Public Footpaths

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 footpath (paved or unpaved) EditDate type: String width: 4 precision: 0马萨诸塞州剑桥市地理信息系统（Geographic Information System, GIS）底图开发项目覆盖剑桥市全域、周边200英尺缓冲带以及面向波士顿的查尔斯河沿岸区域。本底图数据采用数字摄影测量技术，以1英寸=40英尺的制图比例尺生成。项目描绘了包含人工地物与自然地物（如植被、河流）在内的平面要素，此类要素对所有GIS/制图应用及出版物均具有重要价值。研发了建筑、道路、河流、市政设施、1英尺间隔等高线等多组数据图层，并存储于地理数据库中。所有要素均经过标注与编码，以实现专题可视化所需的特定要素类表达；同时维护要素间的拓扑关系，确保在1英寸=40英尺的制图比例尺下实现精准的出版与分析效果。该底图数据遵循《国家空间数据精度标准》（National Standard for Spatial Data Accuracy, NSSDA）的开发流程制作，适用场景为1英寸=40英尺的制图比例尺。若适用，垂直基准面采用北美垂直基准面1988（North American Vertical Datum 1988, NAVD1988）。可通过剑桥GIS数据字典查询本项目全部数据。属性表详情如下： | 属性名称 | 类型 | 详情 | 描述 | | ---- | ---- | ---- | ---- | | TYPE | 字符串（String），宽度50，精度0 | 无 | 人行道路类型（铺装或非铺装） | | EditDate | 字符串（String），宽度4，精度0 | 无 | 编辑日期 |