Cognised existence: Elevation is the vertical distance of a point on the Earth’s surface above a datum. It determines where water flows, where floods reach, how much sun a slope receives, and what is visible from a point.
Question: What is the elevation at a given location?
Realisations
1. Danmarks Højdemodel (DHM)
DHM provides Denmark’s national elevation data from airborne LiDAR.
Spatial Access Path
DHM products are raster/point cloud — no entity joins.
Access is by spatial query: give coordinates, get elevation.
DTM (Terrænmodel): bare-earth elevation (0.4m grid)
└─ Use: hydrology, flood modelling, slope analysis
DSM (Overflademodel): including buildings, vegetation (0.4m grid)
└─ Use: visibility analysis, urban modelling, solar potential
Point cloud: raw LiDAR returns (~4-5 pts/m²)
└─ Use: custom processing, building extraction, forestry
Contour lines: derived from DTM (0.5m and 2.5m intervals)
└─ Use: cartographic display, terrain visualisation
Origin and quality layers: provenance and acquisition context for the DHM products
└─ Use: quality control, lineage, and interpreting model generation
Historical releases and hillshades: archived DHM vintages and derived terrain visualisations
└─ Use: temporal comparison, visual interpretation, and archaeological or landscape reading
Key Attributes
| Attribute | Description |
|---|---|
elevation_value | Height in metres above DVR90 datum |
horizontal_accuracy | ~0.15m |
vertical_accuracy | ~0.05m (terrain), ~0.10m (surface) |
acquisition_date | LiDAR campaign date |
2. Dataforsyningen Tile Services
Elevation data is also served as web services by SDFI:
- WCS: Web Coverage Service for elevation grids
- Download: GeoTIFF and LAZ tiles
- Contour WFS: Vector contour lines
Cross-Domain Relevance (Threads)
- Hydrosphere: Elevation drives water flow direction, flood modelling, catchment delineation. DTM is the foundation for hydrological analysis.
Classical Theme References
| Standard | Theme | Link |
|---|---|---|
| ISO 19115 | Elevation | |Elevation |
| INSPIRE | Elevation | |Elevation |
| UN-GGIM | Elevation and Depth | |Elevation and Depth |
Realised By Links
- DHMOprindelse (collection)
- Danmarks Højdemodel - Historik (2007 Højdekurver) (owner)
- Danmarks Højdemodel - Historik (2007 Overflademodel) (owner)
- Danmarks Højdemodel - Historik (2007 Punktsky) (owner)
- Danmarks Højdemodel - Historik (2007 Terrænmodel) (owner)
- Danmarks Højdemodel - Historik (2015) (owner)
- Danmarks Højdemodel - Højdekurver (owner)
- Danmarks Højdemodel - Oprindelse (owner)
- Danmarks Højdemodel - Overdrevet Skyggekort (owner)
- Danmarks Højdemodel - Overflade (owner)
- Danmarks Højdemodel - Punktsky (owner)
- Danmarks Højdemodel - Quick DHM (owner)
- GeoDanmark (collection)
Unmatched Realisations
- Dataforsyningen
Realised By Links
- DHMOprindelse (collection)
- Danmarks Højdemodel - Historik (2007 Højdekurver) (owner)
- Danmarks Højdemodel - Historik (2007 Overflademodel) (owner)
- Danmarks Højdemodel - Historik (2007 Punktsky) (owner)
- Danmarks Højdemodel - Historik (2007 Terrænmodel) (owner)
- Danmarks Højdemodel - Historik (2015) (owner)
- Danmarks Højdemodel - Højdekurver (owner)
- Danmarks Højdemodel - Oprindelse (owner)
- Danmarks Højdemodel - Overdrevet Skyggekort (owner)
- Danmarks Højdemodel - Overflade (owner)
- Danmarks Højdemodel - Punktsky (owner)
- Danmarks Højdemodel - Quick DHM (owner)
- GeoDanmark (collection)
Unmatched Realisations
- Dataforsyningen