昆明主城区土地覆盖时空分布及地表温度响应

Spatio-temporal Distribution Characters of Land Covers and its Relationship with Land Surface Temperature in the Main Urban Area of Kunming

利用SVM、决策树及辐射传导方程,基于Landsat TM/OLI、DEM数据分别提取2000、2005、2010、2015年昆明主城区的土地覆盖类型以及地表温度信息,并进一步分析土地覆盖类型与地表温度时空变化的关系。研究表明:2000-2015年昆明主城区各土地覆盖类型面积的变化特征表现为建设用地增加最多、森林次之,水体基本不变,农田、裸地大幅减少;建设用地与其他土地覆盖类型之间的相对温差不断扩大;城市地表温度的第一正相关因素为建设用地,第一负相关因素为水体。

The main urban area of Kunming,Yunnan China was selected as the study area.First,land cover types and land surface temperature of the study area in 2000,2005,2010,and 2015 were separately extracted from Landsat TM/OLI remote sensing images and DEM data based on SVM,decision tree,and radiative transfer equation.Then the spatio-temporal distribution relationship between land cover types and the land surface temperature were analyzed.The results showed several rules in the study area from 2000 to 2015: the increased area of the built-up lands was the most among five land cover types(built-up land,forests,farm land,water,and bare land),and the forest is the second;the waterbody area was relative stable;and the area of farm land and bare land were substantially decreased.The temperature difference of built-up land and the other land cover types increasingly enlarged;the first positive and negative correlation factors of land surface temperature were built-up land and waterbody separately.