WMS Accident Atlas

Where do the data come from in the accident atlas? The accident atlas contains information from road accident statistics based on reports from police departments. In several federal states, the police do not or are not yet fully absorbing the geocoordinates of the accidents. The current issue contains the accident data of nine federal states. As soon as the geocoordinates of the accident sites in other federal states are available, the accident atlas will be updated.What exactly is a road accident? Road accidents are accidents in which people have been killed or injured as a result of driving on public roads and places or where property damage has occurred.The police are required to provide information on road accident statistics. Consequently, accidents to which the police have not been called are not included in the statistics. Data on accidents, participants, vehicles, accidents and causes of accidents are recorded.How are the accident data processed? The police also record the geographical coordinates of the accident location during the accident in many federal states. These accident coordinates are processed and then presented in the accident atlas.In order to make accident focal points visible in maps, individual accident events are summarised via road sections. For each section of the road it is determined how many accidents have occurred and the section is colored accordingly. By zooming on a road section, the individual accident sites at road level become visible again as points.In order to assign the accident coordinates to the correct road sections, the data must be plausible. The accident data is also compared with the road geometries of the official surveying administrations. In this way, not only the distance of the accident coordinate to a road section is assessed, but also whether the information on the road designation collected by the police departments (e.g. “B54”) and to the road class (highway, federal road, state road etc.) with the data of the survey administrations. The accident coordinate is then displayed as a point on the corresponding road section. Data that does not meet the requirements will be sorted out and not presented in the accident atlas. The rates for a successful assignment of an accident coordinate to a road section are usually well above 90 % in the individual federal states.How are the accident data shown in the accident atlas?Overview representations up to a map scale of 1:100,000 show the accident events only on motorways and federal roads. The length of the road sections on which the individual accident events are combined is usually five kilometers.From a scale of 1: 100,000 changes the view to a detailed view. Here, the streets of all classes are depicted. The length of the road sections is usually 250 meters. Smaller sections may occur near intersections or at the end of roads.The change from the overview to the detail view also changes the colouring of the individual sections of the road. Due to the smaller section lengths, the number of accident events per road section is also lower. If zoomed further into the map, from a scale of 1:50,000, the individual accident events will appear as points above the respective road section to which they were assigned.本事故图谱的数据来源为何？本事故图谱的数据源自基于警方报案记录的道路交通事故统计信息。在部分联邦州，警方尚未完全采集事故的地理坐标信息。当前版本的事故图谱收录了九个联邦州的事故数据。待其余联邦州的事故现场地理坐标信息完备后，本事故图谱将进行更新。道路交通事故的定义为何？道路交通事故指因在公共道路及公共区域内通行引发人员伤亡，或造成财产损失的事故。警方需提交道路交通事故统计相关信息，因此未接到警方出警的事故未被纳入统计范围。本次统计将收录事故基本信息、事故参与者情况、涉事车辆信息及事故成因相关数据。事故数据的处理流程如何？在多数联邦州，警方会同步记录事故发生地的地理坐标。此类事故坐标经处理后，将展示于事故图谱中。为在地图中清晰呈现事故高发区域，系统将通过道路路段对单笔事故进行汇总归类。针对每一段道路，系统将统计该路段内发生的事故总量，并据此为路段配置对应配色。当用户放大某一道路路段时，该路段上的单笔事故现场将以点位形式重新显现。为将事故坐标准确匹配至对应道路路段，需先验证数据的合理性。同时，系统会将事故数据与官方测绘管理部门提供的道路几何数据进行比对。通过该比对流程，不仅可评估事故坐标至目标道路路段的距离，还可校验警方采集的道路编号（例如"B54"）及道路等级（高速公路、联邦公路、州级公路等）信息是否与测绘部门的数据一致。经校验通过的事故坐标将以点位形式展示于对应道路路段上。不符合校验要求的数据将被剔除，不会展示于事故图谱中。在各联邦州，事故坐标成功匹配至对应道路路段的比例通常均高于90%。事故数据在事故图谱中的展示形式如何？当地图比例尺不大于1:100000时，概览视图仅展示高速公路及联邦公路上的事故事件。此时用于汇总单笔事故的道路路段长度通常为5公里。当比例尺达到1:100000时，视图将切换至详细模式，此时将展示所有等级的道路。该模式下的道路路段长度通常为250米，在交叉口附近或道路末端可能出现更短的路段。从概览视图切换至详细视图的同时，道路路段的配色规则也会随之调整。由于路段长度缩短，单路段内的事故事件数量也会相应减少。当用户进一步放大地图至比例尺大于1:50000时，单笔事故事件将以点位形式展示于其匹配的对应道路路段上方。