Quantifying Thermal Infra-Red directional anisotropy using Master and Landsat-8 simultaneous acquisitions

Satellite observations in the Thermal Infra-Red (TIR) domain provide valuable information on Land Surface Temperatures, Evapo-Transpiration and water use efficiency are useful for monitoring vegetation health, agricultural practices urban planning. By 2030, there will be 3 new high-resolution global coverage satellite TIR missions space, all of them with fields view larger than ± 30°. Directional anisotropy can affect estimation key application variables, such as temperature, typically studied by means field campaigns or physical modelling. In this work, we have evaluated directional effects using simultaneous measurements from Landsat-8 45°field MASTER airborne sensor NASA. Differences high 6 K observed surface temperatures derived these observations. Those differences attributed to effects, greatest associated hotspot conditions, where solar viewing directions align. Five well parametric models then been fitted temperature differences, allowing amplitude measured reduced below 1 K, small variations between models. These results suggest that a simple correction could implemented part ground segment processing upcoming missions.