Description
A data block that provides access to a homogeneous and accurate digital elevation model (DEM) derived from the WorldDEM product.
See this block on the marketplace.
This is a restricted block. To use this block, request access.
Technical information
Compatible blocks
- Advanced Water-Related Geohazards Predictor
- Co-Registration
- K-means Clustering
- Raster CRS Conversion
- Raster Tiling
- Raster Zonal Statistics
- Sharpening Filter
- Spectral Data Converter - RGB
- Temporal Change Detection
- Time Series Image Statistics
- Viewshed
Dataset description
WorldDEM4Ortho is a homogeneous and accurate DEM 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 levelled 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. For more information, please refer to the the WorldDEM4Ortho Technical Product Specification
Geographic coverage
The geographic coverage is global.
Dataset information
| Specifications | Description |
|---|---|
| Data provider | Airbus |
| 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 |
| Can be reused in an UP42 workflow | No |
Limitations
The AOI must be larger than 0.1 km2.
How it works
| Supported JSON parameters | Default value | Min | Max | Examples |
|---|---|---|---|---|
bbox/intersects | null | 0.1 km2 | n.a. | Please check the examples from the JSON parameters. |
Examples
Example based on a workflow created with the data block WorldDEM4Ortho:
Capabilities
Output
raster
| up42_standard | |
|---|---|
bands | [
"dsm"
] |
dtype | float |
format | GTiff |
resolution | 24 |