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. Submitted by LilGeographersRoom t3_zz42rw on December 30, 2022 at 4:03 PM in washingtondc 30 comments 88
_TW06_ t1_j29rjmr wrote on December 30, 2022 at 5:56 PM They are indeed survey markers… explore this map, it’s pretty interesting. https://geodesy.noaa.gov/NGSDataExplorer/ Permalink 48
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.
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