Gone But Not Forgotten.

Gone Late last week a tanker in Weymouth Bay managed to snag a torpedo on its anchor. Royal Navy divers from the Southern Diving Unit dealt with the problem torpedo and a link to the full story is here. The torpedo in question is almost certainly one of Grahame Knott’s Deeper Dorset finds. The torpedo Read more about Gone But Not Forgotten.[…]

Can We Take a Closer Look?

Deadlines and Detail Having masses of data is a double edged sword. Too little and your images won’t align or your models lack definition. Too much and processing time jumps exponentially. Its always a balancing act between a desire for detailed models and the time available. When The Thistlegorm Project team decided to launch the website on Read more about Can We Take a Closer Look?[…]

Photogrammetry – Addictive?

This week I am back in Egypt to present the work of scanning the SS Thistlegorm to the Ain Shams and Alexandria universities. The SS Thistlegorm work will be launched on the 6th of October 2017 which coincides with the anniversary of the sinking of the ship. A trailer of what is to come can Read more about Photogrammetry – Addictive?[…]

Bolt in the Bay – P47-D Crash Site

Background A few years back Grahame Knott of Deeper Dorset found the dispersed remains of an aircraft in Weymouth Bay. Over the years pieces of the jigsaw have come together, with pieces of information as diverse as component part numbers and an entry in the Portland War Diary (Held at the National Archives)  all adding up to Read more about Bolt in the Bay – P47-D Crash Site[…]

Project Thistlegorm – The Processing Begins

The Project The SS Thistlegorm is rated a world class wreck dive. But only a tiny fraction of the world can don SCUBA and pay the wreck a visit, so the Universities of Nottingham, Ain Shams and Alexandria have collaborated to digitally record the heritage beneath the waves. Funding for this work has been provided by Read more about Project Thistlegorm – The Processing Begins[…]

The Art of DEM

The Art of DEM For some reason, I am drawn to Digital Elevation Models (DEM). They express so much information in such an elegant way. Their creation does require embedding GPS data, but thats almost a given these days as its a straightforward exercise pulling points out of sonar. In simple terms, a DEM is Read more about The Art of DEM[…]

Geo Referencing the UB 116

Earlier this week Kevin Heath of Sula Diving kindly towed his sides can sonar fish past the remains of the UB 116, generating a very clear image of the wreck site: Relating the Model to the Planet With the GPS positions recorded in the sonar we can now extract a few key points and add them to Read more about Geo Referencing the UB 116[…]

Decimating the Model – the V83

Scapa Processing Continues What seems like an age ago we were in Scapa Flow diving from the good ship MV Valkyrie. Some of the models were completed on board – like the discovery of a German Pinnace whereas others such as the UB 116 took a little longer. Near the end of the list of wrecks to process is the Read more about Decimating the Model – the V83[…]

Tidal Streams and Photogrammetry

A New Target Last week The Shipwreck Project surveyed and confirmed another sonar target. Before diving and upholding a long-held Project ritual, the lump was christened “The Block Of Cheese” on account of what it looked like on the sonar. Here’s a screen grab of what we were looking at: The Scan The target was quickly confirmed Read more about Tidal Streams and Photogrammetry[…]

Photogrammetry – Managing the Data

How much? Photogrammetry produces a lot of data. Here’s a walk-through of the kind of volume needed to create the High Seas Fleet pinnace found last month in Scapa Flow:- Volume of data by event From beginning to end we have:- Dive – 598 RAW files = 15.32Gb Initial processing – 598 derived JPEG images Read more about Photogrammetry – Managing the Data[…]