Surveying & Mapping

Mobile Scanning, Doyle Drive / Route 101 | San Francisco, CA




Surveying & Mapping

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Case Study in CE News - Caltrans Evaluates Costs, Benefits

Lower Cost Alternative plus 90% Reduction of Risk Exposure to the Public

Doyle Drive is an important section of U.S. 101 that connects San Francisco to the Golden Gate Bridge through Presidio Park. The roadway is being rebuilt as the Presidio Parkway, part of the overall Presidio Parkway Design that will reduce impact to biological, cultural and natural resources; respect the project setting within a national park; and provide a safer roadway.

In this $1-billion enhancement, the roadway is being redesigned to nestle in the natural contours of the park while improving seismic, structural and traffic safety. Psomas and our subconsultant, WHPacific, provided GPS control and mobile scanning utilizing a LYNX Mobile Mapper vehicle for study and design-grade survey data of Doyle Drive and associated ramps. Caltrans provided post ground confidence survey points and control data for the point cloud transformation and sanitation.

Psomas also prepared a cost/benefit analysis of mobile scanning and terrestrial survey techniques. It was estimated the use of mobile scanning technology provided a net savings of approximately $167,000, along with a 90% reduction of risk exposure to the traveling public and workers.