bathymetric survey Tonga

The Case of the Missing Shipwreck

One of the most surprising and interesting finds our bathymetric survey company during our recent major survey of the Niue region, was a shipwreck.  One that was on the move! To be fair the sunken ship had originally been discovered and charted long before we all arrived. The ‘Nicky Lou’, an Albacore fishing vessel, ran…

Read More
dimensional control survey

The Most Accurate Method of Dimensional Control

Conducting a dimensional control survey of survey vessels is one of the first tasks we undertake when commencing a hydrographic survey. The conventional method of measuring offsets using a tape only provides accuracy to within about 50mm. iXblue uses a dimensional control process as it provides far greater accuracy – to within 1-2mm and achieve…

Read More
hydrographic survey target detection test

Hydrographic Survey – Target Detection Testing Process

Some of our clients request proof of the multi-beam echo sounder’s target detection performance. Senior Surveyor Dave Mundy of iXblue explains the process, which involves ground troofing of the multi-beam against a physical object of known dimensions.  He demonstrates the process, whereby a pre-fabricated one metre cube is lowered to the sea floor at approximately…

Read More
gps base station

Why Use a GPS Base Station During a Hydrographic Survey?

When conducting inshore hydrographic surveys, particularly in areas where there are steep cliffs, or where GPS coverage can be patchy, it’s important to ensure the horizontal and vertical components of GPS data are accurate. Senior Surveyor Rhys Davies explains how iXblue sets up an on-shore GPS base station, how often it logs, and the process…

Read More
Coastline Charting

The Coast Lining Verification Process

How are coastline charts updated?  Senior Surveyor Owen Friedleib, from iXblue, explains the coast lining verification process undertaken on hydrographic surveys.   Firstly, we digitise available aerial or satellite imagery of coastline features onto existing charts of the area we will be surveying.  Then when we’re in the field, we verify the existing and any…

Read More