The physical realisation of the reference systems — surveyed points on the ground whose coordinates are known to high precision, and to which all other surveys are tied.
Sphere: Reference Framework
Scope
- Geodetic control points: Horizontal and vertical control networks (in Denmark, Fikspunkter, maintained by SDFI)
- Height benchmarks: Levelling points realising the vertical datum (DVR90)
- GNSS reference stations: Permanent stations and correction services
- Tide gauges: As vertical reference for coastal and marine datums
Leaves
| Leaf | Question | Lens | Connection |
|---|---|---|---|
| Geodetic Control Points | Where are the geodetic control points, and what coordinates and accuracy do they define? | primary |
Classical Theme Mappings
| Standard | Theme | Link |
|---|---|---|
| INSPIRE | Coordinate Reference Systems | Coordinate Reference Systems |
| UN-GGIM | Global Geodetic Reference Frame | Global Geodetic Reference Frame |