Landsat C2L2 ST Band & QA File

ST Band

单位转换，如图：

; ST band：Scaled Kelvin to Kelvin
gain=0.00341802
offset=149.0

LST=LST*gain + offset

Surface Temperature QA File

首先讲一下什么是ST QA Bands：
The ST QA file indicates uncertainty about the temperatures given in the ST band file. The ST QA file is generated using uncertainty values and distance to cloud values. Higher numbers indicate greater uncertainty. This file is not included in the product when an SR-only product is generated. The GDAL_NODATA tag defines the value of -9999 to be the no data value for this band.

单位转换，如图：

; ST QA band to Kelvin
QA = QA * 0.01
 

参考：

https://www.usgs.gov/media/files/landsat-7-etm-collection-2-level-2-data-format-control-book
https://zhuanlan.zhihu.com/p/364850569