Merrett Survey Limited is proud to be involved with any project where the preservation of the World’s heritage sites can be enabled or improved through the application of the latest measurement and recording technologies. These include laser scanning, high quality HDR (High Dynamic Range) imagery and photogrammetry.
Our heritage project experience is wide ranging and includes surveying historic castles, churches, bridges, piers, churches, chimneys, breweries, hotels and more.
One recent project involved surveying an historic bridge (see image at top of this page) and producing ‘stone by stone’ 2D elevations of the structure as well as a 3D model and high resolution ortho-images. Locally, we have surveyed many fire damaged cob buildings to enable their reconstruction. In Redruth, Cornwall, we surveyed a listed brewery building and provided a BIM model as the building is to be converted into an archive / history resource centre. This project also required a verticality analysis of the historic chimneys and walls. The chimney survey included use of a UAV / drone.
“We appointed Merrett Surveys to provide laser scanning and verticality analysis and have been impressed by their helpful, pro-active approach, and the quality of their produced information on what is a complex and challenging project.”
Senior Architect, Purcell,
When surveying an historic building, we deploy laser scanning technology as when using traditional methods, recording the irregularities within such structures can be
impossible or extremely time consuming. Laser scanning and the drawings derived from it reveal the full irregularities within an historic building. Rooms are seldom
anywhere near square, floors are rarely level and walls are invariably out of plumb. The use of laser scanning also reduces the need for site revisits. The high level of
detail obtained though scanning provides designers and archaeologists with the fullest information needed to study and preserve the heritage fabric. Where direct line of sight to a feature is not possible, additional measurements will be made using total stations, disto or tape. Wherever possible, non-contact instruments are preferred.
When surveying an historic building, our surveyors take great care not to cause any damage to the building fabric. Targets are not adhered to delicate surfaces using tape
or glue. In fact, we use statically charged targets or targets mounted on camera tripods. We also use tripods with rubberised feet so as to avoid any damage caused by spiked survey tripods.
We have been called upon to use airborne Lidar to search for historic features ranging from World War 1 trenches to iron age settlements.
Jersey Castle – survey for wall movement
Laser scan of 400 year old fire damaged
buildings – to aid their reconstruction
Scan of last timber rail bridge in UK for