 The study compares Landsat-8 derived land-surface temperature, LST, with ground-level temperature, GLT, measured using i-button registered trademark symbol Thermocrown registered trademark symbol temperature sensors in Worcester, Massachusetts, USA to determine the capability of Landsat-8 thermal infrared scanner, TIRS, to measure fine-scale temperature variation in a moderately sized urban area with a mixture of land cover types. The study finds that site characteristics and land cover type affect the offset between in-situ air temperature measurements and satellite-derived LST, with sites having more tree canopy coverage showing a more consistent relationship between LST and GLT. This article was authored by A. Elms, M. Healy, N. Geron, and others.