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2014 4-inch and 1 foot Orthophoto Imagery Seamline and Date Flown – LARIAC 4

These dataset contains the dates of the imagery as well as the image chips that were compiled into the 2014 Los Angeles Regional Imagery Acquisition Consortium (LARIAC4) 4-inch and 1-foot color orthophotography.

Each polygon contains an 8 digit number that corresponds to the date the image was acquired (for example, 20140125 corresponds to January 25, 2014) .  Over 390,000 individual image chips were merged to create a seamless orthophoto across the County of Los Angeles.  The Date Flown dataset will enable participants and other entities to know the date the image was acquired, while the seamlines will enable participants to know the exact source of the image.

Processing History

Pictometry created the LARIAC4_Seamlines that show the individual image chips that were used to compile the data.  The Ortho Date Flown was extracted from this large polygon file (over 390,00 polygons).  In order to reduce the size of the file and increase the speed of drawing, the boundaries were smoothed using the ArcMap simpilify polygon command to reduce the number of vertices, which reduces the file size while not dramatically impacting accuracy.

Other LARIAC Data

These, along with other datasets, can be found on the LARIAC4 Data and Documents page, but they are also available below for download.

Download the data

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Data Field Descriptions

ShotDate - the date the image was taken


GIS Source Information
Database Name: LARIAC4
Feature Class Name: LARIAC4_ORTHO_IMAGERY_DATE_FLOWN,LARIAC4_SEAMLINES
Feature Dataset Name (if applicable):
Reference Date: 2014
Accuracy: Other
Update Frequency: Other
Access Constraints:None

Contact Information
Steve Steinberg
Geographic Information Officer
Los Angeles County
Internal Services Department
9150 E. Imperial Hwy, MS#3
33.916650, -118.132255
Downey, CA 90242
SSteinberg@isd.lacounty.gov
(562) 392-7126

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