Copernicus DEM (COP-DEM)

Aperçu du produit

Contexte

The Copernicus DEM is a Digital Surface Model (DSM) that represents the Earth’s surface. The Copernicus DEM is provided by the European Space Agency (ESA) in 3 different instances:

• COP-DEM-EEA-10 : provides coverage of the European Economic Area (EEA) member states and the 6 cooperating countries at 0.3 arc seconds (~10m) spatial resolution

• COP-DEM-GLO-30 : provides global coverage at 1.0 arc seconds (~30m) spatial resolution

• COP-DEM-GLO-90 : provides global coverage at 3.0 arc second (~90m) spatial resolution

There are two instances of the COP-DEM-GLO-30 Copernicus DEM: COP-DEM-GLO-30-R and COP-DEM-GLO-30 Public. COP-DEM-GLO-30 Public provides limited worldwide coverage at 1.0 arc seconds (~30m) spatial resolution because a small subset of tiles covering specific countries are not yet released to the public by the Copernicus Programme. The list of countries presenting constraints in terms of access rights is available here. COP-DEM-GLO-30-R provides complete global coverage, but is only accessible to users belonging to the authorised users categories as defined in the applicable license.

Digital Earth Africa provides free and open access to a copy of the COP-DEM-GLO-30 Public and COP-DEM-GLO-90 products over Africa. For more information on these products see the Copernicus DEM website and Copernicus DEM Product Handbook.

A Jupyter Notebook which demonstrates loading and using DEM datasets in the Sandbox is also available.

Spécifications

Couverture spatiale et temporelle

Relevant metadata for the COP-DEM-GLO-30 Public and COP-DEM-GLO-90 products can be viewed on the DE Africa Metadata Explorer here and here.

Table 1: COP-DEM-GLO-30 Public and COP-DEM-GLO-90 product specifications

Specification
Nom du produit	dem_cop_30	dem_cop_90
Cell size - X (arc seconds)	1.0 (~30 m)	3.0 (~90 m)
Cell size - Y (arc seconds)	1.0 (~30 m)	3.0 (~90 m)
Système de référence des coordonnées	EPSG : 4326	EPSG : 4326
Fréquence de mise à jour	None, except if the public tile list changes.	None

The specific temporal and geographic extents for the products can be explored as an interactive map on the Metadata Explorer here and here. Data is available for the regions shaded in blue.

Figure 1: COP-DEM-GLO-30 Public geographic extent

Figure 2: COP-DEM-GLO-90 geographic extent

Mesures

Table 2: COP-DEM-GLO-30 Public and COP-DEM-GLO-90 product measurements

Nom du produit	ID de la bande	Description	Unités	Type de données	Aucune valeur de données
dem_cop_30	elevation	Elevation data	1	float32	NaN`
dem_cop_90	elevation	Elevation data	1	float32	NaN`

Traitement

The Copernicus DEM is derived from an edited DSM named WorldDEM which was based on the radar satellite data acquired during the TanDEM-X Mission. For the edited WorldDEM, the flattening of water bodies and consistent flow of rivers has been included, and editing of shore- and coastlines, special features such as airports and implausible terrain structures has also been applied. The edited WorldDEM was also infilled on a local basis with the following DEMs: ASTER, SRTM90, SRTM30, SRTM30plus, GMTED2010, TerraSAR-X Radargrammetric DEM, ALOS World 3D-30m. The Copernicus DEM product generation and editing process is described in the Product Handbook.

Médias et exemples d’images

Figure 3: COP-DEM-GLO-30 Public elevation data for Mt. Kilimanjaro

Figure 4: COP-DEM-GLO-90 elevation data for Mt. Kenya

Références

The Copernicus DEM website

The Copernicus DEM Product Handbook

License and Acknowledgements

The GLO-90 dataset is available worldwide with a free license. The GLO-30 dataset is available worldwide with a free license with the exception of two countries, reported in a dedicated list and available within the dataset COP-DEM_GLO-30-R. Full licences are available here.

Accès aux données

Amazon web services S3

The GLO-30 Public and GLO-90 instances of the Copernicus DEM are available in AWS S3 sponsored by the Public Dataset Program.

Table 3: Copernicus DEM GLO-30 Public and GLO-90 AWS data access details

Détails sur AWS S3
Product	GLO-30 Public	GLO-90
Seau ARD	arn:aws:s3:::copernicus-dem-30m	arn:aws:s3:::copernicus-dem-90m
Région	eu-central-1	eu-central-1

The file paths follow the basic data formart: Copernicus_DSM_COG_[resolution]_[northing]_[easting]_DEM/ e.g. s3://copernicus-dem-90m/Copernicus_DSM_COG_30_S90_00_W178_00_DEM/

Tableau 4 : Convention de chemin d’accès aux fichiers AWS.

Élément de chemin d’accès au fichier	Description	Exemple
resolution	Resolution in arc seconds.	10 for GLO-30, and 30 for GLO-90
northing	This is the northing of the center of the bottom-most pixels in the original files.	S50_00
easting	This is the easting of the center of the left-most pixels.	w125_00

Services Web de l’OGC (OWS)

This GLO-30 Public and GLO-90 instances of the Copernicus DEM are available through DE Africa’s OWS.

Table 5: OWS data access details.

Détails de l’OWS
Nom	DE Africa Services
URL des services cartographiques Web (WMS)	https://ows.digitalearth.africa/wms?version=1.3.0
URL du service de couverture Web (WCS)	https://ows.digitalearth.africa/wcs?version=2.1.0
Noms des couches	dem_cop_30, dem_cop_90

Les détails de Digital Earth Africa OWS peuvent être trouvés sur https://ows.digitalearth.africa/.

Pour obtenir des instructions sur la manière de se connecter à OWS, consultez ce tutoriel.

Open Data Cube (ODC)

The GLO-30 Public and GLO-90 instances of the Copernicus DEM can be accessed through the Digital Earth Africa ODC API, which is available through the Digital Earth Africa Sandbox.

ODC product names: dem_cop_30, dem_cop_90

Specific bands of data can be called by using either the default names or any of a band’s alternative names, as listed in the table below. ODC Datacube.load commands without specified bands will load all bands.

Table 6: ODC products dem_cop_30 and dem_cop_90 band names

Product	Nom du groupe	Noms alternatifs	Valeur de remplissage
dem_cop_30	elevation	NaN	NaN
dem_cop_90	elevation	NaN	NaN

Informations techniques

The Copernicus DEM was validated using the Geoscience Laser Altimeter System (GLAS) of NASA’s Ice, Cloud and land Elevation Satellite (ICESat). The Global RMSE is 1.68 metres. The accuracy assessment is split into two parts, since the ice-covered regions have to be treated differently from the non-ice-covered regions, which are described in the Validation Report.