Mystery WMATA/Metro survey markers: Can any intrepid city planners or engineers explain what these discs are (or were) used for? I seem them all over the place, even sometimes away from Metro stops.AngelsGoHome t1_j29oluk wrote
Reply to comment by V_T_H in Mystery WMATA/Metro survey markers: Can any intrepid city planners or engineers explain what these discs are (or were) used for? I seem them all over the place, even sometimes away from Metro stops. by LilGeographersRoom
I think they just might be "the Metro" survey pins. It seems the placing agency labels their pins (e.g., USGS) which helps identify the owner.
Metro obviously has critical infrastructure around and in between stations.
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