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2016 3-foot Digital Elevation Model (DEM) – LARIAC 4

 

Digital Elevation Model (DEM) acquired as part of the Los Angeles Regional Imagery Acquisition Consortium in 2016.  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 .

This dataset replaces the 2006 5-foot (1.7M) Digital Elevation Model (DEM) – LARIAC.

Download

The US Geological Survey has placed the DEM and classified LAS into public domain for download on The National Map.

Description

This dataset is one of a group of elevation related datasets acquired by LARIAC in 2016.  These datasets included:

  1. Digital Elevation Model gridded
  2. Digital Elevation Model point
  3. Digital Surface Model gridded
  4. Digital Surface Model point
  5. 1-foot contours (urban areas) and 2-foot in National Forest areas

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 Digital Elevation Model was acquired using LiDAR (Light Detection And Ranging), which used a laser mounted in planes that were acquiring 4-inch orthophotography data.  Hundreds of millions of ground measurements were made using this system, which makes it extremely accurate.  This source was used for urban/suburban areas of the County in mainland (approximately 4,107 square miles) and Catalina Island covering approximately 107 square miles, while for the National Forest contours were created using stereo compilation.

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 LARIAC Product Guide.

We highly recommend that you visit the LARIAC Project Website to find a rich source of information about the data and the LARIAC 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.

LARIAC data is held under license from Eagle View Technologies, Inc. (formerly Pictometry International Corp), and cannot be publicly released.  Government entities are eligible to join the LARIAC program to access the data.  Private entities may contact EagleView directly to purchase selected parts of the data.

 

About LARIAC

The Los Angeles Region Imagery Acquisition Consortium (LARIAC) 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 LARIAC data

Government agencies acquire LARIAC elevation data only through the County consortium.

Private companies can acquire LARIAC data as part of a project they are working on with a LARIAC consortium member, or by contacting the original data vendor, Eagle View.

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: eGIS_Elevation
Feature Class Name: DEM
Feature Dataset Name (if applicable):
Reference Date: 2016
Accuracy: Parcel
Update Frequency: Unknown
Access Constraints:Government

Contact Information
Steve Steinberg
LARIAC Project Director & GIO
County of Los Angeles
Internal Services



egis@isd.lacounty.gov
(562) 392-7126

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