Modeling the TOA Brightness Temperature on the SWIR-Sensors

Creation of maps of surface temperature distribution based on satellite imagery data is becoming increasingly important throughout the past decade and is relevant for a number of studies. This paper presents the values of the coefficients and expressions for calculating the brightness temperature on the SWIR sensors of Landsat-8, Sentinel-2A/B and WorldView-3, nearest to the TIR-range. Two methods for modeling the brightness temperature on SWIR sensors, which have some similarity in values with TIR-temperature data, are considered. In experiments on the test multispectral data, a spread of temperatures of up to 20 K was obtained for certain types of ground cover. In this study, the first method, based on control points for certain types of surfaces, yielded a result with a smaller spread of values (no more than 2 K for certain types of surfaces). The second method was based on the use of multispectral indices for improving the accuracy of simulation results.