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    沈阳市区土地利用类型与地表温度关系研究

    Study on the relationships between land use and land surface temperature in Shenyang urban districts

    • 摘要: 利用2010年8月Landsat TM数据计算沈阳市三环内地表温度(Land Surface Temperature,LST),基于目视解译与监督分类结合的方法将研究区划分为建筑用地、绿地、农田、弃地、道路和水体6类土地利用类型;以城市中心点为原点,分析城市中心不同距离圆环的LST及其与土地利用类型配置的关系,采用多元线性回归法和偏最小二乘回归法建立LST预测模型,并进行模型验证。结果表明:沈阳市区建筑用地、绿地、农田、道路和中心城区的平均LST均随着距中心原点的距离增加而减小;同一级别缓冲区内,建筑和道路的LST较高,水体的LST最低。城市的“摊饼”式发展,也造成了增强热岛效应的建筑用地和道路面积百分比随着距中心原点距离的增加逐渐降低。研究区范围内最主要的土地利用类型为建筑用地,其次为道路。对比分析表明,多元线性回归法和偏最小二乘回归法建立的模型均能较好的预测LST,采用偏最小二乘回归方法对沈阳地区土地利用类型与LST进行回归分析效果更理想。

       

      Abstract: The relationships of land surface temperature (LST) with the land use types were analyzed in Shenyang urban districts.The analyzing processes are as follows.First,the LSTs of Shenyang urban districts and within the third ring road were calculated using Landsat TM data in August 2010.Then,the land use of the studying area were classified as building land,green land,farmland,abandoned land,road and water body six types using visual interpretation and supervised classification methods.Finally,the city center was regarded as an origin point,and the relationships between the land use types and the LSTs at different circles distancing from the origin point in the city were analyzed using multivariate linear regression and partial least-square regression methods.The corresponding modeling results were verified as well.The results show that the mean LSTs of building land,green land,farmland,and road and the central urban district decrease with the increasing of the distance from the city center origin point.At the same level within buffering zones,the LSTs of building land and road are higher,and that of water body is the lowest.The "booth pie" developing in a city makes that the percentage of building land and road areas gradually reduced with the increasing of the distance from the city center origin point.Both of building land and road enhance the heat island effect.The main land use types are building land in the studying area,followed by road.Both of multivariate linear regression and partial least square regression methods perform very well in predicting LST.Comparatively,the partial least square regression method is more ideal to analyze the relationships between land use and LST in Shenyang.

       

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