“…Usually these studies measure rates over a two-year period, although recent studies have also used these instruments to monitor rates of surface change over a few days or a few hours (e.g. Stephenson et al, 2004;Trenhaile, 2006;Gómez-Pujol et al, 2007;Hemmingsen et al, 2007;Porter and Trenhaile, 2007). Uniquely, Stephenson et al (2010) have used the same method to measure surface height change on a number of shore platforms over a 10-year period.…”