Spatio-temporal Characteristics of Urban Heat Island Effect of Xi′an City Based on Landsat TM/ETM+

Su Ya-li; Zhang Yan-fang

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Spatio-temporal Characteristics of Urban Heat Island Effect of Xi′an City Based on Landsat TM/ETM+

- Spatio-temporal Characteristics of Urban Heat Island Effect of Xi′an City Based on Landsat TM/ETM+
- Bulletin of Soiland Water Conservation Vol. 30, Issue 5, Pages: 230-234(2011)
- 作者机构：
  
  陕西师范大学旅游与环境学院
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- Published：2011
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Su Ya-li, Zhang Yan-fang. Spatio-temporal Characteristics of Urban Heat Island Effect of Xi′an City Based on Landsat TM/ETM+[J]. Bulletin of Soiland Water Conservation, 2011, 30(5): 230-234.
DOI：

Su Ya-li, Zhang Yan-fang. Spatio-temporal Characteristics of Urban Heat Island Effect of Xi′an City Based on Landsat TM/ETM+[J]. Bulletin of Soiland Water Conservation, 2011, 30(5): 230-234. DOI：

摘要

为了对西安市城市热岛时空演变特征进行研究

以1990

2002

2007年三景LandsatTM/ETM+遥感影像为数据基础

分别反演出1990

2002

2007年西安市亮度温度

并对其进行极值归一化处理。将处理结果分为6个等级

对比分析西安市3个时期的城市热岛比例指数(URI)。通过分析归一化植被指数(NDVI)与城市热岛效应的关系进一步研究了植被覆盖对城市热岛效应的影响。结果表明:(1)1990—2007年

西安市城市热岛比例指数不断上升

西安市城市热岛效应逐年增强;(2)1990—2007年

西安市城市热岛效应呈现出散点状—片状—连片状的空间形态变化特征

并由莲湖区、新城区、雁塔区、碑林区向未央区、灞桥区扩散;(3)NDVI与城市热岛效应呈负相关性

适当增加城市绿地对于缓解城市热岛效应具有积极作用。

Abstract

To study spatio-temporal characteristics of urban heat island effect of Xi′an City

the study inverted brightness temperatures of three time periods based on three Landsat TM/ETM+images of 1990

2002 and 2007

which were then normalized and scaled into six grades to calculate urban-heat-island ratio index (URI).The impacts of vegetation on urban heat island were further discussed through the relationship between NDVI values and urban heat islands.The results show that URI increased and the effects of urban heat island were strengthened in Xi′an City from 1990to 2007.During this period

the urban heat islands evolved from scattered spots to flakes

and then to connected flakes

and the distribution of urban heat island approached from the districts of Lianhu

Xincheng

Yanta

Beilin to the districts of Weiyang and Baqiao. The NDVI values were negatively correlated with urban heat island.Appropriately increasing urban green areas might be able to reduce significantly the urban heat island effect

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Related Author

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Related Institution

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