pl23_geod1088.jpg
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https://www.noaa.gov/media/digital-library-photo/pl23geod1088jpgDescription
Model 8 Geodimeter measuring distances from a rooftop in Chicago. Note the reddot to right of instrument. This is the laser-light return signal reflectingfrom a glass prism atop another building.
Location
Illinois, Chicago
Collection
Geodesy