Determining the land surface temperature (LST) variations in urban surfaces using high spatiotemporal resolution thermal infrared data is necessary for urban microthermal environmental modeling. An unmanned aerial vehicle (UAV) equipped with a thermal infrared imager was used to monitor the high-precision spatiotemporal variation of LSTs for six typical urban surfaces, including water, tree canopy, grass, brick pavement, asphalt pavement, and marble pavement, in the Jiangning district, Nanjing. An estimation of sensible heat release was further conducted to quantitatively describe the fine characteristics of the LSTs of these surfaces. The factors influencing LST were investigated by correlating LSTs with the meteorological factors. The results showed that there were significant differences in LSTs and sensible heat release for six typical urban surfaces in sunny and cloudy days, respectively. On sunny days, the diurnal variations in different surfaces fluctuated substantially, which was not evident on cloudy days. The artificial surfaces always represented as the main source of sensible heat release. Solar radiation and air temperature, among the meteorological factors, were positively correlated with the LSTs of the surfaces. The air humidity was negatively correlated with the LSTs and played a role in cooling the land surface.

中文翻译：

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基于无人机热成像的城市地表温度详细变化探索

使用高时空分辨率热红外数据确定城市表面的地表温度 (LST) 变化对于城市微热环境建模是必要的。使用配备热红外成像仪的无人机（UAV）对水、树冠、草地、砖路面、沥青路面和大理石路面等六种典型城市表面的 LST 时空变化进行高精度监测。南京市江宁区。进一步进行显热释放的估计以定量描述这些表面的 LST 的精细特征。通过将LST与气象因素相关联，研究了影响LST的因素。结果表明，晴天和阴天6个典型城市地表的LSTs和显热释放量分别存在显着差异。晴天时不同地表的日变化波动较大，阴天不明显。人造表面总是作为显热释放的主要来源。在气象因素中，太阳辐射和气温与地表LSTs呈正相关。空气湿度与LSTs呈负相关，对地表起到降温作用。人造表面总是作为显热释放的主要来源。在气象因素中，太阳辐射和气温与地表的LSTs呈正相关。空气湿度与LSTs呈负相关，对地表起到降温作用。人造表面总是作为显热释放的主要来源。在气象因素中，太阳辐射和气温与地表LSTs呈正相关。空气湿度与LSTs呈负相关，对地表起到降温作用。