A raster database of the average height of buildings above the ground (DHM) or average elevation above sea level of buildings and structures (DEM). The data layer is computed using the 3D Building Vector Model.
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„h Stereo Photogrammetry using Aerial Photography,
QuickBird, WorldView 1 or 2 and/or GeoEye satellite imagery
„h Default height assignment: Max Height
Digital Height Model or Digital Elevation Model
A raster database of the average height of buildings above the ground (DHM) or average elevation above sea level of buildings and structures (DEM). The data layer is computed using the 3D Building Vector Model
The 3D model is derived from high resolution aerial photography, WorldView 1 or 2, GeoEye 1and/or QuickBird satellite imagery (15 – 60cm nominal resolution; maximum cloud cover 0 – 10%). We select the most recent and cost effective sources and specifies these in the commercial offer.
3D building data are delivered in both raster and vector formats. The building vector file represents the building footprint and rooftop structures (x,y) outline and position with an elevation (z) attribute. The building raster is delivered either as a DHM and/or as a DEM, depending on the planning software and/or propagation models being used: Clutter, DSM, ORTHO
1. DHM: Digital Height Model representing only the building heights. Outside the building outlines, the model will have zero or null value. 2. DEM: Digital Elevation Model representing elevations of ground and buildings. (DHM+ Digital Terrain Model)
3D Building Model Raster
» Output Resolution 1m – 5m » Planimetric Accuracy (x, y) 3m – 5m (RMSE) » Altimetric Accuracy (z) 2m – 3m (RMSE) » Minimum Mapping Unit: » Minimum building area: 25 m² (5m x 5m)o Minimum building height: 4m
Derivation: » 3D Vector database. » Default height assignment: Max Height
A geometrically corrected 1 meter resolution satellite image.
Linear Vector Features
A vector database of transportation corridors (road width > 5m) and water features derived from satellite imagery and large-scale topographic maps.
The Models are suitable for3G/4G Planning, Micro-cell planning, Vertical positioning of field measurements, Line of Sight (LoS) computation, Diffraction-based algorithms, Empirical, semi-deterministic and ray-tracing models.