摘要
应用定量遥感揭示武汉市热岛强度在不同季节和不同年份的时空格局演变。首先,选取2002年(1月,3月,7月,10月)及2000年,2004年,2010年7景ETM数据反演地表温度;其次,经热岛强度指数归一化地温数据,使数据间更具可对比性。对比2002年不同季节地温反演数据,分析武汉市热岛强度在不同季节的变化情况及形成原因。比较2000年,2004年,2010年三个不同年份地温数据,探讨热岛强度年际时空格局演变,建立LST与ndvi、城市热岛强度与水域面积间的相关关系,分析武汉市城区多年ndvi均值以及水域面积的时间变化趋势。结果显示:武汉市城市热岛强度存在明显的季节差异;年际热岛强度空间演变格局表现为以沿江地带为中心,以西北和东南两个方向为主向外延展;LST同ndvi呈负相关关系,其中ndvi值下降0.1,则地表温度上升约1.4℃;热岛强度同城市内水域面积大小亦呈负相关;对比分析了城区多年植被覆盖及水体面积变化趋势,总结出绿地等植被覆盖面积逐渐减小及湖泊面积逐步萎缩是造成武汉城市热岛强度增强的主要因素。
Based on quantitative remote sensing technology to reveal the Wuhan urban heat island effect in different season and years. First, select the 4 View （2002. 1, 3, 7, 10, ） and 3 View （2000, 2004, 2010） ETM data inversion of land surface temperatures. Then, through heat island intensity index to data normalization, making more of the comparability of data. Compare 2002 4 （ 1,3, 7, 10） View image analysis Wuhan City heat island intensity in different seasons change and the reason for seasonal differences. Through 3 View（2000,2004,2010）ETM images to analysis on Spatial and Temporal variation, and also establish the correlation between the LST and ndvi, heat island intensity and water area ,to analysis change trend for ndvi mean, and the water area of many years for Wu- han city. The result indicates that Wuhan Urban Heat Island Intensity have showed significant seasonal variation. The spatial and tem- poral variation of Wuhan Urban Heat Island Intensity is that along rivers, mainly to the northwest and southeast directions scale - out. LST and NDVI showed a negative correlation between NDVI values decreased by 0.1, the surface temperature increased by about 1. 4℃ ,also negatively related to the heat island intensity the same city water area size. Comparative analysis of the trend of years of urban vegetation cover and water area summed up the green vegetation coverage area gradually reduced and shrinking of the lake area is the main factors for Wuhan urban heat island intensity enhanced.
出处
《测绘与空间地理信息》
2014年第12期113-117,共5页
Geomatics & Spatial Information Technology
关键词
定量遥感
热岛强度
季节变化
年际演变
quantitative remote sensing
heat island intensity
seasonal variation
decade change
NDVI
