Curbs

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 curb EditDate type: String width: 4 precision: 0 GRADE type: String width: 50 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，覆盖范围包含剑桥市全域、周边200英尺缓冲区及朝向波士顿的查尔斯河（Charles River）岸线区域。本底图数据采用1英寸=40英尺的制图比例尺，通过数字摄影测量技术制作完成。
底图已绘制平面地物要素（Planimetric features），涵盖人工地物与自然地物，包括植被、河流等各类地理要素。此类要素可广泛应用于各类GIS/制图项目及出版物中。项目已构建多组数据图层，包括建筑物、道路、河流、市政设施、1英尺间隔等高线等，并存储于地理数据库（geodatabase）中。
所有要素均已完成标注与编码，以实现专题可视化所需的特定要素类别表达；同时维护要素间的拓扑关系，确保在1:40制图比例尺下的精准表达，满足出版与空间分析需求。
本底图数据遵循国家空间数据精度标准（National Standard for Spatial Data Accuracy，NSSDA）开发制作，适用制图比例尺为1英寸=40英尺。在适用场景下，垂直基准面采用1988北美垂直基准面（North American Vertical Datum 1988，NAVD1988）。
可访问剑桥市GIS数据词典查看全部数据集内容。
属性表结构说明如下：
| 字段名称 | 数据类型 | 详细参数 | 字段描述 |
| ---- | ---- | ---- | ---- |
| TYPE | 字符串 | 宽度50，精度0 | 路缘类型 |
| EditDate | 字符串 | 宽度4，精度0 | 无额外说明 |
| GRADE | 字符串 | 宽度50，精度0 | 无额外说明