Trailhead location for Washington DC to Pittsburgh
| Milepost | Amenity Name | location coordinates | show in Icon List | show on mileage chart | steps | ||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| GAP MP148.822 | map The Point in Point Park (GAP 148.8) | 40.441888, -80.0132462 |  | ||||||||
| GAP MP148.07 | map Monongahela Wharf parking (GAP 148.1) | 40.4363135, -80.0013465 | | ||||||||
| GAP MP147.644 | map First Avenue Garage (GAP 147.6) | 40.4345701, -79.9958596 | | ||||||||
| C&O MP185.001 | map C&O Milepost 184,5 (C&O 185) | 39.6493521, -78.7630137 |  | ||||||||
| C&O MP184.5 | map Cumberland MP 184.5 (C&O 184.5) | 39.6430434, -78.7647399 | | ||||||||
| C&O MP110.4 | map McCoys Ferry MP 110.4 (C&O 110.4) | 39.6082279, -77.9701689 | | ||||||||
| C&O MP106.8 | map Dam 5 MP 106.8 (C&O 106.8) | 39.6070473, -77.9218485 | | ||||||||
| C&O MP14.3 | map Great Falls MP 14.300 (C&O 14.3) | 39.0004934, -77.2484312 | | ||||||||
| C&O MP0.1 | map Thompson Boat House MP 0.100 (C&O 0.1) | 38.9003641, -77.0582564 | | ||||||||
| GAP MP128.249 | map Boston Trailhead (GAP 128.2) | 40.3109731, -79.8274937 | | ||||||||
| GAP MP132.394 | map McKee Point Marina (GAP 132.4) | 40.3498619, -79.8690132 |  | ||||||||
| GAP MP128.249 | map Boston (GAP 128.2) | 40.3106326, -79.8272729 |  | ||||||||
| GAP MP125.994 | map Greenock (GAP 126) | 40.3123504, -79.7922872 | | ||||||||
| GAP MP117.959 | map Sutersville (GAP 118) | 40.241988, -79.8060859 |  | ||||||||
| GAP MP114.212 | map West Newton information Center (GAP 114.2) | 40.2125749, -79.7693683 |  | ||||||||
| GAP MP12.474 | map Trimble Ln (GAP 12.5) | 39.6813294, -78.8820259 | | ||||||||
| GAP MP11.682 | map patty Baker Ln (GAP 11.7) | 39.690831, -78.8798759 | | ||||||||
| GAP MP9.549 | map WoodCock Hollow Rd (GAP 9.5) | 39.6823838, -78.8556301 | | ||||||||
| GAP MP5.222 | map Cash Valley Rd (GAP 5.2) | 39.6780156, -78.8042953 | | ||||||||
| MPzero | map Cumberland - Gap milepost 0 | 39.6493521, -78.7630137 |  | ||||||||
| map Connellsville Waterplant | 39.9893113, -79.5937822 | | |||||||||
| map Connellsville | 40.0163943, -79.5996103 | | |||||||||
| map Fen Cliff Parking | 39.8719061, -79.4936937 | | |||||||||
| map Ohiopyle Parking | 39.8698575, -79.4914462 | | |||||||||
| map Ramcat Parking | 39.8264806, -79.3788382 | | |||||||||
| GAP MP140.438 | map Ladle Car Parking (GAP 140.4) | 40.4113221, -79.9153089 | | ||||||||
| GAP MP139.358 | map WaterFront Pumphouse (GAP 139.4) | 40.4126391, -79.8970628 | | ||||||||
| map Duquesne - Port Athority Parking | 40.3719032, -79.8440658 | | |||||||||
| GAP MP132.518 | map Police parking lot (GAP 132.5) | 40.3514096, -79.8690165 | | ||||||||
| map Evergreen Dr | 40.1764449, -79.7701031 | | |||||||||
| map Smitihton | 40.1587159, -79.7473592 | | |||||||||
| map Van Meter | 40.1355081, -79.7459107 | | |||||||||
| map Whistett | 40.1068508, -79.7561377 | | |||||||||
| map Dawson | 40.0454193, -79.6618845 | | |||||||||
| map Adelade | 40.0422593, -79.6248984 | |
OLC (Open Location Codes) (aka Plus Codes) are a way of encoding location into a form that is easier to use than providing coordinates in the usual form of latitude and longitude. They are designed to be used like street addresses, and may be especially useful in places where there is no formal system to identify buildings, such a street names, number, and post codes.[4]
Since August 2015, Google Maps supports plus codes in the address box.
The Open Location Code website provides an overview. The document An Evaluation of Location Encoding Systems provides a rationale.
Trail Lines are typically entered by tracing satellite imagery to extract latitude/longitude coordinates. The accuracy of these coordinates changes depending on the source of the photo and the precision of placement. I have seem satellite edges mismatched on the order 55 feet. Line work is sometimes extracted from the Open Street Map Project and from Strava heat maps.
>Milepost Known milepost (are placed on the map when they are visible in the satellite image or can be located via to visible features in the image. Other miles posts are extrapolated using calculations along the rail line. Note Railroads have also been known to realign trackage and not move existing mileage markers, only making an annotation on their paper maps.
Distances Above are based on the google map distance between two points along the line work.