Extreme heat is the leading cause of heat-related mortality around the world. Extracting heat vulnerability information from the urban complexity system is crucial for urban health studies. Using heat vulnerability index (HVI) is the most common approach for urban planners to locate the places with high vulnerability for intervention and protection. Previous studies have demonstrated that HVI can play a vital role in determining which areas are at risk of heat-related deaths. Both equal weight approach (EWA) and principal component analysis (PCA) are the conventional methods to aggregate indicators to HVI. However, seldom studies have compared the differences between these two approaches in estimating HVI. In this paper, we evaluated the HVIs in Hangzhou in 2013, employing EWA and PCA, and assessed the accuracies of these two HVIs by using heat-related deaths. Our results show that both HVI maps showed that areas with high vulnerability are located in the central area while those with low vulnerability are located in the suburban area. The comparison between HVI_EWA and HVI_PCA shows significantly different spatial distributions, which is caused by the various weight factors in EWA and PCA. The relationship between HVI_EWA and heat-related deaths performs better than the relationship between HVI_PCA and deaths, implying EWA could be a better method to evaluate heat vulnerability than PCA. The HVI_EWA can provide a spatial distribution of heat vulnerability at intracity to direct heat adaptation and emergency capacity planning.

中文翻译：

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通过两种方法比较绘制杭州市极端热的城市热脆弱性。

极热是世界范围内与热相关的死亡率的主要原因。从城市复杂性系统中提取热脆弱性信息对于城市健康研究至关重要。对于城市规划人员来说，使用热脆弱性指数（HVI）是找到干预和保护脆弱性高的地方的最常用方法。先前的研究表明，HVI在确定哪些地区存在与热相关的死亡风险中起着至关重要的作用。等权重法（EWA）和主成分分析（PCA）都是将指标汇总到HVI的常规方法。但是，很少有研究在估计HVI时比较这两种方法之间的差异。在本文中，我们采用EWA和PCA对2013年杭州的HVI进行了评估，并通过与热有关的死亡评估了这两个HVI的准确性。我们的结果表明，两个HVI地图都显示，脆弱性较高的区域位于中心区域，而脆弱性较低的区域则位于郊区。HVI之间的比较_EWA和HVI _PCA显示出明显不同的空间分布，这是由EWA和PCA中的各种权重因子引起的。HVI _EWA与热相关死亡之间的关系要好于HVI _PCA与死亡之间的关系，这意味着与_PCA相比，EWA可能是评估热脆弱性的更好方法。HVI _EWA可以在城市内部提供热脆弱性的空间分布，以指导热适应和应急能力规划。