Environmental layers: Elevation

 
Mean altitude per 1km squareElevation data such as average, 90 percentile and 10 percentile altitude and measures of average slope within a 1km square was obtained from Ordnance Survey data distributed with the Countryside Information System. According to the CIS meta data "Topographic data created from the Ordnance Survey's digital 1:50,000 Panorama dataset in turn derived from the Digital Terrain Model data consisting of height values at each intersection of a 50m horizontal grid, the values of which have been mathematically interpolated from contours on the 1:50,000 Landranger maps."