PROXIMAL REMOTE SENSING: POTENTIAL AND LIMITATIONS OF FT-IR SPECTROMETER FOR VALIDATION OF SATELLITE MEASUREMENTS

There are several methodologies to retrieve land surface temperature (LST) from thermal infrared (TIR) remote sensing data. All of them require validation with field measurements. However, it is difficult to perform ground measurements with the satellite overpass. We investigated the potential and limitations of FT-IR spectrometer for the validation of orbital remote sensing data in the thermal infrared region (TIR). Results indicated that laboratory measurements can be successfully replaced for field validation in the estimation of land surface emissivity (LSE) of quartz sand, avoiding the need of field campaign. In this case, it is essential to pay attention to some factors in the laboratory, such as the time required for the instrument to acquire stability and the calibration process.