LRS Edge Route Overlap

This feature class consists of approximately 640,000 features representing around 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). Only official VDOT route number routes are included in this feature service. For the network including street name routes, please use the official release map package here. Geometry and Attribution: The Linear Referencing System (LRS) data contained within this feature class provides route centerline geometry that is segmented at each intersection and supplies key descriptive attribution for each segment (i.e. edge) record. 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. In addition, local Virginia Geographic Information Network (VGIN) street names are attributed to each edge where possible. 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).本要素类包含约64万个要素，涵盖弗吉尼亚州境内约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部（Virginia Department of Transportation, VDOT）的官方道路台账源系统——道路台账管理系统（Roadway Inventory Management System, RIMS）构建。本要素服务仅纳入VDOT官方编号的道路路线，如需包含街道名称路线的数据集网络，请访问此处获取官方发布的地图数据包。几何与属性信息：本要素类中的线性参考系统数据提供了在每个交叉口处分段的路线中心线几何信息，并为每个分段（即边）记录提供关键描述性属性。本要素类还将重叠路线（例如I-64与I-95）表示为两个独立的共线要素，上下叠放。同时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主路线记录。此外，尽可能为每条边添加弗吉尼亚本地地理信息网络（Virginia Geographic Information Network, VGIN）的街道名称属性。度量基准：本线性参考系统基于由道路台账管理系统（RIMS）交叉口（即节点/枢纽）处的参考点推导得到的官方州里程（Official State Mileage, OSM）。