Cognised existence: Orthoimagery is a geometrically corrected aerial or satellite photograph — the surface as seen from above, with positional accuracy. It is the most intuitive spatial data: it shows what the world looks like.
Question: What does the Earth’s surface look like at a location?
Realisations
Instead of hardcoding implementation schemas here, SPHERE separates semantic meaning from dataset implementation. The realisations are listed in priority order:
- GeoDanmark Orthophotos (passive_rs)
- Dataforsyningen Services (passive_rs)
- Copernicus (Sentinel-2) (passive_rs)
Not in a Sphere
Orthoimagery has no twig membership. An orthophoto is not about a theme: it is the product of a collection method, passive remote sensing, and it is the backdrop that other data is digitised from. Those digitised products, such as GeoDanmark buildings, are cartographic_compilation realisations with derived_from: [passive_rs]. Find imagery through Collection Methods or by search.
Thematic products interpreted from imagery, such as land cover classifications or NDVI, enter the network through their analytical focus. For example, land cover belongs to anthroposphere_perception_thematics and NDVI to biosphere_vegetation.
Classical Theme References
| Standard | Theme | Link |
|---|---|---|
| ISO 19115 | Imagery/BaseMaps/EarthCover | Imagery/BaseMaps/EarthCover |
| INSPIRE | Orthoimagery | Orthoimagery |
| UN-GGIM | Orthoimagery | Orthoimagery |