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Vector Shorelines and Associated Shoreline Change Rates Derived from Lidar and Aerial Imagery for Dauphin Island, Alabama: 1940-2015

By Rachel E. Henderson, Paul R. Nelson, Joseph W. Long, and Christopher G. Smith

Summary

In support of studies and assessments of barrier island evolution in the Gulf of Mexico, rates of shoreline change for Dauphin Island, Alabama, were calculated using two different shoreline proxy datasets with a total temporal span of 75 years.  Mean High Water line (MHW) shorelines were generated from 14 lidar datasets from 1998 to 2014, and Wet Dry Line (WDL) shorelines were digitized from ten sets of georeferenced aerial images from 1940 to 2015. Rates of change for the open-ocean (south-facing) and back-barrier (north-facing) coast were calculated for three groups of shorelines:  MHW (lidar), WDL (aerial) and MHW and WDL shorelines combined. Calculations were performed using the Digital Shoreline Analysis System (DSAS) version 4.3, an ArcGIS extension developed by the U.S. Geological Survey (Thieler and others, 2009).  

Thieler, E.R., Himmelstoss, E.A., Zichichi, J.L., and Ergul, Ayhan, 2009, Digital Shoreline Analysis System (DSAS) version 4.0—An ArcGIS extension for calculating shoreline change: U.S. Geological Survey Open-File Report 2008-1278, https://woodshole.er.usgs.gov/project-pages/DSAS/version4/.

Data

File Name and Description Metadata (XML format) Metadata (text format) Download File
Lidar_Shorelines_1998_2014.zip
Polyline shapefiles of Mean High Water (MHW) shorelines extracted from lidar elevation data from 1998–2014.
Lidar_Shorelines_metadata.xml Lidar_Shorelines_metadata.txt Lidar_Shorelines_1998_2014.zip
(2.9 MB)
Aerial_Shorelines_1940_2015.zip
Polyline shapefiles of Wet Dry Line (WDL) shoreline delineated from historical aerial imagery from 1940–2015.
Aerial_Shorelines_metadata.xml Aerial_Shorelines_metadata.txt Aerial_Shorelines_1940_2015.zip
(2.9 MB)
Transects_OpenOcean.zip
Polyline shapefiles of DSAS generated shore normal transects for the open-ocean shoreline of Dauphin Island, with associated rates of change for three shoreline analyses: Lidar shoreline change (1998–2014), Aerial shoreline change (1940–2015), and combined Lidar and Aerial shoreline change (1940–2015).
Transects_OpenOcean_metadata.xml Transects_OpenOcean_metadata.txt Transects_OpenOcean.zip
(518 KB)
Transects_BackBarrier.zip
Polyline shapefiles of DSAS generated shore normal transects for the back-barrier shoreline of Dauphin Island, with associated rates of change for three shoreline analyses: Lidar shoreline change (1998–2014), Aerial shoreline change (1940–2015), and combined Lidar and Aerial shoreline change (1940–2015).
Transects_BackBarrier_metadata.xml Transects_BackBarrier_metadata.txt Transects_BackBarrier.zip
(376 KB)
Baseline_OpenOcean.zip
Open-ocean offshore baseline for generating shore-normal transects in DSAS.
Baseline_OpenOcean_metadata.xml Baseline_OpenOcean_metadata.txt Baseline_OpenOcean.zip
(65 KB)
Baseline_BackBarrier.zip
Back-barrier offshore baseline for generating shore-normal transects in DSAS.
Baseline_BackBarrier_metadata.xml Baseline_BackBarrier_metadata.txt Baseline_BackBarrier.zip
(66 KB)

Regional map of the northern Gulf of Mexico highlighting the study area of Dauphin Island, Alabama.
Figure 1. Regional map of the northern Gulf of Mexico highlighting the study area of Dauphin Island, Alabama.

Suggested Citation

Henderson, R.E, Nelson, P. R., Long, J.W., and Smith, C., 2017, Vector Shorelines and Associated Shoreline Change Rates Derived from Lidar and Aerial Imagery for Dauphin Island, Alabama: 1940-2015: U.S. Geological Survey data release, https://doi.org/10.5066/F7T43RB5.

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