Arctic coastlines are distinguished by the effects of ice, both sea and ground ice, on coastal change. The sensitivity of the coastline to changes in sea level and environmental forcing vary depending on changes in sea ice duration, extent and thickness, and to decreases in ground ice content accompanying warming. Through their effect on sea surface height relative to the coastline, both influences have the potential to increase erosion rates. The Arctic Circumpolar Coastal Observatory Network (ACCOnet) Remote Sensing Baseline is seeking to establish a standardized remote sensing dataset for more than 41 sites along the Arctic coasts, including 24 key observatory sites of the Arctic Coastal Dynamics (ACD) project of the Land-Ocean Interactions in the Coastal Zone programme of the IGBP-IHDP.