Seasonal shoreline change in northeastern Haida Gwaii dataset

This dataset comprises 32 manually digitized shoreline shapefiles representing the coastline near Masset, in northeastern Haida Gwaii, British Columbia. It also includes an onshore baseline and a series of transects spaced at 30 m intervals extending seaward from the baseline. These data were used to analyze shoreline position changes using the U.S. Geological Survey's Digital Shoreline Analysis System (DSAS).
This dataset was used to investigate shoreline change between Masset and the Sangan River over a 15-year period from 2007 to 2022. Shorelines were digitized twice annually, in April and October, to capture the end of winter and summer conditions, respectively. These seasonal envelopes allowed for investigations into maximum rates of erosion and aggradation.
The seasonal shorelines were digitized using Landsat 7 and 8 panchromatic imagery, where the water-land interface was used as the shoreline proxy.