| Gw Ref Cd |
Gw Ref Ds |
| C |
Calculated from land net |
| D |
Differentially corrected Global Positioning System. |
| W |
GNSS1 - Level 1 Quality Survey Grade Global Navigation Satellite System |
| X |
GNSS2 - Level 2 Quality Survey Grade Global Navigation Satellite System |
| Y |
GNSS3 - Level 3 Quality Survey Grade Global Navigation Satellite System |
| Z |
GNSS4 - Level 4 Quality Survey Grade Global Navigation Satellite System |
| N |
Interpolated from Digital MAP. |
| M |
Interpolated from MAP. |
| L |
Long range navigation system. |
| G |
Mapping grade GPS unit (handheld accuracy range 12 to 40 ft) |
| R |
Reported. |
| F |
Survey-grade GPSF |
| S |
Transit, theodolite, or other surveying method. |
| U |
Unknown. |
