Having finished most of the mapping and recording of the western side of the wreck yesterday, today we have focused our efforts on the eastern side. In order to map this part of the wreck site we first placed more coded targets before shooting additional video footage for photogrammetry modelling. After every part of the site had been accurately documented, selected timbers were then chosen for dendro sampling.
Dendro sampling also continued on the western part of the site, where our divers faced the time consuming challenge of sawing through the massive keel timber.
There were also some other suitable planks for dendrochronology scattered across the wreck site so we’ve spent most of the day selecting and bringing up more dendro samples.
Our final diving day was devoted mainly to ensuring we didn’t miss any measurements or critical construction features and lastly cleaning the site. The coded targets were carefully removed and the last dendro samples were lifted and stored. We have left most of the datum points (numbered points for the basic measurements on site) on sites for future reference measurements.
Back on deck we made sure a full backup of all our data was made; over the course of two weeks no less than 330GB of video footage was recorded. In the following weeks this data should allow us to make an accurate digital 3D reconstruction of both wreck locations.
We finished diving at noon so we could weigh anchor and sail the work barge back to the shore where it will be picked up tomorrow.
The work has finished here. We go back to Amersfoort to process the data and do some further research on the material we gathered. The 3D photogrammetry that we have used to map the OVM 10 and 12 will make this work probably much easier!
Next fieldwork in the Netherlands starts on the 17th August 2015, check our Blog for news on that. In the meantime please keep on following the capacity building project in Vietnam.
Morrison van der Linden (student)
Martijn Manders (Head of the Maritime Programme)