基于多时相卫星影像的城市热岛效应遥感监测方法研究

Research on remote sensing monitoring method of urban heat island effects based on multi-temporal satellite images

随着城市化的快速发展,城市热岛效应越来越严重,本文采用2019夏季至2021年夏季的Landsat 8卫星影像,通过反演温度与旱情等指数监测热岛效应及多年变化情况。本研究得出以下结论:1)地表温度数据准确反映城市及周边耕地、山地实际温度;2)反演植被指数显示,山地和耕地农作物长势良好,VTCI与TVDI趋势一致;3)2021年热岛效应最严重,VTCI避免NDVI与LST异常值影响;4)旱情指数计算时,干湿边方程拟合效果良好,点位周边仅有少数离散状态点。这为相关监测研究提供了清晰有效的思路,并且研究结果可以为城市热岛现象的生态调控提供科学依据。

With the rapid development of urbanization,the urban heat island effect is becoming increasingly severe.This article uses Landsat 8 satellite images from the summers of 2019 to 2021 to monitor the heat island effect and its multi-year changes by inverting temperature and drought indices.This study draws the following conclusions:1)Surface temperature data accurately reflects the actual temperature of urban and surrounding farmland and mountainous areas;2)Inverted vegetation index shows that crops in mountainous and cultivated areas are growing well,with consistent VTCI and TVDI trends;3)The heat island effect is the most severe in 2021,and VTCI avoids the impact of NDVI and LST outliers;4)When calculating the drought index,the fitting effect of the dry wet edge equation is good,and there are only a few discrete state points around the points.This provides a clear and effective approach for relevant monitoring research,and the research results can provide scientific basis for the ecological regulation of urban heat island phenomena.