LRS Route Overlap

This feature class consists of approximately 507,000 features representing over 70,000 miles of Interstate, Primary, Secondary and Urban roads throughout the State of Virginia. The Linear Referencing System is based on the Virginia Department of Transportation's Source System of Record for road inventory, Roadway Inventory Management System (RIMS). Geometry and Attribution: The Linear Referencing System (LRS) data contained within this feature class provides dissolved route segmentation (i.e. routes are not segmented when they intersect other routes), thus rendering one table record per route. In cases where routes are noncontiguous (e.g. a valid physical gap exists), multi-part geometry is created. The feature class also depicts overlapping routes (e.g. Interstate 64 and Interstate 95) as two separate collinear features, one on top of the other. Routes built in the prime and non-prime directions are included. Each road centerline record has a master route record assigned. This feature class is best suited for labeling roadways when overlap reference is needed. Measures: The linear reference is based on Official State Mileage (OSM) as derived from reference points at Roadway Inventory Management System (RIMS) roadway intersections (i.e. nodes/junctions). Purpose: This linear referenced data layer represents roadways that are maintained by the Virginia Department of Transportation and provides the underlying spatially enabled geometric network to which all "events" (e.g. potholes, pavement type, vehicle accidents, traffic counts, culverts, etc...) can be located.本要素类（Feature Class）包含约50.7万个要素，涵盖弗吉尼亚州全境超过7万英里的州际公路、主干道、次干道及城市道路。其线性参考系统（Linear Referencing System, LRS）基于弗吉尼亚州交通运输厅（Virginia Department of Transportation, VDOT）的官方道路清单源系统——道路清单管理系统（Roadway Inventory Management System, RIMS）构建。 几何与属性信息：本要素类内的线性参考系统数据采用溶解式路线分段方式（即路线与其他路线相交时不进行分段），因此每条路线仅对应一条表记录。当路线不连续（例如存在合法的物理间隙）时，将创建多部分几何图形。本要素类同时会将共线的重叠路线（例如64号州际公路与95号州际公路）表示为两个独立的共线要素，上下堆叠显示。本数据集包含主方向与非主方向构建的路线，每条道路中心线记录均分配有一条主路线记录。该要素类最适用于需要进行重叠参考的道路标注场景。 度量基准：该线性参考基于官方州里程（Official State Mileage, OSM），其数据来源于道路清单管理系统（RIMS）道路交叉口（即节点/枢纽）处的参考点。 应用场景：该线性参考数据图层用于表示由弗吉尼亚州交通运输厅维护的道路，并提供启用空间功能的底层几何网络，所有“事件”数据（例如路面坑槽、路面类型、交通事故、交通流量、涵洞等）均可挂载至该网络上进行空间定位。