**7. Manmade destructive influences**

The deterioration of Heritage monuments due to manmade problems, for example at La Hougue Bie which is a Neolithic burial mound and tomb on the island *Digital Technology to Preserve Heritage Structures DOI: http://dx.doi.org/10.5772/intechopen.99023*

#### **Figure 12.**

*LiDAR scan of burial mound entrance. Screen shot of mound entrance and film. Ref [12]. (Link to video materials is available at the end of the chapter).*

of Jersey (**Figure 12**, Ref. [12], Vid Ref. [3]), also prompted a LiDAR scan and model of the whole site. In the course of recent history, trees had been planted on to the burial mound and there was great concern that the mound was slowly being destroyed by tree roots growing ever larger and into the mound. So its digital preservation for the current and future generations was recorded and the finished model has a fly-through and around the mound, as well as recording the 12th century chapel on the top of the mound (**Figure 13**, Ref. [12], Vide Ref. [3]) and even into and around the burial mound itself (**Figure 14**, Ref. [12], Vid Ref. [3]).

#### **8. Man-made mistakes**

The nearby Gorey Castle East Gate area was also damaged by manmade interventions because to accommodate tourist parking to visit the Gorey harbour and

**Figure 13.** *Photograph of burial mound with trees (and not a real mammoth!), Ref. [12], Vid Ref. [3].*

**Figure 14.** *Spectacular LiDAR fly through into chamber. Screen shot and film, Ref. [12], Vid Ref. [3].*

Castle, excavations were carried out to create more car parking space adjacent to the Castle entrance (**Figure 15**, Ref. [10], Vid Ref. [2]). However, the works were excavated too close to the East Gate of the Castle and undermined the wall close to, and beneath this gate. The resulting movement and cracking in the masonry was significant but was also difficult to assess and map conventionally but with the use of the LiDAR model the engineering team was able to design repairs (**Figure 16** Ref. [10], Vid Ref. [2]).

LiDAR was used to accurately record the surface of the structure's masonry shape and to map the cracks so as to identify what parts of the masonry had moved

**Figure 15.** *LiDAR area of high density focus for accuracy. Show red line cracks.*

**Figure 16.** *Drone survey of castle. Target area for LiDAR. Screen shots and survey video of castle, Ref. [10], Vid Ref. [2].*

and by how much. This type of heritage masonry is very difficult to draw conventionally but the high intensity LiDAR scans produce accurate drawings that not only provide an archive but also very good visual records of this type of historic masonry structure and when and where it was repaired.
