California Department of Transportation

Project Development Workflow Tasks (PDWT)

Part 3 - Identify Project Need and Project Initiation Document

II. Project Initiation Document

A. Define Transportation Need and Assess Site (150.05) - Obtain and Review Existing Reports, Studies and Mapping (150.05.05)

P17. Obtain Highway Inventory Photos

Digital Highway Inventory Photography Program (DHIPP) is comprised of ortho-rectified, geo-referenced, color, digital, aerial, high-resolution (0.3m pixel) imagery. DHIPP imagery may be imported into microstation and other software programs.

Prior to DHIPP, the entire State Highway system was photographed every five years. Approximately one-fifth of the highway system was photographed each year with emphasis on newly completed projects. The photographs, known as Highway Inventory Photos, are still available but have largely been replaced by DHIPP imagery.

The District Survey Office or Traffic Office may maintain Highway Inventory Photographs. Engineers must not remove Highway Inventory Photographs without permission. Copies of Highway Inventory Photographs may be requested from the district’s Photogrammetry Coordinator. Some districts utilize a Photogrammetry Request form for requesting duplicate photos, photo enlargements, or photos suitable for xerographic reproduction.


User’s Guide to Photogrammetric Products and Services (1996)

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This page last updated July 20, 2010