Survey control was put in using a static GPS receiver to allow the survey to be referenced to Ordnance Survey grid and level datum. RTK (Real Time Kinetic) GPS was then used to record the interior valley sections of the roof, picking up the edge of roof tiles and valley levels. GPS was also used to record the top of the church tower and parapet levels (see photo below). A traverse was then carried out, using a total station theodolite, around the building picking up the ground survey and elevation details together with eave and ridge heights. A full interior survey was carried out on the same grid. The resulting data was then processed in order to produce a floor plan, site plan, full set of exterior elevations and interior elevation long & cross sections.