Estimation of tropical forest canopy temperatures, thermal response numbers, and evapotranspiration using an aircraft-based thermal sensor

摘要: Thermal infrared Multispectral Scanner (TIMS) data were collected at a resolution of 5 to 10 m from tropical rain forest over an elevation gradient 35 2700 in the Braulio Carrillo National Park Costa Rica. Flight lines repeated with 15 30 minute time difference for measurement canopy thermal response time. Concurrent radiosonde measurements atmospheric profiles air temperature and moisture provided inputs LOWTRAN6 radiance corrections TIMS data. Techniques using calibrated aircraft-based scanner examine properties are described. Forest changes assessed between repeated, duplicated flight combined estimates surface radiative energy towers above determine spatial variability, calculate Response Numbers (TRN), estimate evapotranspiration along selected one hectare inventory plots.