Research on the temperature retrieval algorithms of coal spontaneous combustion based on DEM

In order to analyze the changes and distribution of coal fire in wuda area, three different remote sensing temperature retrieval algorithms such as Single-window algorithm, Single-channel algorithm and Artis algorithm were applied, it was extracted coal fire temperature of Wuda coal field with mutli-threshold density slice method in 2005 and compared with the vector diagram of the field work. But it was obtained the similar overlapping with the at-sensor brightness temperature. The Artis algorithm obtained the lowest results. Single-window algorithm and Single-channel algorithm has the same coverage. However, it should be the best choice for the direct application of the at-sensor brightness temperature, where it obtained the same overlapping. Analyzed the distribution of land cover and Digital Elevation Model(DEM) in Wuda, it show that the high temperature abnormality in North and the low temperature abnormality were related with the land cover and topographic change in Wuda coal field. It was the 60% overlapping in the less interference of north area. Finally, taking the 11th coal fire area as the studying example and comparing the temporal and spatial variation from 2005 to 2012, it was conclusion that the coal fire temperature anomaly area was fluctuation from 2005 to 2010, and the range of coal fire reduced after 2010 because the coal fire was controlled and not increased.