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![Typical horizontal control triangulation mark geod1067.jpg Typical horizontal control triangulation mark](/sites/default/files/styles/max_1300x1300/https/s3.amazonaws.com/s3-east-testmedia-noaa.woc.noaa.gov/dam/Photos/legacy/pl23_geod1067.jpg?itok=LrBEnH4n)
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https://www.noaa.gov/media/digital-library-photo/pl23geod1067jpgDescription
Typical horizontal control triangulation mark.
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Geodesy
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