Chalk cliff retreat lines East Sussex (1624, 1764), 1870s, 1973, 1999, 2020
Cliff lines digitised from rectified historic maps (1870s and earlier) and for 1973, 1999 and 2020 from ortho-rectified aerial photography.
Steps to reproduce
digital aerial photography flown on 04-07-1973, 15-07-1999, 15-09-2020 with a ground resolution of 0.1m per pixel was orthorectified using Metashape Pro (Agisoft, 2021) following the standard workflow and GNSS collected ground control points. Aerial photography available from https://coastalmonitoring.org/