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.LilGeographersRoom OP t1_j2du9gv wrote
Reply to comment by the_real_dmac 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
Does Metro maintain these discs alone, or do they keep their measures in tangent with USGS?
Viewing a single comment thread. View all comments