Note: the faint north–south stripes are not real features; they come from small height differences where neighbouring survey flight strips overlap.
This map compares two Environment Agency LiDAR surveys of the Stonehenge landscape, from 2001 and 2021. The coloured layer is the 2021 ground height minus the 2001 height. The surveys were lined up on roads and other hard surfaces, and the result was smoothed over 5 m.
Blue areas are lower now and red areas are higher. The fine stripes left by ploughing in 2001 have gone where fields were put back to grass. No new earthworks show up. Changes of a few centimetres sit close to the limits of the data, so treat small patches with caution.
Use the box at top left to change the base map: LiDAR hillshade, Esri aerial photos (current or older Wayback releases) or historic Ordnance Survey maps from the National Library of Scotland. The 25-inch map shows from zoom 14. Wayback dates are release dates, not the dates the photos were taken.
LiDAR: Environment Agency (2001 survey; 2021 National LiDAR Programme), © Environment Agency, Open Government Licence v3. Scheduled monuments: © Historic England (National Heritage List for England), OGL v3. Aerial imagery: © Esri, Maxar, Earthstar Geographics and the GIS User Community. Historic maps: reproduced with the permission of the National Library of Scotland (CC-BY). Map viewer: Leaflet. Area: SU1035 and SU1040 (E410000–415000, N135000–145000).