Researching high-flying ways to produce the most accurate maps

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Researching high-flying ways to produce the most accurate maps

Over the summer, Fresno State graduate student Jacob Lopez sat in a cool, dark engineering lab on campus analyzing digital photos of the Sierra foothills captured by unmanned aerial vehicles (UAVs).

Lopez, a civil engineering major from San Diego with a focus on geomatics, is one of three students working on an aerial mapping research project with the California Department of Transportation. In mid-June, Lopez presented the project at a conference in the Netherlands.

“We’ve been given these resources to help Caltrans really take the time to understand the many aspects of this new technology,” Lopez said. “Everyone’s starting to use it now.”

Caltrans approached Dr. Riadh Munjy, professor and chair of the Department of Civil and Geomatics Engineering in the Lyles College of Engineering at Fresno State for help researching and determining the best practices using UAVs for high-accuracy mapping. The University’s geomatics engineering program is the first, four-year nationally-accredited comprehensive program in the nation and is the only one of its kind in California.

The state agency needs to establish guidelines such as which type of UAV to use — one with a fixed wing or a rotary system — how to fly it, what type of camera to use and ground control placement, Munjy said. Specifically, how it can be done and what type of equipment needs to be used, he said.

Fresno State’s Civil and Geomatics Engineering Department and Caltrans have a long history of working on photogrammetry research together — at least 30 years with Munjy. Photogrammetry is the science of taking measurements from a photograph to create a map, a drawing or model.

The findings from this three-year project, which is now in its final year, will give instructions on how to use UAVs in surveying and mapping. The findings can also be adopted by any agency producing photogrammetric maps.

Munjy and his team at Fresno State contracted private UAV pilots to perform three test flights over the San Joaquin Environmental Range, 4,462 acres of annual grass and oak-pine woodland off Highway 41 in Madera that serves as an outdoor laboratory for students. The team is preparing to do more test flights over a Cal Fire yard at the University of California, Davis this fall.

For many years there was a disconnect between drone manufacturers and photogrammetrists on how to use the technology, said John Erickson, chief in the Office of Photogrammetry and Preliminary Investigations for the Division of Engineering Services at Caltrans.

Traditionally, survey crews of two to three people are sent out to do topographic surveys of small areas. Planes are used to capture aerial photographs or lidar images using lasers of large areas.

UAV technology takes the process to the next level and can help agencies save money and increase safety practices, Erickson said.

“I haven’t heard of any other studies going this deep,” Erickson said. “There’s a lot of interest in the results of this project.”

The results so far are positive.

“We’re getting accuracies that even Dr. Munjy doesn’t believe,” Erickson said. “The surveys done on the test ranges are highly accurate.”