Roads

City of Cambridge, MA, GIS basemap development project encompasses the land area of City of Cambridge with a 200-foot fringe surrounding the area and Charles River shoreline towards Boston. The basemap data was developed at 1" = 40' mapping scale using digital photogrammetric techniques. Planimetric features; both man-made and natural features like vegetation, rivers have been depicted. These features are important to all GIS/mapping applications and publication. A set of data layers such as Buildings, Roads, Rivers, Utility structures, 1 ft interval contours are developed and represented in the geodatabase. The features are labeled and coded in order to represent specific feature class for thematic representation and topology between the features is maintained for an accurate representation at the 1:40 mapping scale for both publication and analysis. The basemap data has been developed using procedures designed to produce data to the National Standard for Spatial Data Accuracy (NSSDA) and is intended for use at 1" = 40 ' mapping scale. Where applicable, the vertical datum is NAVD1988. Explore all our data on the Cambridge GIS Data Dictionary. Attributes Name Type Details Description TYPE type: String width: 50 precision: 0 Type of road (paved, unpaved, alley, traffic island, ect) EditDate type: String width: 4 precision: 0 GRADE type: String width: 50 precision: 0 created_date type: Date width: 8 precision: 0 last_edited_date type: Date width: 8 precision: 0马萨诸塞州剑桥市GIS底图（GIS basemap）开发项目覆盖范围涵盖剑桥市全域、周边200英尺缓冲带以及朝向波士顿的查尔斯河河岸区域。本底图数据以1英寸=40英尺的制图比例尺，采用数字摄影测量技术构建完成。 项目已绘制涵盖人工地物与自然地物的平面要素，例如植被、河流等。此类要素可适配所有GIS/制图应用及出版物制作需求。团队开发了多组数据图层，包括建筑物、道路、河流、公用设施构筑物、1英尺间隔等高线，并将其存储于地理数据库（geodatabase）中。 所有要素均完成标注与编码，以区分特定要素类别用于专题可视化；同时维护要素间的拓扑关系，可在1英寸=40英尺的制图比例尺下实现精准的出版与分析展示。本底图数据依照《空间数据精度国家标准（National Standard for Spatial Data Accuracy, NSSDA）》制定的流程开发，适用比例尺为1英寸=40英尺。若有相关需求，垂直基准面采用NAVD1988（北美垂直基准面1988）。 可通过剑桥GIS数据字典浏览本项目全部数据集。 ### 属性详情 | 属性名称 | 数据类型 | 详细参数 | 描述 | | ---- | ---- | ---- | ---- | | TYPE | 字符串（String） | 宽度50，精度0 | 道路类型（铺装路面、非铺装路面、小巷、交通岛等） | | EditDate | 字符串（String） | 宽度4，精度0 | 无 | | GRADE | 字符串（String） | 宽度50，精度0 | 无 | | created_date | 日期（Date） | 宽度8，精度0 | 无 | | last_edited_date | 日期（Date） | 宽度8，精度0 | 无 |