Hyperspectral analysis of IR data from a background scene

摘要

The Swedish Defence Research Agency (FOI) has performed systematic measurements on a background scene over a period of one year, and established an IR-background database. It has, and will, be used for a wide range of applications and provide a basis for the modeling of IR-background properties of Swedish terrain. The database consists of traditional IR images and hyperspectral IR images, as well as weather data from the measurements. The major part of this paper describes the analysis of the hyperspectral data that was collected with the FTIR based ScanSpec system. In this paper the degree of greybody behavior from objects in the background have been studied in the LWIR and MWIR spectral regions. The analysis has been performed for seven different surfaces of the scene for different times of the day and different days of the year. The paper describes the method of the analysis, some results and attempts to find explanations to the observed phenomena. It is found that the background mainly behaves as greybodies and that the most important reason for deviations is the reflected sunlight. Among the studied surfaces asphalt shows the most obvious deviation from greybody behavior.