Thermal infrared emissivity spectrum and its characteristics of natural surface objects in coalfield fires area

The Fourier transform infrared spectrometer was used to measure the emissivity of natural surface objects in Shuixigou coalfield fires area of Xinjiang.The smooth spectral iterative method was used to separate the temperature and emissivity,and the accurate temperature and emissivity of the surface objects were obtained.The thermal infrared emissivity spectral characteristics of seven typical types natural surface objects were analyzed,and five ASTER thermal infrared bands were selected to conduct the data simulation.The results show that:① The characteristics of thermal infrared emissivity spectrum show distinct differences in wavelength range of 8 ~ 13 μm,especially in 8.5 ~ 10,11.3 and 12 ~ 13 μm.Therefore these bands can be used as identifying characteristics of different bands;② Emissivity spectrum shows a characteristic difference at five ASTER thermal infrared bands,it is practically useful in the process of using remote sensing images to extract information for surface objects in coalfield fires areas;③ The emissivity can provide surface temperature retrieval with a precise parameter,so as to improve precision of temperature retrieval.