November 1, 2012 – this data is now public
The Countywide building outline dataset contains building outlines (over 3,000,000) for all buildings in Los Angeles County, including building height, building area, and the parcel number (also known as building footprints). This data was captured from stereo imagery as part of the LAR-IAC2 Project (2008 acquisition).
There are a number of sources, listed here:
- City of Palmdale – building outlines from the LAR-IAC (2006) imagery – derived from orthogonal imagery.
- City of Pasadena – building outlines from earlier imagery, updated with LAR-IAC2 (2008) imagery in 2008
- City of Glendale – building outlines from earlier imagery, updated with LAR-IAC2 (2008) imagery in 2008
- City of Los Angeles – building outlines from LAR-IAC2 (2008), stereo generated, for all buildings > 64 square feet
- The rest of the County - building outlines from LAR-IAC2 (2008), stereo generated, for all buildings > 400 square feet
Most of the buildings in this dataset were generated using stereo imagery. This means that the person capturing the buildings actually saw them in 3-D, and therefore was able to more accurately capture the location of the roof line, since this method eliminated the impacts of building lean (where the height of the building impacts its apparent location). Basically – this is the most accurate method for capturing building outlines. In many cases the location is more accurate than our aerial photography and parcel boundaries.
This dataset is public as of November 1, 2012, and was created under license with Pictometry/Sanborn. County staff and LAR-IAC 2 Consortium members have full access to the data. I have attached a layer file below that will give you access to the data as long as you are connected to the County network.
- Building Outlines Layer File (ArcMap 10).lyr (for County staff only)
- Download data (zipped shapefile format) – 581 Mb (so be careful)
The Los Angeles Region Imagery Acquisition Consortium (LAR-IAC) Program is a collaborative acquisition program for digital aerial imagery data which has included the participation of 10 County departments, 30 municipalities, and four other public agencies.
The consortium is a model for regional cooperation that improves the quality, access, and cost-effectiveness of high resolution digital aerial imagery. Knowledge transfer is increased through consortium program meetings, user groups, and various workshops that have been established in conjunction with the project. The imagery acquired will enable all participating jurisdictions to leverage this key geographic information asset for numerous decision support and business applications, thereby facilitating the effective and efficient delivery of services.
Purchasing LAR-IAC Data
Government agencies acquire LAR-IAC elevation data only through the County consortium. Private companies can acquire LAR-IAC data as part of a project they are working on with a LAR-IAC consortium member, or by contacting the original data vendor, Pictometry/Sanborn.