山地城市坡向对地表温度的影响--以重庆市主城区为例
首发时间:2012-08-08
摘要:以典型的山地城市重庆市主城区为例,利用ArcGIS空间分析功能,提取各坡向上由TM影像反演的地表温度,并在SPSS中进行方差分析。结果发现,东南和南坡向的地表温度较高,而西北和北坡向的地表温度较低,各坡向的平均地表温度与该坡向所占的面积高度一致;在8坡向分类和16坡向分类情况下,各坡向的平均地表温度有显著的差异;针对同一种用地类型,各坡向的平均地表温度没有显著差异。不同的用地类型引起的城市建设强度和生产生活活动差异是形成地表温度变化的主要因素,而坡向对地表温度的影响相对强烈的城市工人建设环境效应而言是比较弱的。
关键词: 环境生态 坡向 地表温度 方差分析 山地城市 重庆市
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Influence of aspect on land surface temperature in mountainous city: a case study in central area of Chongqing city
Abstract:Taking Chongqing main city proper, a typical mountain city, as an example, Land Surface Temperatures (LSTs) derived from TM images are extracted in each aspect class using spatial analysis function in ArcGIS software, and are analyzed by the method of Analysis of Variance (ANOVA) in SPSS software. The results show that LSTs in southeast aspect and south aspect are high, on the contrary LSTs in northwest aspect and north aspect are low. The average LST in each aspect class is highly consistent with the land area in the aspect class. The average LST in each aspect class is significant different, if the aspect is divided into 8 classes or 16 classes. However, the average LST in each aspect class is no significant different in a same land cover/use type. The LST change in city is mainly caused by urban construction, and production and living activities differences due to different types of land cover/use, while the influence of aspect on LST is relatively weak comparing with strong environmental effects resulted from high-intensity and large-scale urban construction activities.
Keywords: Environmental Ecology Aspect Land Surface Temperature Analysis of Variance (ANOVA) Mountainous City Chongqing City
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