Color Infrared, leaf-off, 0.33-foot (4-inch) high-resolution, high-accuracy orthorectified aerial imagery, acquired by the Los Angeles Regional Imagery Consortium (LAR-IAC) in winter 2005/2006.
Infrared is an additional wavelength of information that can be captured by many aerial photography sensors in addition to the general Red/Green/Blue (RGB) channels typical to most imagery. The Infrared band can be analyzed to easily separate vegetation from non-vegetated areas through image analysis, lending itself to find pervious vs. impervious surfaces, among other things. The CIR from LAR-IAC has been used to extract the following information from the high-resolution imagery data:
- Buildings
- Trees
- NDVI (Normalized Difference Vegtation Index)
This imagery covers the majority of urban/suburban areas of the County in mainland (approximately 2,898 square miles) and Catalina Island covering approximately 75 square miles. The rest of the County, covering the National Forest, is covered by a one foot (1-foot) resolution digital orthoimagery, approximately 1,056 square miles, and is a separate dataset. Information about that data is available in another part of the portal.
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.
Detail
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.