Digital Elevation Models (DEMs) and GeoSAR
Digital Elevation Models (DEMs) are an integral part of any geospatial analysis. A DEM is a digital model or 3D representation of a terrain’s surface – created from terrain elevation data. Geoimage’s internal processing team can apply two variations of DEMs (DSM or DTM) to your satellite imagery depending on your requirements:
A Digital Surface Model (DSM) represents the Earth’s surface and includes all objects on it. This will include the heights of cultural features such as buildings, roads and vegetation as well as bare earth.
A Digital Terrain Model (DTM) represents the bare ground surface in which all the cultural features such as buildings and trees have been removed.
Figure Below: 1m Tri-Stereo DEM over Melbourne CBD
Geoimage also provide GeoSAR which is a 5m DEM product that produces 3D data and radar imagery. This airborne mapping system allows generation of topographic maps and other derived products.
What is unique about GeoSAR is it penetrates tree canopy allowing for greater detail over your AOI. It is only available over Papua New Guinea and Geoimage are the only Australian company that can sell this product. If you need more information on GeoSAR please send us an email and we will provide you with additional information.
Features and Benefits
- Worldwide availability of satellite data without any access restrictions
- Large area coverage
- Fast processing time
- Resolution from very high to regional
- Low processing cost
Before and after
High Resolution AW3D (DEM) Data
Common Uses of DEMs Includes
- Extracting terrain parameters
- Modelling water flow or mass movement (e.g. avalanches and landslides)
- Creation of relief maps
- Orthorectification of aerial photography of satellite imagery
- Engineering and infrastructure design
- Terrain analysis in geomorphology and physical geography
- Line-of-sight analysis
- Hydrological modelling – flood mitigation or watershed analysis
- Base mapping
- Environmental change application
- Risk assessment
Access first-class geospatial data sources
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