江门市区冬季地表热环境与土地覆盖类型关系的研究

Relationship between land surface thermal environment and cover types in Jiangmen city during winter

应用美国陆地资源卫星Landsat ETM+影像资料,反演了江门市区的地表温度(LST),并提取研究区的NDVI、NDBI和MNDWI指数。分析了江门市区冬季LST的空间分布特征及城市地表热环境与土地覆盖类型之间的关系。结果表明:江门市区LST分布具有空间差异性,不同土地覆盖类型有较大差异,存在城市热岛效应;LST与3种归一化指数存在相关性,其中LST与NDVI存在非线性相关、与NDBI存在线性正相关、与MNDWI存在线性负相关。

Applying Landsat ETM＋ image data of U.S. land resource satellites, the land surface temperature （LST） of Jiangmen city was achieved by inversion, and the NDVI, NDBI and MNDWI indices on that area were extracted. The LST＇s spatial distribution of Jiangrnen city during winter was analyzed, and the relationship between land surface thermal environment and cover types of that area was studied. The results were showing as follows. There are spatial differentials for the distribution of LST of Jiangmen city. For different land cover types, LSTs are quite different, of Jiangmen city. The urban heat island effect exist as well. There are correlations between LST and three kinds of normalized difference indices. In which, LST and NDVI are nonlinear correlated. LST has linear positive correlation with NDBI and linear negative correlation with MNDWI.