Street Simple

Simple Streets provide a simplified network of federal, state, county and municipal and private roads mapping purposes. All public roads should be represented in the database as well as many of the private roads that are open to the general public. A private section of pavement that serves less than three households is generally considered a private drive and is not included in this set. The features are intended to represent the driving surfaces of the roads, and are often near the center of the road pavement, however, this varies by feature. Where the pavement is divided by a median or raised divider of more than 50', a separate feature represents the pavement in each direction (a dual carriageway representation). The center of physical roadway pavement may or may not represent the center of the road right of way. Road right of ways may taper or change width. There has been no attempt to alter the road centerline to conform to right of way that is not parallel or alters in width. The features from the full dataset have been merged to reduce the number of segments making this data set appropriate for rapid cartographic display, but not for geocoding, routing, or other functions supported by the full dataset.Simple Streets 数据集是面向制图需求构建的简化道路网络，涵盖联邦、州、县级市政道路及私人道路。该数据库需收录全部公共道路，以及众多面向公众开放的私人道路。仅服务不足3户家庭的私人路面区段，通常被归类为私人车道，不会被纳入本数据集。本数据集的地理要素旨在表征道路行车路面，通常位于道路路面中心附近，但具体位置因要素而异。当路面被宽度超过50英尺的中央分隔带或凸起式隔离设施分隔时，将分别为双向路面各创建一个要素（即双向分离式车道表征方式）。实际道路路面的中心点，未必与道路用地红线的中心点重合。道路用地红线可能会收窄或宽度发生变化，本数据集未对道路中心线进行调整，以使其与不平行或宽度发生变化的道路用地红线相匹配。本数据集通过合并完整数据集的地理要素以减少路段数量，因此仅适用于快速制图展示，而不适用于地理编码、路径规划等完整数据集所支持的其他功能。