Surveyors sunk these markers all around big construction project - any idea what they signify/how they're used?pic.twitter.com/irBarhQ1ST
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@singernews they're the reference points from which they measure/triangulate every other spot. Just surveyed our property. Have a bunch.
@AdamS the 1-inch disc seems too big (too much error over yards) - must use drill spots as center?
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@singernews yeah. Theirs a spike at bottom of monopod that goes in the dimple. -
@singernews obviously "there's" -- damn autocorrect
End of conversation
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