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[…]

Changing Wrecks – Which Version?

Things Change Shipwrecks are not static, unchanging places. As age, tide and corrosion take their toll things settle into the seabed. Prior to photography, and more recently photogrammetry, the changes would go unrecorded. But as those of us who dive the SMS Karlsruhe regularly, it is no longer possible to recreate this image as shot Read more about Changing Wrecks – Which Version?[…]

Mixing Datasets – Photogrammetry and Multibeam

The one nagging thought while scanning is “Did I get enough overlap?”. No overlap of points and the scan data just won’t build into a single, seamless model. For anyone scanning topside data the opportunity to reshoot the missing images can be straightforward, but with shipwrecks its not so easy. The distances involved, boat availability Read more about Mixing Datasets – Photogrammetry and Multibeam[…]