| Gw Ref Cd |
Gw Ref Ds |
| A |
Altimeter. |
| D |
Differentially corrected Global Positioning System. |
| F |
Survey-grade GPSF |
| I |
Interferometric Synthetic Aperture Radar, airplane |
| J |
Light Detection And Ranging, airplane |
| L |
Level or other surveyed method. |
| M |
Interpolated from topographic map. |
| N |
Interpolated from Digital Elevation Model |
| R |
Reported method of determination. |
| 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 |
