北京市土地覆盖变化对地表温度的影响

Influence of Land Cover Change on Land Surface Temperature in Beijing

为研究北京市土地覆盖变化对地表温度的影响,选取1991年和2011年的Landsat-5专题制图仪影像,采用单窗算法和基于专家知识的决策树分类方法,提取期间地表温度和土地覆盖变化信息,分析了研究区20年来的土地覆盖变化对地表温度影响的空间分布格局和变化规律。研究结果表明:1991年到2011年间北京市土地覆盖类型的变化改变了地表温度的空间分布特征。在土地覆盖类型未发生变化的区域,6种土地利用类型的地表温度都升高,在土地覆盖类型发生变化的区域,地表温度有升有降,但总体上城市地表温度的空间分布与土地覆盖类型的空间变化格局存在明显的一致性。

In order to study influence of land cover change on land surface temperature( LST) in Beijing,the LST and land cover change information of Landsat-5 thematic mapper( TM) in 1991 and 2011 in Beijing were extracted based on the single window algorithm and decision tree classification using expert knowledge. The effects of the spatial distribution pattern and variation of land cover change on LST of the research area in 20years were analysed. Results show that change of land cover type alters spatial distribution characteristics of LST from 1991 to 2011. The LST of six land using types are increased in the not changed area,and in the changed region the LST rise and fall. On the whole the spatial distributions of LST are consistent with the spatial pattern of land cover types obviously.