**9. Man-made maintenance forethought**

A slightly more academic exercise was carried out for the Elizabeth Castle in St. Helier because the custodians of the Castle, Jersey Heritage, required a 'resilience study' of the major elements of the Castle complex (**Figure 17**, Ref. [9], Vid Ref. [4]). In addition to a full photographic record, drone surveys were used to visually access the very high inaccessible castle walls on the rock outcrop to examine the masonry and to have a full record of the large number and variety of different era structures that make up Elizabeth Castle complex (**Figure 18**, Ref. [9], Vid Ref. [4]).

**Figure 17.** *The area to be scanned of the St. Helier breakwater.*

#### **Figure 18.**

*Drone survey of area to be scanned by LiDAR for the Elizabeth Castle, St. Helier breakwater. (Screen shot of LiDAR castle fly over, reference video ….). (Link to video materials is available at the end of the chapter).*

The Jersey Heritage Board were concerned that the annual vintage airplane display and fly past for celebrating the Battle of Britain in Jersey flew directly over the castle complex from the St. Aubins Bay in the south. The CEO of the organisation needed to know what the scale of the damage would be should any one of these ancient aircraft fall and impact on some of the priceless Heritage buildings. This included St. Helier's Chapel itself dating from 555 AD which was directly in the flight path of the display (**Figure 19**, Ref. [9], Vid Ref. [4]). The evidence from the study was then used to justify the organisers of the display in to changing the flight path away into a different direction in the Bay to safeguard the Heritage buildings (**Figures 20**–**22**).

*Digital Technology to Preserve Heritage Structures DOI: http://dx.doi.org/10.5772/intechopen.99023*

**Figure 19.** *Helier chapel from 555 AD in the flight path.*

**Figure 20.** *From the shore the aerial fly past display over Elizabeth Castle.*
