Cognised existence: A geodetic control point is a monumented position whose coordinates are determined to high accuracy so that all subsequent surveys and mapping can be tied to a common spatial reference. Without control points, independent datasets cannot be spatially registered to one another.
Question: Where are the geodetic control points, and what coordinates and accuracy do they define?
Realisations
1. Fikspunkter — National Geodetic Network
Fikspunkter is Denmark’s authoritative register of geodetic control points covering horizontal (plan) and vertical (height) networks for Denmark, Greenland, and the Faroe Islands.
Spatial Access Path
All fikspunkt entities carry direct GM_Point geometry.
PlanfikspunktDanmark → point (northing, easting in ETRS89/UTM32N)
HøjdefikspunktDanmark → point + kote (height above DVR90)
FikspunktSys34 → point (legacy System 34 planar coordinates)
HøjdefikspunktDNN → point + kote (legacy Dansk Normal Nul reference)
No joins needed — each control point carries its own coordinates.
Entity Types
| Entity | Role | Scope |
|---|---|---|
| PlanfikspunktDanmark | Horizontal control point | Denmark (ETRS89) |
| HøjdefikspunktDanmark | Vertical control point | Denmark (DVR90) |
| FikspunktSys34 | Legacy horizontal control | Denmark (System 34) |
| HøjdefikspunktDNN | Legacy vertical control | Denmark (DNN) |
| PlanfikspunktGrønland | Horizontal control point | Greenland |
| PlanfikspunktFærøerne | Horizontal control point | Faroe Islands |
| HøjdefikspunktGrønland | Vertical control point | Greenland |
| HøjdefikspunktFærøerne | Vertical control point | Faroe Islands |
Key Attributes
| Attribute | Description |
|---|---|
fikspunktsnummer | Unique point identifier |
northing / easting | Plane coordinates |
kote | Height value |
klasse | Accuracy class (plan points) |
koteklasse | Accuracy class (height points) |
maalemetode | Survey method |
middelfejl | Mean error estimate |
maaleaar | Year of measurement |
When to Use This Leaf
- Datum alignment: verifying or transforming coordinates between ETRS89, System 34, DVR90, and DNN.
- Survey control: anchoring new field measurements to the national reference network.
- Quality assessment: checking whether a dataset’s spatial accuracy is consistent with the control network it was tied to.
For ordinary address, parcel, or topographic work, control points are usually background infrastructure. Start from Addresses, Cadastral Parcels, or Transport Networks instead.
Temporal Model
Bitemporal. Control point coordinates are revised when re-measured; old coordinate vintages remain accessible through virkningFra/virkningTil.
Realised By Links
- Fikspunkter (collection)
Realised By Links
- Fikspunkter (collection)