Marine Themes Digital Elevation Model (DEM) is our seabed surface model, comprising detailed and accurate data of the seabed. The dataset utilises the most recent commercial single and multi-beam survey and lidar data available. A coverage layer is also provided to ensure the source of the data is always clearly defined.

All available surveys are assessed and carefully selected in a deconfliction process. The model is designed to be read directly into GIS, with an attributed coastline that improves accuracy at the coastal boundary. An enhanced interpolation method is used to produce a contiguous, natural representation of the seabed.

The dataset is available at two spatial resolutions: 1 arc second tiles (0.5‑degree) and 6 arc second tiles (2‑degree). A dedicated coverage layer is also provided, detailing the underlying data sources used in constructing the model.