Sanborn Helps Boulder Solar Maps Shine

3-D Building Data Foundational for City's Rooftop Solar Tool

COLORADO SPRINGS, Colo., Nov. 17, 2015 -- In pursuit of transitioning its community to clean, local, affordable and reliable energy, the City of Boulder selected The Sanborn Map Company, Inc. (Sanborn) to optimize its 3-D building data for use as the cornerstone of the city's Rooftop Solar Tool. The tool helps citizens determine how much electricity can be produced on their rooftop from a solar photovoltaic (PV) system, what system may work best, and estimate their system cost and payback time.

Sanborn designed a fully automated, time-saving workflow that efficiently extracted 3-D building wireframes by auto-filtering the city's LiDAR point cloud in the ground, building and vegetation classes. Sanborn then tested and fine-tuned the parameters—depending on the land-cover and type of terrain—and the points in the building class were used to derive 2-D building polygons.

Finally, the 2-D polygons were used to create bounding boxes to extract the 3-D wireframes. Altogether, Sanborn extracted wireframes for more than 40,000 buildings with this approach. The data was found to be more than 90 percent accurate, far surpassing the city's requirement of 80 percent accuracy.

"For many community members, Boulder's Rooftop Solar Tool will spark the conversation about what is possible in terms of personal—and community-wide—power generation. For others, it will provide the information they need to take the next step toward going solar," says David Driskell, the city's executive director of community planning and sustainability. "This exciting development represents a key step on our community's path to clean, local power."

The project has identified 553 Megawatts of potential high-yield photovoltaic capacity capable of delivering 740,000 Megawatt-hours per year. This is enough clean, renewable energy to power 70,000 American households, create more than $2 billion in local business, and offset carbon emissions equivalent to planting more than 11 million trees.

About The Sanborn Map Company, Inc.
Sanborn ( is a preeminent leader in the exploding geospatial industry, delivering state-of-the-art mapping solutions to customers worldwide. The firm currently operates a fleet of 14 aircraft located strategically across the United States. Embracing cutting-edge technology, Sanborn specializes in oblique aerial imagery, aerial and mobile light detection and ranging (LiDAR) mapping, aerial orthophotography, 3-D modeling and visualization software and services, indoor mapping with its proprietary SPIN robot, unmanned aircraft system (UAS) sales, services and image processing, and a host of geospatial software development.

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