| Word | Description |
| DEM | Digital Elevation Model: a gridded surface of height values |
| DTB | Depth To Basement: often presented as a continuous grid surface of cell values, each cell value representing the interpolated depth to basement at that point. Typically this grid has been interpolated from drillhole information. |
| DTM | Digital Terrain Model: a gridded surface of height values |
| DXF | Drawing Exchange Format |