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WorldDEM4Ortho
Description
Provides access to a homogeneous and accurate digital elevation model (DEM) in GeoTIFF format. WorldDEM4Ortho is optimized for the orthorectification of high resolution (HR) and very high resolution (VHR) optical and radar images. Based on the WorldDEM, the WorldDEM4Ortho is a hybrid product. Urban building areas as well as small objects (e.g. power pylons) and small groups of trees are leveled down to approximate bare ground. In these areas, the WorldDEM4Ortho is a digital terrain model (DTM) )-like product. Vegetated areas including large forest areas and bare soil are represented as a digital surface model (DSM) with moderate smoothing.
Technical information
| Spatial resolution | 24 m |
| Image type | Radar |
| Acquisition mode | Bi-static InSAR StripMap mode |
| Geometric processing level | Correction of terrain artefacts, such as layover and shadow. Hydrological correction (editing of water bodies). DTM-DSM hybrid: removal of buildings, small infrastructure elements and small forest patches; moderate smoothing of vegetation and bare soil. |
| Absolute vertical accuracy | 2.5 m (90% linear error) |
| Absolute horizontal accuracy | < 6 m (90% circular error) |
| Relative vertical accuracy | < 2 m (slope ≤ 20% : 90% linear point-to-point error within an area of 1° x 1°) < 4 m (slope ≥ 20% : 90% linear point-to-point error within an area of 1° x 1°) |
| Data acquisition period | 2011 to 2015 |
| Spectral band | X-band |
| File format | GeoTIFF |
| Bit depth per pixel | 32-bit |
| NoData value | -32767 |
| Vertical unit | meters |
| Coordinate system | Horizontal: WGS84/EPSG:4326 Vertical: EGM2008/EPSG:3855 |
| Limitations | The AOI must be larger than 0.1 km2 |
| Volume discounts | For orders larger than 2,500 km2, please contact [email protected] for volume discounts. |
User registration process and data access
Due to regulations about this data set, a user registration and compliance process is required before access to the data is granted. Access can currently not be provided for individual users. Data usage requires additional partner approval.
Sensitive countries are excluded from downloading the full-resolution product (please contact [email protected] for a release request).
Further information
For more information, please refer to the WorldDEM Technical Product Specification.