This study assessed the cooling ranges of small greenspaces (SGs) along the edges of surrounding areas and identified the spatial cooling distance threshold. Five SGs in a natural preserved public area located in College Station, Texas, USA, and a reference site (Rf) were selected for this study. Air temperature data collection took six rounds from fall to early summer. In each round air temperature was collected three times during a day (i.e., 10 h, 13 h, and 16 h). Temperature sensing units (TVCs) and loggers recorded air temperature every second via a transect survey. The cooling distance was determined according to each SG’s radius: (1) the centroid of the SG (GC), (2) the edge of the SG (GE), (3) 1.25 times the radius away from the GC (1.25R), and (4) 1.5 times the radius away from the GC (1.5R). Our findings showed the SGs’ cooling effect (∆T_Rf−i) surpassed their edges in general. The cooling degrees at the GC were higher and dropped continuously from the GE to 1.25R ending with 1.5R showing the lowest. In fall, the SGs’ mean cooling degree exceeded 9.24% at 1.5R compared to Rf. In early summer, the SGs’ mean cooling effects decreased significantly while showing a very small difference between the measurement points. Our findings contribute to uncovering some specific design features with SGs to cooling down cities by applying advanced technology. Our findings will help designers, planners, researchers, and local government officials by providing an optimal landscape planning and design guide for mitigating urban heat.

本研究评估了沿周围区域边缘的小型绿地 (SG) 的冷却范围，并确定了空间冷却距离阈值。本研究选择了位于美国德克萨斯州大学城的一个自然保护公共区域中的五个 SG 和一个参考站点 (Rf)。从秋季到初夏，气温数据收集共进行了六轮。在每一轮中，一天中的空气温度收集 3 次（即 10 小时、13 小时和 16 小时）。温度传感单元 (TVC) 和记录仪通过横断面调查每秒记录一次气温。冷却距离根据每个 SG 的半径确定：(1) SG 的质心 (GC)，(2) SG 的边缘 (GE)，(3) 距 GC 的半径 (1.25R) 的 1.25 倍, (4) 距离 GC 半径的 1.5 倍 (1.5R)。我们的研究结果表明 SGs 的冷却效果（∆T _{Rf− i} ) 总体上超过了它们的边缘。GC 处的冷却度更高，并从 GE 连续下降到 1.25R，最后以 1.5R 显示最低。在秋季，与 Rf 相比，SG 在 1.5R 时的平均冷却度超过 9.24%。在初夏，SGs 的平均冷却效果显着下降，但在测量点之间显示出非常小的差异。我们的研究结果有助于揭示 SG 的一些特定设计特征，通过应用先进技术为城市降温。我们的研究结果将通过提供最佳景观规划和设计指南来缓解城市热量，从而帮助设计师、规划师、研究人员和当地政府官员。