There are three ways of viewing old maps of Harby on this website. In one, the maps are superimposed on more modern mapping, with a slider you can use to vary their transparency. In the second, old and new maps are displayed side-by-side on a split screen, with the position of the mouse cursor displayed as a cross on the second map to allow detailed comparison. The third option allows interactive modification of the parameters used to image lidar data from the area; the dynamic lidar image is overlaid on a choice of background map, which can be revealed using the transparency slider. The map viewers can be toggled to and from fullscreen mode by clicking on the icon in their top right hand corner. If a map doesn't display when selected, try zooming out until it does and then zooming back in again.