基于结构相似度的太谷县LST空间特征

Spatial Distribution Characteristics of LST in Taigu County Based on Structural Similarity

为研究地表温度(LST)在太谷县域内整体的变化规律和趋势,以Landsat8数据为基础,通过辐射传输方程计算地表温度,并利用结构相似度(SSIM)对LST空间结构及分布规律进行研究。结果表明:太谷县域内LST的空间结构特征具有明显的差异性且结构相似度对地形地貌和水热条件反应敏感,具体表现为西北平原区SSIM值高于东南山区且整体呈递减趋势。下垫面覆盖类型和人类活动在小范围内对结构相似度有一定影响,县城和过渡地带SSIM值较低,而平原耕地区域和水域SSIM值较高。引入图像结构信息的参量SSIM,可以具体描述太谷县域内LST的分布结构特征以及变化规律。

Based on the Landsat8 data,the land surface temperature（LST） was calculated by radiative transfer equation, and the spatial distribution characteristics and trends of land surface temperature（LST） in Taigu County were studied by SSIM. The results showed that the spatial distribution characteristics of LST had distinctive regional variations. The structural similarity of surface temperature was extremely sensitive to the reaction of topography and water and heat conditions. The SSIM of Northwest Plain was higher than that of Southeast Mountain. The types of underlying surface and human activities became the dominant factors in a small area. The SSIM of county town and transition zone was small,while that of cultivated area in plain and water area was high. The spatial distribution characteristics and trends of LST in Taigu County could be characterized by SSIM introduced parameters of image structure information.