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Digital Shoreline Analysis System version 4.3 Transects with Short-Term End Point Rate Calculations for Louisiana

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: LA_STepr_rates.zip
LA_STepr_rates.cpg 5 Bytes
LA_STepr_rates.dbf 175.14 KB
LA_STepr_rates.prj 145 Bytes
LA_STepr_rates.sbn 7.59 KB
LA_STepr_rates.sbx 252 Bytes
LA_STepr_rates.shp 69.96 KB
LA_STepr_rates.shx 6.45 KB

Purpose

This dataset consists of short-term (~30-year) end point shoreline change rates for the Louisiana coastal region from the Chandeleur Islands to Raccoon Point, on Isles Dernieres at the mouth of Caillou Bay, where fewer than three shoreline positions were available for the short-term time period (1960 and later). 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. The two shorelines 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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