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NEXTMap digital elevation models (DEMs) provide seamless, wide-area, and current terrain data so you can perform more efficient geospatial analyses. Our world-class enterprise workflow allows us to integrate elevation datasets from around the world to provide best-of-breed elevation models with a range of accuracies starting at 1 vertical meter LE90% (Linear Error at the 90 percentile) in unobstructed terrain of low slopes. NEXTMap DEMs include:
Digital surface model (DSM) – a first-reflective-surface model that contains elevations of natural terrain features in addition to vegetation and cultural features such as buildings. The key benefit of the surface model is that it provides heights of features above the ground, enabling line-of-sight and viewshed analyses for industries such as telecommunications and forestry.
Digital terrain model (DTM) – a bare-earth elevation model that contains heights of natural terrain features, such as barren ridge tops and river valleys. Elevations of vegetation and cultural features, such as buildings and roads, are digitally removed. The key benefit of the terrain model is that is provides a surface for contour generation for applications such as base, geologic, and topographic mapping.
Our NEXTMap DTM and DSM are available in two versions:
Hydro-enforced DEMS – structures over water bodies (such as bridges and culverts) are removed, water surfaces are flat, and watercourses flow downstream – making them ideal for water resource and floodplain management applications.
Ortho-ready DEMs – bridge decks and culverts are maintained in the elevation models, and major roads are smooth to accommodate the use of the DEMs in orthorectification of optical images.