Learn about NH Stone Wall Mapper on Wednesday, May 15 at 7:00 p.m. Kate Belisle, volunteer mapper and computer expert, will show you how to take part in this citizen science project.

In early January 2019, the New Hampshire Department of Environmental Services launched a crowdsourcing effort to map all of New Hampshire’s stone walls using LiDAR* images. Learn how to use the New Hampshire Stone Wall Mapper to identify and mark stone walls with nothing more than a web browser.

*Light Detection and Ranging (LiDAR) is a remote sensing technology that assists archeologists in locating and identifying cultural features and landforms that are typically undetectable by traditional aerial photography, such as beneath heavy tree canopies. LiDAR utilizes light in the form of a pulsed laser to measure ranges, or distances to the ground surface. Variations in the return of laser reflections are processed to generate a digital elevation model. While LiDAR images may resemble strange and exotic landscapes, to the trained eye they reveal man-made features of the landscape, including cellar holes, stonewalls, and relict roadways.

NH Stone Wall Mapper
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