摘要：Retrieved LST is validated with ground measurements, which are often performed over large, flat, and relatively homogeneous test sites to avoid uncertainty due to spatial heterogeneity [9,10]. However, the accuracy of LSTs retrieved from heterogeneous or mixed pixels remains questionable. Moran et al. (1997) evaluated uncertainty in LSTs due to heterogeneity. LSTs were up scaled from airborne data using two aggregation schemes for a semiarid rangeland. The average LST difference was less than 0.1 K, and the error due to emissivity differences was negligible for relatively homogeneous sites [11,12].
