Building Footprints

Definition

  • The extent of a building in 2 dimensional space

  • Includes a unique identifier and other information derived from LIDAR (e.g. max height)

Illustration

  • On left: Oblique view of Green St facing north between Columbus and Powell ( Imagery: © 2017 Google; Left Panel Map Data: © 2017 Google)

  • On right: building footprints for the same block

Authority

  • SFGIS in the Department of Technology manages data collection and processing from LIDAR

    • LIDAR data is provided by a third-party and is updated every ???

    • From this data, SFGIS derives the footprints and assigns unique identifiers as well as additional derived statistics about the building (e.g. min, max and median height)

  • Information about buildings is captured by other departments including Building Inspection, SF Environment, SF Planning and the City's Real Estate Division among others.

    • Building footprints do not include administrative data about a building

    • They can be related to administrative data spatially and via unique identifiers

Use

  • To relate other administrative records to a structure

  • To clarify among administrative datasets what specific structure is being referenced

  • To improve the addressing model so that address numbers reference a building, not just a parcel

Accepted values

  • Footprints are not currently updated as new buildings are constructed

  • For those buildings constructed before 2010, you can use the unique identifier sf16_bldgid

Reference Datasets

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