This work presents a prototype landslide early warning system (LEWS) adapted to real-time performance over the region of Catalonia (NE Spain). The system uses high-resolution rainfall information obtained from weather radar observations and susceptibility maps to issue a qualitative warning level at a regional scale. To study the influence of the mapping unit on the LEWS outputs, susceptibility maps obtained for Catalonia based on (i) pixels of different sizes and (ii) hydrological subbasins have been compared. The susceptibility has been derived using a simple fuzzy logic approach combining slope angle and land cover data. The susceptibility maps for the different mapping units have then been employed to run the LEWS for a period of 7 months (warm season of 2010). For each configuration, the performance, interpretability of the warnings, and computational requirements have been compared to assess the suitability of each mapping unit for their use in the LEWS in real time. The configuration using pixels of 30-m resolution as mapping units seems to be the best as a compromise between resolution, performance, and computational cost. However, from an end-user’s real-time perspective, the interpretation of the warnings can be difficult. Therefore, summarizing and visualizing the warnings, which are computed over the high-resolution grid, by subbasins is proposed as the best option.

中文翻译：

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区域滑坡预警系统制图单元的影响：加泰罗尼亚（西班牙东北部）像素和多边形的比较

这项工作展示了一个原型滑坡预警系统 (LEWS)，适用于加泰罗尼亚（西班牙东北部）地区的实时性能。该系统使用从天气雷达观测和敏感性图获得的高分辨率降雨信息，在区域范围内发布定性预警级别。为了研究制图单元对 LEWS 输出的影响，比较了基于 (i) 不同大小的像素和 (ii) 水文子流域为加泰罗尼亚获得的敏感性图。使用结合坡度角和土地覆盖数据的简单模糊逻辑方法得出了敏感性。然后使用不同制图单位的敏感性图来运行 7 个月的 LEWS（2010 年暖季）。对于每个配置，警告的性能、可解释性、和计算要求进行了比较，以实时评估每个映射单元在 LEWS 中使用的适用性。使用 30 米分辨率的像素作为映射单位的配置似乎是分辨率、性能和计算成本之间的最佳折衷方案。但是，从最终用户的实时角度来看，对警告的解释可能很困难。因此，建议将子流域在高分辨率网格上计算的警告汇总和可视化作为最佳选择。从最终用户的实时角度来看，警告的解释可能很困难。因此，建议将子流域在高分辨率网格上计算的警告汇总和可视化作为最佳选择。从最终用户的实时角度来看，对警告的解释可能很困难。因此，建议将子流域在高分辨率网格上计算的警告汇总和可视化作为最佳选择。