 The paper compares three methods for accurately measuring land surface temperature, LST, from satellite imagery. The radiative transfer equation-based method was found to be most accurate, with a root mean square error, RMSC, of less than 1K. The split-window algorithm and single-channel method had moderate accuracy, with RMSC values of around 2K and 3K respectively. This article was authored by CLAU, Chu Linghua, and Zhou Zongwu.