DP Street Centre Line (OpenData)

This entity is derived as a copy of the StreetCentreLine feature allowing for the assignment of Road Hierarchies as published in the District Plan. These road hierarchies may be different that the road hierarchies set in the StreetCentreLine model as the District Plan only differentiates between the following hierarchies: Collector, Major Arterial, Minor Arterial, Central City Local Distributor, Central City Main Distributor and Local Road. By default, all roads are considered Local Roads, but a Plan Change is required to legally define a road as any other hierarchy. This entity can initially be updated using stored procedure CCC.uspUpdatedrvDPStreetCentreLine. This will add new roads, update any of the attributes inherited from the StreetCentreLine feature (e.g. StreetCentreLineID, ServiceStatus and Shape), and delete any features that no longer exist in source table. To this end, this model has an additional Legal Status, two Plan Change identifiers reserved for road changes, as well as a customized trigger to allow updates of SHAPE and ServiceStatus for operative features. Any changes to road hierarchies are to be updated manually and can follow the normal editing guidelines. It is spatially abstracted to a Line that is segmented at each intersection (for example Colombo Street is comprised of many segments) and may also be artifically segmented for Uturn bays or to resolve number range discrepancies. Entity Type: Concept.

此实体源自StreetCentreLine要素（StreetCentreLine）的副本，可用于分配《地区规划》（District Plan）中公布的道路等级（Road Hierarchies）。该道路等级可能与StreetCentreLine模型中预设的道路等级存在差异，因《地区规划》仅对以下等级进行区分：集散道（Collector）、主要干道（Major Arterial）、次要干道（Minor Arterial）、中心城区本地分流道（Central City Local Distributor）、中心城区主分流道（Central City Main Distributor）以及本地道路（Local Road）。默认情况下，所有道路均归类为本地道路（Local Road），但若要将某条道路合法定义为其他等级，则需进行规划变更（Plan Change）。该实体初始可通过存储过程CCC.uspUpdatedrvDPStreetCentreLine进行更新。此操作可新增道路、更新从StreetCentreLine要素继承的所有属性（例如StreetCentreLineID、服务状态（ServiceStatus）及几何形状（Shape）），并删除源数据表中已不存在的要素。为此，该模型额外增设了合法状态（Legal Status）、两个用于道路变更的规划变更标识符，并定制了触发器，以支持对有效要素的几何形状（SHAPE）及服务状态（ServiceStatus）进行更新。所有道路等级的变更均需手动完成，且可遵循常规编辑规范进行操作。该实体在空间上被抽象为折线，在每个交叉口处进行分段（例如科伦坡街（Colombo Street）由多个线段组成），也可出于掉头湾（U-turn bay）设置或解决编号范围差异的目的进行人工分段。实体类型：概念（Concept）。