Seasonal Shoreline Change Near Masset, Haida Gwaii from 2007 to 2022

32 manually digitized shoreline shapefiles capture the coastline near Masset, British Columbia, twice annually in April and October. Madison Power created this dataset to investigate shoreline position changes over a 15-year period using the U.S. Geological Survey's Digital Shoreline Analysis System (DSAS). The seasonal shorelines were derived from Landsat 7 and 8 panchromatic imagery, using the water-land interface as a proxy.

Use Cases

• Calculate rates of coastal erosion and aggradation based on the 30-meter spaced transects extending from the onshore baseline.
• Model seasonal shoreline envelopes based on the biannual (April and October) digitization to capture winter and summer conditions.
• Validate remote sensing shoreline proxies by comparing the manually digitized water-land interface from Landsat imagery.
• Apply the Digital Shoreline Analysis System (DSAS) methodology to a new geographic area using the provided shapefiles and transects.

Strengths

• Includes 32 shoreline shapefiles providing a detailed temporal series.
• Covers a specific 15-year time range from 2007 to 2022.
• Features seasonal sampling (twice annually) designed to capture maximum erosion and aggradation rates.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Row count is unknown, which may limit suitability assessment for certain analyses.

Provenance

Source

Borealis Harvested Dataverse

Collection Method

Manual digitization of shorelines from Landsat 7 and 8 panchromatic imagery.

Time Range

2007 to 2022

Freshness

Last updated 2025-10-13 01:32:27; freshness should be verified.

Geography

Northeastern Haida Gwaii, near Masset, British Columbia, Canada