基于Landsat-8的煤火监测方法研究

Study on the method of coal fire monitoring based on Landsat-8 data

为了监测乌达矿区煤火的变化趋势,减少因煤自燃引起的经济损失,根据landsat-8卫星影像数据采用辐射传输方程法,单窗算法,劈窗算法等反演了内蒙古乌达矿区的地表温度,提取了煤火信息,并结合内蒙古乌达市环境监测中心站提供的数据和实地考察,验证地表反演结果的有效性。结果表明:几种反演算法得到的结果与地下煤火区地表温度的空间分布一致,其中劈窗算法综合考虑了两个热红外波段,其反演结果与实测温度值的差值较小,约为0.5℃,与地面实测值一致性比较好,高温异常区范围明显,在地下煤火反演中具有一定的适用性。

To monitor the development trend of coal fire in Wuda mining area and reduce the economic losses caused by spontaneous coal combustion,based on landsat-8 satellite image data,the land surface temperature of Wuda mining area in Inner Mongolia was inverted and the coal fire information was extracted by means of the radiation-transferequation method,the single-window-inversion algorithm,and the split window algorithm,etc. Combined with on-thespot investigation and the data provided by Environmental Monitoring Center of Wuda City,the effectiveness of land surface inversion outcomes was verified. The results show that： the outcomes deduced from above mentioned three inversion algorithms are consistent with the spatial distribution of surface temperature above underground coal fire area.Moreover,the outcomes of the split window algorithm,which takes two thermal infrared bands into account,are more consistent with the actual measured temperatures,the deviation is only 0. 5 ℃,and the boundary of abnormal high temperature area can be shown distinctly,so it has certain applicability in the inversion of underground coal fire.