This polygon feature contains geographic and attribute information for the purpose of depicting the shape and orientation of the ground floor of all structures within the City of SeaTac, Washington. This information is typically compiled from orthoimagery or other aerial photography sources. This representation of the building footprints supports the City’s basemaps. It also serves as a source for public works, public safety, planning and other agencies that are responsible for the active management of site addresses, facilities, and land use information. Building height information was calculated from 2016 LIDAR data to be used as a starting point for 3D modeling, and has been refined in a few target areas, but is mostly unverified.