The purpose of this study was to determine threshold of abrasion rate at coastal area of Angso Duo Island, Pariaman City, West Sumatera, using sediment analysis and image data processing in February 2017. The samples of coastal sediment was collected at four stations in the study area. The change of coastline was observed by using Landsat 5 TM (year 1996 and 2006) and Landsat 8 LDCM (year 2016)…