基于Landsat 8影像的公园地表温度与植被指数时空变化特征研究--以武汉市青山公园为例

Study of Temporal-spatial Change Characteristics of Park Surface Temperature and Vegetation Index Based on Landsat 8 Images—A Case of Qingshan Park in Wuhan City

[目的]研究城市公园对环境温度的调节作用以及地表温度与植被覆盖的关系。[方法]以武汉市青山公园为研究对象,通过2013、2015、2018年夏季3期Landsat 8遥感影像反演出地表温度和归一化植被指数(NDVI),利用ArcGIS软件提取公园绿地对应的地理信息数据,对地表温度和NDVI的时空变化特征及相关性进行分析。[结果]2013—2018年青山公园NDVI从0.30下降至0.25,地表温度分级中温区减少,低温区和高温区增加,且地表温度和NDVI呈现出明显的负相关,其中2018年最为明显,回归函数为y=-17.229x+34.107(R^(2)=0.5605)。[结论]该研究为武汉及其他城市绿地规划管理提供理论依据。

[Objective]To study the regulating effect of urban parks on environmental temperature and the relationship between surface temperature and vegetation coverage.[Method]Taking Qingshan Park in Wuhan City as the research object,through the inversion of surface temperature and normalized vegetation index(NDVI)from Landsat 8 remote sensing images in the summer of 2013,2015 and 2018,ArcGIS spatial analysis software was used to extract the corresponding data of park green space.The temporal-spatial change characteristics and correlation of land surface temperature and NDVI were analyzed.[Result]During 2013-2018,NDVI in Qingshan Park decreased from 0.30 to 0.25,the middle temperature area of land surface temperature classification decreased,while the low temperature area and high temperature area increased,and land surface temperature and NDVI showed significant negative correlation.Among them,2018 was the most obvious,the regression function was y=-17.229x+34.107(R^(2)=0.5605).[Conclusion]The study provides a theoretical basis for the planning and management of green space in Wuhan and other cities.