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首页> 外文会议>International Congress on Image and Signal Processing >Spatio-temporal variations in urban heat islands effects of Nanjing, China derived from the dense Landsat imagery (1992–2011)
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Spatio-temporal variations in urban heat islands effects of Nanjing, China derived from the dense Landsat imagery (1992–2011)

机译：南京城市热岛的时空变化，南京源于茂密的土地图像（1992-2011）

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The magnitude and pattern of the urban heat island (UHI) effects have been major concerns of many urban climatology studies and land use planning programs. Taking Nanjing, China as the case study, based on the dense Landsat thermal observations (8 scenes) from 1992 to 2011, geometric correction and radiometric calibration were implemented to refine the thermal data, followed by the retrieval and mapping of the surface brightness temperatures. Via identifying a suite of PIFs (Pseudo-Invariant Features) in concert with 6 near simultaneous measurements collected from the local meteorological observatories, the ground truth temperatures maps were derived and normalized to make all the images comparable directly. Then, grading the heat island patterns was employed through a fixed brightness temperature mean and standard error to characterize the spatio-temporal variations in the UHI. Results suggested that conversions from large-scale low temperature and sub-low temperature areas into medium temperature and high temperature areas were frequently witnessed in Nanjing, and the expansion route of the heat islands mainly ran along north to south. The 1990's increase rates of the heat island areas were smaller than those in the 21st century and the peak values of the areas were observed in 2007 and 2011. The average intensity of the heat island remained relatively stable and the extreme temperatures varied greatly. The reasons responsible for the changes in spatio-temporal characteristics of the UHI were the sharp increase in impervious surfaces, increased use of fossil fuels and greening policies. Ultimately, increase in the naturally vegetated surfaces, effective control of urban air pollution, accelerating urban ventilation, strengthening environmental philosophy of the nationals were recommended as the countermeasures mitigating the heat island effects, which may enable the establishment of a harmonious, livable and low-carbon urban space for living.
机译：城市热岛（UHI）效应的幅度和模式是许多城市气候学研究和土地利用规划计划的主要问题。以南京为例研究，基于1992年至2011年的密集土地热观测（8场景），实现了几何校正和辐射校准，以优化热数据，然后检索表面亮度温度的检索和映射。通过在局部气象观察区收集的近同时测量的音乐会上识别PIFS（伪不变特征），导出和标准化地图实际温度图，以使所有图像直接相当。然后，通过固定亮度温度平均值和标准误差使用热岛图案的分级，以表征UHI的时空变化。结果表明，南京经常见证大规模低温和次低温区域的转化为中温和高温区域，热岛的膨胀路线主要沿着南北奔跑。 1990年代的热岛地区的增加率小于21世纪的速度，2007年和2011年观察到该地区的峰值。热岛的平均强度仍然相对稳定，极端温度变化很大。负责UHI的时空特征变化的原因是不透水表面的急剧增加，增加了化石燃料和绿化政策的使用。最终，增加了天然植被的表面，对城市空气污染的有效控制，加速城市通气，加强国民环境哲学，因为减轻了热岛效应的对策，这可能能够建立和谐，宜居和低碳城市的生活空间。

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