XComThrowawayAcct
XComThrowawayAcct t1_j2a8zkm wrote
Reply to 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
The survey marker serves as a verified control point. When on site, it’s the one point you know it’s location to within acceptable tolerances. Everything else on site — everything — is measured trigonometrically relative to that point.
(These are not used anymore because we have GPS now. It provides a virtual survey marker almost anywhere, any time. We are living in the future.)
XComThrowawayAcct t1_j0nj5nm wrote
Reply to Favorite Quotes about Washington by clandestinewarrior
“Washington is a city of northern charm and southern efficiency.” —JFK
XComThrowawayAcct t1_j2a92it wrote
Reply to Where do I find the best pumpernickel bagels in DC? by Macrophage87
Bullfrog at Eastern Market.