.Chart.image.histogram(lst, geometry, 30))