Raster Charts are georeferenced nautical chart image files for use in GIS. They provide a familiar, cost-effective nautical chart basemap and can be ordered directly from our Mapdata Marine online shop.

Marine Themes comprises authoritative data from the UK and other best available sources, engineered into logical data layers for easy loading and efficient use in GIS. This makes for comprehensive, flexible and intelligent marine mapping at an attractive price.

Raster Charts XL are derived from raster-based material obtained under licence from the UK, and other, Hydrographic Offices where land and other non-marine features have been removed. This provides familiarity for users who work with nautical charts and has the advantage of being able to combine it with any land mapping, or aerial imagery, of your choice. Raster Charts XL coverage is available depending on permissions granted by contributing nations worldwide.

Marine Themes Digital Elevation Model (DEM) comprises a gridded (raster) dataset of seabed elevation relative to a specified datum. The surface has been created from hydrographic survey and chart derived data depending on the data available for a particular area and has a resolution of 1 and 6 arc seconds, which is approximately 30 and 180 m, respectively. The 1 arc second DEM is provided as individually named half degree tiles and the 6 arc second as individually named two degree tiles. Depending on the resolution of input data the 1 arc second DEM is not available for all areas. Data can be supplied in a variety of digital formats.