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Coast to coast

A new mapping system enables engineers to plot sea depth around the entire UK coastline. This helps with habitat mapping, risk management and decision making. NCE reports.

Marine geographic information provider SeaZone is now offering full UK coastal coverage of TruDepth Grids which provide the best available information on water depth around the UK. The latest areas to be produced are along the East Coast from the Scottish Borders to the Wash, the Isle of Man and offshore Cornwall.

SeaZone TruDepth Grids are used by many organisations including government, energy companies, universities, research institutions, and consultants. They are used for marine spatial planning, site selection, habitat mapping, volumetric calculations, nutrient loading models, capacity planning and general bathymetry background mapping.

The data can be incorporated with most GIS and modelling software.


Users of SeaZone TruDepth Grids report many benefits. These include data procurement cost savings, time savings, reduced project risk, better support for decision making and more accurate modelling.

TruDepth Grids are created from a digital terrain model (DTM) based on the best available surveys (for example best sounding density and most up to date surveys) that are held in SeaZone’s bathymetry database. The SeaZone database includes around 20,000 survey blocks, 500 of which have been scanned, geo-referenced and digitised from UK Hydrographic Office’s archive fairsheets.
Charted bathymetric data is acceptable for background mapping and coarse scale generic assessment, but for

accurate design, engineering and numerical modelling, it is unadvisable to use charted data.
SeaZone says that physical features such as trenches, ridges, sand banks and sand waves are significantly more distinguishable with TruDepth Grids.

The grids are available in half degree (approximately 100km) tiles in ASCII Grid and ESRI Binary Grid formats. They are referenced to Chart Datum but can be transformed to other vertical references by SeaZone.

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