LST - Daytime PUG Zones

This is an aggregation of surface temperature (LST) data made by crossing the data relating to the PUG Zones and the Land Surface Temperature layer of the daytime flight of Sunday 16 July 2023. This processing represents a mere statistical-spatial aggregation made on a snapshot of the temperature data, on a given day (16 July 2023) and at a given time (14-15 flight time). The LST data is available and downloadable or usable through QGIS as an HTTP/HTTPS raster at the URL https://sit.comune.fe.it/raster/Termiche/20230716_giorno/LandSurfaceTemperature_Ferrara_day_mosaic_COG.tif - The dataset was obtained by processing the Zone PUG layer by intersecting the layer (PUG_1=’via’, originally unique) with the census sections in order to obtain separate polygons to more correctly distribute the temperature value over the road areas. The LST thermal image was filtered using the Raster Calculator function to eliminate pixels with temperature outliers (<20°) and then the Zone Statistics function calculated the mean, median and maximum values for each PUG zone. Symbolism was represented in 3 classes (for natural breaks / Jenks): less than 46°, between 46° and 54°, more than 54°本数据集为地表温度（Land Surface Temperature, LST）聚合数据集，通过将PUG分区相关数据与2023年7月16日周日日间航摄获取的地表温度图层进行空间叠加融合得到。本次处理仅针对2023年7月16日当日14时至15时航摄时段的温度快照数据开展统计空间聚合操作。该地表温度数据可通过QGIS以HTTP/HTTPS栅格格式获取、下载或调用，访问链接为：https://sit.comune.fe.it/raster/Termiche/20230716_giorno/LandSurfaceTemperature_Ferrara_day_mosaic_COG.tif。本数据集的生成流程如下：首先将原始唯一标识为“PUG_1=via”的图层与普查街区图层进行空间相交运算，得到独立多边形以更精准地将温度值分配至道路区域；随后通过栅格计算器（Raster Calculator）工具对地表温度热影像进行滤波处理，剔除温度低于20℃的异常像素；最后通过分区统计（Zonal Statistics）工具计算每个PUG分区的平均温度、中位温度与最高温度。最终采用3个类别进行符号化表达（基于Jenks自然断点法）：低于46℃、46℃至54℃区间、高于54℃。