基于Landsat 7的武汉市热岛效应研究

Studies Based on the Urban Heat Island of Landsat 7-Take the City of Wuhan as an Example

城市化使得城市数量和规模不断增加,城市作为人类对自然环境改造最为剧烈的部分,具有独特的区域环境,其中城市内部温度显著高于周边郊区的热岛效应是一个突出的城市环境问题,受到了普遍关注和研究。武汉市是长江中游特大城市,城市热岛效应明显,但对其研究很少。利用Landsat TM6波段数据,生成武汉市城市亮温场,分析了武汉市热场的分布、大小,利用亮温场均值、方差和相对温度评价城市热岛强度,并对城市热场的范围及强度变化与城市发展规模及方向进行了分析,取得了较好的效果。

Urbanization enables the number and the scale of cities to ever-increase,cites as one of which be transformed most dramatic by human beings has a unique regional environment,in which the internal temperature of the city is significantly higher than the outskirts of urban.It has been a prominent environmental problem named heat island effect and attracted extensive attention and studies.Wuhan is a super city with prominent urban heat island effective in middle reach of Changjiang River,but very little studies for it.The generation of the urban brightness temperature field of Wuhan and the analysis of the distribution and the size of the heat field is by using the Landsat TM6-band data.The mean,variance and relative temperature of brightness temperature field can be used to appraise the intensity of urban heat island and to analysis the scope and intensity change of urban thermal field and the scale and direction of urban development,which achieve good results.