基于TM影像的城市热岛效应和植被覆盖指数关系研究

Urban Heat Island Effect and Vegetation Cover Index Relation Using Landsat TM Image

通过对杭州市区ETM+遥感影像数据的处理,提取该区域地表亮温和NDVI数据,并结合实测温度对亮温数据的可靠性进行了验证。在亮温图的基础上,利用温度分级掩膜运算得出不同温度像元NDVI信息,同时对亮温数据进行了标准化处理,从而得到热岛强度和NDVI关系的散点图,然后利用监督分类、相关性矩阵及统计分析等方法,对关系数据进行了修改、验证及拟合,得出杭州市区热岛强度和NDVI之间的定量关系模型,修正判定系数达到0.88,较好地反映了该区域热岛效应和植被覆盖指数的关系,为杭州市城市规划、绿地规划等提供了较为可靠的理论依据。

The brightness temperature data, whose reliability is verified by the observed air temperature, and NDVI data of Hangzhou urban city was acquired from ETM＋ image. Then the scatter graph of Urban Heat Island Index-NDVI was developed by using the temperature-degraded mask form the brightness temperature map and normalization of brightness temperature. The quantitative relation model, which has a high adjusted R2 of 0.88, was simulated by using super-classification, correlation matrix and statistics tool based on the scatter graph, and can be used as relatively credible theory, in the city planning and urban green space system planning.