Bathymetric Surveying

The sonar data is meshed with the GPS data and output to a PC with a readable screen. The larger screen is mounted in view of the boat operator in order to collect data in the preordained transversal lines and to ensure full coverage and avoid overlapping points. This method is very similar to what is noted as “side scan.”

A minimum of six satellites is needed to get accurate locations. The GPS and GLONASS, or Russian constellations, are used together to get a larger number of satellites to work in confined and obstructed areas. Where the overhead is too obstructed for GPS data, Direct Read Survey Instrument or traditional Instrument & Prism will be used to gather the data.

The data is given to a CAD Operator to inspect the field data for errors or omissions. A topographic map will be provided with one foot or two foot contours. The contour map is not used for calculations, but this is where any problems can be identified. The finished contour map is inspected by the field crew before it is completed and a .PDF and CAD file will be provided.

Accuracy
Within 0.1’ – 0.3’ depending on heavy vegetation

Bathymetric Equipment

• Topcon Hyper GPS System
• Trimble S-6 Total Station; fully robotic
• 12’ Smoker Craft Aluminum boat equipped with an on-board computer
• Panasonic U-1 Toughbook PCs
• Carlson embedded with AutoCad