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Multi-scale remote sensing estimates of urban fractions and road widths for regional models

机译：区域模型的城市比例和道路宽度的多尺度遥感估计

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Landuse in East Asia has changed substantially during the last three decades, featured with expansion of urban built-up at unprecedented scale and speed. The fast expansion of urban areas could contribute to local and even regional climate change. However, current spatial datasets of urban fractions do not well represent the extent and expansion of urban areas in the regions, and that best available satellite data and remote sensing techniques have not been well applied to serve regional modeling of urbanization impacts on near surface temperature and other climate variables. Better estimates of localized urban fractions are badly needed. Here we use high and mid resolution satellite data to estimate urban fractions and road width at local and regional scales. With our fractional cover, data fusion, and differentiated threshold approaches, more spatial details of urban cover are demonstrated than previously reported in many global datasets. Many city clusters were merging into each other, with gradual blurring of boundaries and disappearance of gaps among member cities. Cities and towns were more connected with roads and commercial corridors, while wildland and urban green areas have become more isolated as patches among built-up areas. Average road width in commercial areas was 37.2 m in Beijing (north, temperate) and 24.2 m in Guangzhou (south, tropical), which are greater than these listed in model default values. Those new estimates could effectively improve climate simulation at local and regional scales in East Asia.
机译：在过去的三十年中，东亚的土地利用发生了巨大变化，其特征是城市建设以前所未有的规模和速度扩张。城市地区的快速扩张可能会导致当地乃至地区的气候变化。但是，当前城市片段的空间数据集不能很好地代表该地区城市区域的范围和扩展，并且最好的可用卫星数据和遥感技术还没有很好地应用于服务于城市化对近地表温度和温度影响的区域模拟。其他气候变量。迫切需要对局部城市比例进行更好的估算。在这里，我们使用高分辨率和中分辨率的卫星数据来估计局部和区域范围内的城市比例和道路宽度。通过我们的分数覆盖，数据融合和差异化阈值方法，与许多全球数据集中以前报道的相比，展示了更多的城市覆盖空间细节。许多城市群正在相互融合，边界逐渐模糊，成员城市之间的鸿沟消失。城市和城镇与道路和商业走廊的联系更加紧密，而荒野和城市绿地则在建成区之间变得越来越孤立。北京（北部，温带）和广州（南部，热带）的商业区平均道路宽度分别为37.2 m和24.2 m，大于模型默认值中列出的宽度。这些新的估算可以有效地改善东亚地方和区域范围内的气候模拟。

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