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GPS target

By Pacific Coastal and Marine Science Center September 2019 (approx.)
A small device sits on a tripod which rests on a square tarp pinned down on a flat area of grass.
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Detailed Description

A global positioning system (GPS) sits on a tripod and is used to accurately pinpoint the center of a target that itself is used for photo rectification with aerial photos. 

Sources/Usage

Public Domain.