 This research uses remote sensing technology to reveal human heat stress within continuous space, showing that discomfort index, DI, can be derived from remotely sensed data and its spatial distribution can be affected by relative humidity. The study also highlights the limitations of land surface temperature, LSD, as a widely utilized indicator of surface thermal condition in addressing human heat stress as environmental factors such as relative humidity are not taken into account. This article was authored by Yang Song and Chongshan Wu.