Shorelines were digitized from high-resolution imagery spanning the last several decades: Average rates of coastal change are in meters per year for erosion (loss of land, with negative rates) or accretion (growth of the beach, with positive rates):
Shoreline features were precisely surveyed with Differential GPS in recent years:
Average rates for coastal change are in meters per year, with erosion (loss of land) or accretion (growth of the beach):
