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2006 5-foot (1.7M) Digital Elevation Model (DEM) – LAR-IAC

 

Digital Elevation Model (DEM) acquired as part of the Los Angeles Regional Imagery Acquisition Consortium in 2006.  The DEM represents bare earth, whereas a related product (DSM) contains elevations and includes buildings, vegetation, and roads, as well as natural terrain features, whereas .

Download

The 5 foot data cannot be downloaded since it is licensed.  However, LA County has worked with the US Geological Survey to place a lower resolution version into the public domain.  You can get the 10 foot public domain version following the instructions here:

2006 10-foot Digital Elevation Model (DEM) – LAR-IAC – Public Domain

Description

This dataset is one of a group of elevation related datasets acquired by LAR-IAC in 2006.  These datasets included:

  1. Digital Elevation Model gridded
  2. Digital Elevation Model point
  3. Digital Surface Model gridded
  4. Digital Surface Model point
  5. 2-foot contours

The DEM is a critical component for a large variety of applications, most which require specialized training, software, and skills, but are critical for organizations:

  • Relief Mapping
  • Contour development
  • Hillshades
  • Watershed Modeling
  • Flood Modeling
  • Solar Mapping
  • Terrain Modeling
  • and many others.

The elevation data acquired by the County has two sources of information:

  1. LIDAR (Light Detection And Ranging), which used a laser mounted in the planes that were acquiring the 4-inch orthophotography data.  Hundreds of millions of ground measurements were made using this system, which is extremeley accurate.  This source was used for the majority of urban/suburban areas of the County in mainland (approximately 2,898 square miles) and Catalina Island covering approximately 75 square miles.
  2. Stereo Compilation – Overlapping pictures were analyzed to extract the elevation data.  This is a more historical technique that produced a less accurate, but still valuable product.  This data covers the Angeles National Forest, approximately 1,056 square miles, and is a separate dataset.

DEM Detail

This dataset meets or exceeds ASPRS (American Society for Photogrammetry and Remote Sensing) 1:100 scale mapping.  Accuracy is within +/- 2 feet of true location with 95% confidence.

Detailed product information is contained in the LAR-IAC Product Guide.

We highly recommend that you visit the LAR-IAC Project Website to find a rich source of information about the data and the LAR-IAC program.  The site includes project documents, full FGDC compliant metadata, data downloads of related GIS used to complete the project, sub-licensing information, sample imagery and data, and information about the 2006 acquisition.

GIS Data showing flight-date information is available from the site, and elsewhere in the LA County GIS Data Portal.

The imagery is held under license from InfoTech International, and cannot be publicly released.  Government entities are eligible to join the LAR-IAC program to access the data.  Private entities may contact InfoTech directly to purchase selected parts of the data.

 

 

 

About LAR-IAC

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.

Using GIS Data on this site

GIS Data downloaded from this site generally requires GIS software to view. Click here for a list of GIS Data Viewers

GIS data available on this website is provided AS IS - please read the GIS Data Portal Terms of Use

Data Field Descriptions

The DEM contains a single value field, which represents the height of the cell in feet.


GIS Source Information
Database Name: AERIAL
Feature Class Name: LARIAC.DEM
Feature Dataset Name (if applicable):
Reference Date: 2006
Accuracy: Parcel
Update Frequency: Unknown
Access Constraints:Government

Contact Information
Steve Steinberg
Geographic Information Officer
County of Los Angeles
Internal Services Department



SSteinberg@isd.lacounty.gov
562-392-7126

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