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)

P16. Request Mapping

During the PID phase of a project, mapping should be used by the project engineer as a base drawing for the preparation of project alternatives, exhibits and attachments to the PID. The Surveys Unit maintains topographical or USGS mapping, or mapping from prior projects, which may be usable for these purposes. The project engineer should contact Right of Way Engineering or Surveys for any existing mapping prior to requesting new mapping.

Engineers are cautioned not to use very old mapping, and to not use mapping that does not have sufficient accuracy for the preparation of project plans. Engineers should use the least costly mapping products necessary to prepare the PID. Typically, engineers should use scanned maps or photographs for PID documents. These maps are suitable for preparing exhibits and PID attachments, but they are not suitable for detailed design.

High accuracy mapping that is used for the creation of a 3-D digitized terrain model (DTM) are for design purposes, and require a long lead-time from when requested. The Engineer should anticipate the lead-time to be one year or greater. Typically, this type of mapping is not requested until the project is programmed and resourced.

Although it is desirable to use high accuracy mapping during the development of the PID, the cost and time it takes to obtain the mapping may be impractical or the expenditure of resources not allowed during the PID phase. The Engineer, the project manager, and the Surveys Office Photogrammetry Coordinator should confer on the appropriate mapping product that is needed during the PID phase. If detailed mapping is critical to scoping the PID, it should b obtained. If mapping is a controlling or critical element of project delivery it may be initiated during the PID.

Time Constraint

The project engineer should anticipate the lead-time to be one year or greater. This information should be conveyed to Planning in order to adequately resource and schedule any PID requiring detailed mapping or survey effort.


User’s Guide to Photogrammetric Products and Services

CADD Users Manual of Instruction (Section 3.1, Procedural Guidelines)

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This page last updated July 20, 2010