Building Footprints

Building structures include parking garages, ruins, monuments, and buildings under construction along with residential, commercial, industrial, apartment, townhouses, duplexes, etc. Buildings equal to or larger than 9.29 square meters (100 square feet) are captured. Buildings are delineated around the roof line showing the building "footprint." Roof breaks and rooflines, such as between individual residences in row houses or separate spaces in office structures, are captured to partition building footprints. This includes capturing all sheds, garages, or other non-addressable buildings over 100 square feet throughout the city. Atriums, courtyards, and other “holes” in buildings created as part of demarcating the building outline are not part of the building capture. This includes construction trailers greater than 100 square feet. Memorials are delineated around a roof line showing the building "footprint."Bleachers are delineated around the base of connected sets of bleachers. Parking Garages are delineated at the perimeter of the parking garage including ramps. Parking garages sharing a common boundary with linear features must have the common segment captured once. A parking garage is only attributed as such if there is rooftop parking. Not all rooftop parking is a parking garage, however. There are structures that only have rooftop parking but serve as a business. Those are captured as buildings. Fountains are delineated around the base of fountain structures.本数据集涵盖的建筑结构包括停车场（parking garages）、废墟、纪念性建筑（monuments）、在建建筑，以及住宅建筑、商业建筑、工业建筑、公寓楼、联排别墅（townhouses）、双联住宅（duplexes）等各类建筑。仅采集面积大于或等于9.29平方米（即100平方英尺）的建筑。建筑轮廓沿屋顶边线进行勾勒，以呈现建筑的占地面积（footprint）。屋顶断点与屋顶边线（例如联排住宅中各户之间、办公建筑内部独立空间之间的屋顶分界）均会被采集，用于拆分建筑占地面积轮廓。本数据集同时采集全市范围内所有面积超过100平方英尺的棚屋、车库及其他无地址标识的建筑。建筑内部的中庭、庭院及其他用于划定建筑轮廓的“镂空区域”，不计入建筑采集范围。面积超过100平方英尺的施工临时用房也纳入采集范畴。纪念性建筑同样沿屋顶边线勾勒其占地面积轮廓。看台（bleachers）沿连片看台的基座进行轮廓勾勒。停车场（parking garages）沿其外围边界（含坡道区域）进行轮廓勾勒。若停车场与线性地物共享边界，则该公共边界段仅需采集一次。仅当停车场设有屋顶停车场时，方可被标注为“停车场（parking garages）”。但并非所有带屋顶停车场的建筑都属于停车场范畴。部分建筑仅设有屋顶停车场，但实际作为商业用途，此类建筑将按普通建筑进行采集。喷泉（fountains）沿喷泉结构的基座进行轮廓勾勒。