Products

DTM — Digital Terrain Model

Bare-earth 3D model with trees, buildings and other surface features removed or interpolated through.

elevation60 m30 m10 m0DTMremovedremovedremovedCROSS-SECTION · DTM (BARE-EARTH MODEL)use: hydrology · flood modelling · earthworks · grading · drainage design
Fig. 1 DTM (Digital Terrain Model) strips above-ground features — trees, buildings, infrastructure — to recover the bare ground elevation. Same landscape as the DSM comparison, rendered with surface features removed and the hidden ground surface interpolated through.

A DTM is a raster where every pixel value is the elevation of the bare ground — vegetation, buildings, and other above-ground features have been removed or interpolated through. More processing and usually more source data than a DSM, because we are inferring what is under the canopy.

When to use

Hydrology, flood modelling, grading, earthworks, anything where you care about the ground itself rather than what sits on top of it.

Pricing

Priced separately from imagery, case-by-case. More expensive than a DSM because of the additional canopy-penetration processing required.