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Digital Shoreline Analysis System version 4.3 Transects with Short-Term Linear Regression Rate Calculations for Alabama

Dates

Publication Date
Time Period
2016

Citation

Himmelstoss, E.A., Kratzmann, M.G., and Thieler, E.R., 2017, National assessment of shoreline change – A GIS compilation of updated vector shorelines and associated shoreline change data for the Gulf of Mexico: U.S. Geological Survey data release, https://doi.org/10.5066/F78P5XNK.

Summary

Sandy ocean beaches in the United States are popular tourist and recreational destinations and constitute some of the most valuable real estate in the country. The boundary between land and water along the coastline is often the location of concentrated residential and commercial development and is frequently exposed to a range of natural hazards, which include flooding, storm effects, and coastal erosion. In response, the U.S. Geological Survey (USGS) is conducting a national assessment of coastal change hazards. One component of this research effort, the National Assessment of Shoreline Change Project, documents changes in shoreline position as a proxy for coastal change. Shoreline position is an easily understood feature representing [...]

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Attached Files

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Shapefile: AL_STlrr_rates.zip
AL_STlrr_rates.dbf 18.17 KB
AL_STlrr_rates.prj 145 Bytes
AL_STlrr_rates.sbn 716 Bytes
AL_STlrr_rates.sbx 132 Bytes
AL_STlrr_rates.shp 6.11 KB
AL_STlrr_rates.shx 660 Bytes

Purpose

This dataset consists of short-term (~30-year) shoreline change rates for the Alabama coastal region from the Florida border to Dauphin Island. Rate calculations were computed within a GIS using the Digital Shoreline Analysis System (DSAS) version 4.3, an ArcGIS extension developed by the U.S. Geological Survey. Short-term rates of shoreline change were calculated using a linear regression rate where three or more shorelines exist in the dataset for the short-term time period (1960 and later). The shoreline data must cover a distance greater than 1 kilometer to be included. A reference baseline was used as the originating point for the orthogonal transects cast by the DSAS software. The transects intersect each shoreline establishing measurement points, which are then used to calculate short-term rates.

Additional Information

Shapefile Extension

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