城市地表典型遥感参数与热岛效应时空分析研究——以桂林市为例

利用桂林市1991年和2013年的卫星遥感影像数据,分别提取两个时期的归一化建筑指数(NDBI)、归一化植被指数(NDVI)和改进的归一化差异水体指数(MNDWI)3个地表典型参数,并利用回归分析方法,分析了3个地表典型参数与利用Landsat卫星(热红外波段)反演的地表温度(LST)的相关关系。研究结果表明:桂林市中、高、极高温区3个温度类别的变化趋势与桂林市城市扩张趋势基本一致;NDBI与LST成显著的正相关关系,而NDVI、MNDWI则与LST成负相关关系,且各参数对地表温度响应的程度各有差异。该研究成果对于揭示桂林市热岛效应现状、缓解热岛效应及推进桂林市生态城市建设具有一定的参考意义。

Spatial-temporal Analysis of Urban Heat Island Effect and the Typical Surface Parameters Variation:Case Study of Guilin

Abstar ct:In this paper, the three typical surface parameters such as normalized difference build-up index (NDBI), normalized difference vegetation index ( NDVI) and modified normalized difference water index ( MNDWI) were extracted from the remote sensing images in1991 and 2013 of Guilin.And the method of regression analysis was used to analysis the pertinence between the two phases of typical parameters and the land surface temperature quantitatively.The result shows:The change trend of medium, high, very high temperature zoon in three categories of Guilin is consistent with the trend of the expansion of Guilin′s city construction;the land sur-face temperature is positively correlated with NDBI but negatively correlate with NDVI and MNDWI, and all the surface parameter have different effect on the land surface temperature.The result of this study will have a certain reference value to reveal the present situa-tion of Guilin city heat island′s effect, remit its harm and promote the construction of ecological city of Guilin.