Inventory of landslides triggered by an extreme rainfall event in Marche-Umbria, Italy, on 15 September 2022

This paper describes the event landslide inventory map produced to record the ground effects of the extreme rainfall event that hit Umbria-Marche, central Italy, on 15th September 2022. The rainfall event hit an area of ~5,000 km², with peak rainfall intensities of 419 mm in 9 hours, an exceptionally intense rainfall for this area. The event generated widespread flooding also outside the area affected by rainfall. The rainfall event produced widespread landslides across an area of nearly 1,000 km². As a direct consequence of floods and landslides, many roads were interrupted and extensive damages were recorded to structures and infrastructures. The landslide inventory presented is the result of an extensive reconnaissance field survey covering a large neighbourhood of the area affected by the highest rainfall intensity. The inventory covers an area of 550 km² and includes 1,687 landslides, corresponding to an average density of about 3.1 landslides per square kilometre. Landslide size (Landslide Area, A_L in m²) is in the range ~1 m² &lt; A_L &lt; 5.7 × 10⁴ m². Overall, landslides cover an area of 1.1 km²,which represents 0.2% of the Area of Interest (AOI). In the final inventory, a total of 1,243 landslides were mapped as polygons directly in the field, whereas the remaining 444 landslides were mapped as points (i.e. without information on landslide area). After post-processing activities, 512 polygons were transformed into points because their area was below the threshold of 225 m². Therefore, in the final map, 731 landslides are represented as polygons and 956 as points, ~54% of which kept the value of the original area. This repository stores: A polygon shapefile of the AOI A polygon shapefile of the raw inventory A point shapefile of the raw inventory A polygon shapefile of the final inventory A point shapefile of the final inventory This dataset consistently supports the scale of 1:15 000. As a consequence, all polygons smaller than 225 m² (i.e. a square of 1 mm per side in the map) in the raw data polygon layer were transformed into points because their size was too small to be represented as polygons at 1:15000 scale. <br> <br>

本论文介绍了为记录2022年9月15日袭击意大利中部翁布里亚-马尔凯（Umbria-Marche）地区的极端降雨事件所引发的各类地面破坏效应而编制的事件型滑坡编目图。此次降雨事件影响范围约5000平方千米，9小时内最大降雨强度达419毫米，为该区域罕见的极端强降雨。该事件在近1000平方千米的范围内引发了大范围滑坡，还在降雨影响区域之外造成了大面积洪涝灾害。受洪涝与滑坡的直接影响，多条道路中断，各类建（构）筑物及基础设施均遭受了大规模损毁。

本次公开的滑坡编目基于针对强降雨核心影响区域开展的大范围野外踏勘调查编制而成。该编目覆盖面积550平方千米，共记录1687处滑坡，平均滑坡密度约为每平方千米3.1处。滑坡规模以滑坡面积A_L（单位：平方米）计，介于约1平方米至5.7×10⁴平方米之间。整体而言，所有滑坡的总面积达1.1平方千米，占研究关注区域（Area of Interest, AOI）总面积的0.2%。

在最终编目中，共有1243处滑坡通过野外直接测绘为多边形要素，剩余444处则以点要素形式记录（即未获取滑坡面积信息）。经后处理工作后，因面积低于225平方米的阈值，512个多边形要素被转换为点要素。因此，最终编目图中共有731处滑坡以多边形形式表示，956处以点要素形式表示，其中约54%的点要素保留了原始滑坡面积数据。

本数据集仓库包含以下文件：
1. 研究关注区域（Area of Interest, AOI）多边形形状文件（shapefile）
2. 原始滑坡编目多边形形状文件（shapefile）
3. 原始滑坡编目点要素形状文件（shapefile）
4. 最终滑坡编目多边形形状文件（shapefile）
5. 最终滑坡编目点要素形状文件（shapefile）

本数据集适配1:15000的制图比例尺。因此，原始多边形图层中所有面积小于225平方米（对应地图上边长为1毫米的正方形）的多边形要素，因尺寸过小无法在1:15000比例尺下以多边形形式有效表达，均被转换为点要素。