Sidewalks

All public walkways are captured. Sidewalks do not overlap other feature classes unless they are hidden under a bridge or overpass. Cement pads around public swimming pools are captured. Walkways in common areas of apartments, college campuses, and business parks are captured as sidewalks. Individual resident sidewalks are not captured. Sidewalk: Sidewalks either compiled photogrammetrically as polygons or derived from a combination of vectors including: curbs, buildings, walls, driveways, or other features. Any stair feature that is less than 5 stairs is coded as sidewalk to maintain continuity. Hidden Sidewalk: Sidewalks that are obscured by overpasses or tunnels. They are not fully visible in an aerial photograph, but the location can be interpreted based on the information visible on either side of the bridge. Stairs: Groups of 5 or more stairs outside of major buildings or monuments, as well as part of sidewalks. Individual stairs are not captured. If landings exist within stairs, they are captured as sidewalk, not stairs. Crosswalk: Marked crosswalks that are fully visible in an aerial photograph.所有公共步行通道均已纳入采集范围。人行道（Sidewalk）与其他要素类无重叠，除非其被桥梁或天桥遮蔽。公共泳池周边的水泥平台均已纳入采集范围。公寓、大学校园及商业园区公共区域内的步行通道均按人行道标准采集，居民个人专属步行道不予采集。 人行道（Sidewalk）定义：通过摄影测量方式采集为多边形要素，或由路缘、建筑、墙体、车道及其他要素的矢量数据组合衍生得到。为保持要素连续性，台阶数量少于5级的台阶要素将被归类为人行道。 遮蔽人行道（Hidden Sidewalk）定义：被天桥或隧道遮蔽的人行道。此类区域在航空影像中无法完全显现，但可通过桥梁两侧可见信息推断其位置。 台阶（Stairs）定义：大型建筑或纪念性建筑外部的5级及以上台阶组，以及作为人行道组成部分的台阶。单个台阶不予采集；若台阶间设有踏步平台，则平台按人行道而非台阶标准采集。 人行横道（Crosswalk）定义：航空影像中完全可见的带标记人行横道。