With the global population on the rise, our cities have been expanding to
accommodate the growing number of people. The expansion of cities generally
leads to the engulfment of peripheral areas. However, such expansion of urban
areas is likely to cause increment in areas with increased land surface
temperature (LST). By considering each summer as a data point, we form LST
multi-year time-series and cluster it to obtain spatio-temporal pattern. We
observe several interesting phenomena from these patterns, e.g., some clusters
show reasonable similarity to the built-up area, whereas the locations with
high temporal variation are seen more in the peripheral areas. Furthermore, the
LST center of mass shifts over the years for cities with development activities
tilted towards a direction. We conduct the above-mentioned studies for three
different cities in three different continents.

城市扩张导致了周边地区的淹没，而这种城市区域的扩张很可能导致土地表面温度增加。通过考虑每年夏季作为一个数据点，我们形成土地表面温度多年时间序列并进行聚类以获取时空模式。从这些模式中，我们观察到一些有趣的现象，如一些聚类与建筑区域具有合理的相似性，而具有高时空变化的位置更多地出现在周边地区。此外，城市发展活动倾向于某个方向，而土地表面温度的质心随着时间的推移也会发生变化。我们对三个不同大洲的三个城市进行了上述研究。