New techniques for measuring cliff change from historical photographs
U.S. Geological Survey scientists and their coauthors from the California Coastal Records Project have found a way to use historical aerial photographs to accurately measure coastal erosion. Applying a low-cost technique called “structure-from-motion” to five sets of oblique aerial photos spanning the years 2002 to 2010, the scientists measured the volume of material eroded from coastal cliffs at Fort Funston, on the westernmost edge of San Francisco. Their results were published October 21, 2016 in the Journal of Coastal Research. Quantifying coastal change is essential for calculating trends in erosion, evaluating processes that shape coastal landscapes, and predicting how the coast will respond to future storms and sea-level rise, all critical for communities along the California coast.