不同地物类型下Landsat-7 ETM+热红外波段反演亮度温度的比较研究

Study of comparing different land cover's brightness temperatures based on Landsat-7 ETM+ thermal infrared band

以火山、冰雪、海冰、沙漠等地物覆盖区为对象,研究不同地物类型下Landsat-7 ETM+热红外波段6H和6L亮度温度图像及其差值的统计属性与空间分布特征,表明不同地物类型下6H和6L图像反演的亮度温度存在一定差异。火山区6H和6L的亮度温度差值范围显著大于冰雪、海冰、沙漠等区域的亮度温度差值范围,较大差值出现在高亮度温度处;冰雪、海冰、沙漠等区域,地物单一,地面温度变化小,6H和6L亮度温度具有较好一致性;6H和6L亮度温度存在季节性差异。

Taking ground coverage areas of volcano, snow, sea ice , desert and other feature areas as the ob-jects, the brightness temperature images of the 6H and 6L of the Landsat - 7 ETM ＋ thermal infrared band of different land cover types are researched as well as temperature difference images by subtraction 6L＇s brightness temperatures from 6H＇s. Then differences of the spatial structure and statistical characteristics of brightness temperature images of different land cover types are analyzed, indicating that inversion images of brightness temperature of the 6H and 6L exist differences. 6H＇ s and 6L＇ s brightness temperature difference range of Volcano area is significant higher than that of ice, snow, sea ice, desert and other feature areas, and with a larger difference in higher brightness temperature; The land surface temperature of sea ice, snow, desert and other areas, where ground coverage areas are all with a single feature, changes a little, and their 6H＇ s and 6L＇s brightness temperature have a good consistency; Also, 6H＇s and 6L＇s brightness temperature exist sea-sonal differences.