Several methods are established for measuring two-dimensional horizontal velocity distribution for outdoor flow field. Yet, a method to measure the turbulent structure of 10~100 meter scale is lacking.TIV (Thermal Image Velocimetry), which is introduced in this paper is adequate to the range and has quantitatively measured dust devil like vortex and upward flow near the wall in the past researches. However, advection velocity of TIV and wind speed relation is not yet clarified. In this research, horizontal surface wind speed distribution in an outdoor artificial turf football field were estimated from a TIV observation experiment that took place during sunny daytime in Sep. 2013. Two dimensional horizontal advection speed vector estimated from thermal camera and wind speed measured by 5 sonic anemometers were compared for all 21 observation cases by 10 minute intervals.
