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The depth and shape of the seabed, known as the bathymetry, is collected using a multi-beam echosounder (Reson 7125). The system provides detailed information on the seabed bathymetry. The system is georeferenced using an Applanix POS MV(tm) and Fugro STARFIX DGPS. Daily water column profiles were recorded using a sound velocity probe. Tide gauges (RBR DR-1050) were also deployed for the duration of the cruises to enable tidal corrections. Survey transect lines were spaced to ensure >50% overlap between adjacent lines for most of the areas to maximise the coverage of the area surveyed. However, 10% or less overlap was applied to certain sites where there was limited survey time and space. Typically, 8 knots was maintained in open water for 60 m or less however, sites greater than 60 m were surveyed at speeds of 4 knots.

Pentland Firth bathmetry

Software Requirements

Processing bathymetric data requires specialised software. However, once processed, 3D bathymetric data can be viewed using the free software packages;

- iView4D - reads SD files or,
- Easy View - reads CSAR files

2D bathymetric surfaces can also be read using professional GIS programmes or one of the following two programmes available for free;

- ArcGIS Explorer - reads ArcGIS layer packages, SHP files and Geotiffs
- Google Earth - reads KML or KMZ files.

bathymetry image

Click the image to access a layered .pdf version of the map

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