- Highly accurate and consistent digital elevation models for whole USA
- Complete country wide DTM and DSM mosaics available
- Orthorectified SAR imagery as add-on option
- 5 m ground spacing, up to 1 m vertical accuracy
- 1.25 m orthorectified SAR image as add-on option
- Start with areas as small as 11 km2 without extra costs
- Check NEXTMap as a Service - USA and save costs with short term licenses
NEXTMap DEM - USA is a digital elevation model for the whole of USA with 5 m spatial resolution and up to 1 m vertical accuracy. The dataset consists of a digital surface model (DSM) and a digital terrain model (DTM) as a bundle. If you are interested in the orthorectified radar images (ORI), or the DSM or DTM as a single layer, please contact us.
Consultants, engineering bureaus and agencies benefit from this widely used data set in various applications. Land and water management, natural resource planning, telecommunications, forestry and mining are some of many examples.
Off the shelf
Resolution - DTM and DSM
Resolution - ORI
NEXTMap digital elevation models are of high demand in various applications. The well-proven data set is easy to use in all standard remote sensing and GIS software. The data are particularly suitable for in-depth planning purposes that require thorough attention to detail of the terrain.
Uses include, but are not limited to:
- Agriculture: precision farming
- Disaster management and emergency response
- Environmental: risk analysis, climate studies, wildlife habitat analysis
- Forestry: planning and management, land cover classification, canopy height modeling
- Geological: landscape analysis, resource conservation and exploration, surface mining
- GIS: mapping, image orthorectification, contour generation
- Infrastructure: engineering, architecture, construction, transport networks, air traffic routing, flight simulations
- Military, security and safety
- Multimedia applications, vehicle navigation systems, consumer electronics and computer games
- Telecommunications: transmission line corridor planning, line-of-sight analysis, radio propagation modeling
- Water management: flood modeling, risk assessment, watershed analysis, drainage applications
The high resolution NEXTMap database provides seamless, wide-area digital elevation data and images for Western Europe, collected using advanced technologies, to enable accurate geospatial analysis across the globe.
The NEXTMap high-resolution database consists of:
- A digital surface model (DSM) containing elevations of natural terrain features, in addition to vegetation and cultural features such as buildings
- A digital terrain model (DTM), or bare-Earth model, produced by manually editing the DSM to remove vegetation and cultural features, leaving only elevations of natural terrain features
- An orthorectified radar image (ORI) offering a high-resolution, realistic view of topographic features like rivers and road networks, which can be produced regardless of cloud cover (unlike optical satellite imagery). This is effective for detailed feature collection.
Key features and benefits:
- Current terrain data, updated continuously, allowing more accurate cross-border geospatial analysis
- Void-filled to eliminate gaps and interpolated data, allowing users to plan across large areas without worrying about seam lines or random errors
- Intermap’s IFSAR sensors penetrate clouds, smoke and haze to produce sharp, cloud-free, highly detailed images in all weather conditions
- Off the shelf country wide DTM and DSM mosaics for large projects
- The product comes on CloudEO Workbench, which gives you access to the purchased elevation data together with possibility to upload your own software to process and analyse the data, or to choose from various geosoftware on CloudEO store.
Digital Surface Model
The DSM is a topographic model of the earth’s surface that can be manipulated using a computer. Surface elevation models play a critical role in applications such as biomass studies, flood analysis, geologic and topographic mapping, environmental hazard assessment, oil and gas and telecommunications – to name a few. The DSM comprises elevation measurements that are laid out on a grid. These measurements are derived from the return signals received by two radar antennae mounted on Intermap’s aircraft. The signals bounce back from first surface they strike, making the DSM a representation of any object large enough to be resolved, including buildings and roads, as well as vegetation and other natural terrain features.
In the case of vegetation, the derived elevation data represents the scattering phase center heights. The scattering phase center height over vegetated land cover is located below the true surface height, and consequently, the surface elevation is bias downward. An understanding of the bias is required when utilizing the DSM data in, for example, biomass and canopy height calculations.
The key feature of this product is that it provides a geometrically correct reference frame over which other data layers can be draped. For example, the DSM can be used to enhance a pilot’s situational awareness, create 3D flythroughs, support location-based services applications, augment simulated environments, and conduct viewshed analyses. It can also be used as a comparatively inexpensive means to ensure that cartographic products, such as topographic line maps or even road maps, have a much higher degree of accuracy than would otherwise be possible.
Digital Terrain Model
The DTM is a topographic model of the bare earth that can be manipulated using a computer. Vegetation, buildings, and other cultural features have been digitally removed from the DTM, leaving just the underlying terrain. This is achieved using our proprietary software, which derives terrain elevations based on measurements of bare ground contained in the original radar data as well as by manually reviewing and editing every tile. In areas where spatially extensive structures or forests exist (e.g. greater than 100 meters all directions), the DTM will deviate further from the true ground elevation measurements than in areas having less surface obstructions.
The key feature of the DTM is that it infers the terrain characteristics that may be hidden in the DSM. The DTM product is a result of subtracting the measurement of the height of the majority of structures and discernable vegetation from the DSM product. The stated product accuracies will not apply to these large areas with dense canopy or structures. The DTM will be vertically accurate to 1 meter RMSE (LE90%) or better.
Orthorectified Radar Image
The ORI is a grayscale image of the earth’s surface that has been corrected to remove geometrical distortions that are a normal part of the imaging process. This product appears similar to a black-and-white aerial photograph. What differentiates an ORI from a photograph is that an ORI uses radar signals, not visible light, to produce images. As the radar waves strike the ground and return to the antennae, they also provide distance and intensity measurement data.
The key feature of this product is that it provides a means of viewing the earth’s surface in a way that accentuates features far more than is possible with aerial photography. The radar pulses are transmitted at an angle from the side of the aircraft, which casts “shadows” that enable the user to visually perceive the elevation information in the image, which appears similar to a shaded relief.
The ORI has many applications in value-added products. For example, it can be used to extract cultural features, such as road networks and buildings, and it lends itself readily to terrain, land cover, and geological analyses
Beyond the proposed bundle of DSM and DSM individual product configurations are possible. Our GeoExperts are standing by to optimize the product configuration according to your needs. Just contact us.