These contours were then interpolated into a 20 meter raster array. The white areas are the highest elevation, with Mt. Buevray in the upper left. The hillforts are the white areas along the river valley which is the dark area in the center. In the middle is the aspect, or direction of slope face map. On the right is a slope map, showing the steepness of the slope.
Flat areas are yellow and orange, steep slopes are pink and blue.
The river bottomlands are clearly visible in yellow. Numerous derived data layers have also been created. These are created by processing basic data layers with operations such as distance zones, etc. The field survey segments are visible at left, along with archaeological sites from different periods. This analysis shows clearly that the Celtic roads definitely tend to follow paths that stay within the view of the hillforts, even if they are less direct or require a steeper climb.