Created from open LiDAR data https://data.gov.uk/

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3D videos at https://www.youtube.com/playlist?list=PLeZH6zvJosTn9X_W5lyCODIqp63hpVhpT
3D models at https://sketchfab.com/hillforts/collections/britain-hillforts-5e1db9c659aa49efa07ad20c1f185019