DIGITAL SHORELINE ANALYSIS SYSTEM

Computer Software for Calculating Shoreline Change (or any issue dealing with the positional change of a boundary over time)

The Digital Shoreline Analysis System (DSAS) is a software extension to Esri ArcGIS v.10 that enables a user to calculate shoreline rate-of-change statistics from multiple historic shoreline positions. A user-friendly interface of simple buttons and menus guides the user through the major steps of shoreline change analysis. Components of the extension and user guide include instruction on the proper way to define a reference baseline for measurements, automated and manual generation of measurement transects and metadata based on user-specified parameters, and output of calculated rates of shoreline change and other statistical information.

DSAS transect lines DSAS transect lines

DSAS generates transects that are cast perpendicular to the reference baseline at a user-specified spacing alongshore.  The distance between the baseline and each shoreline intersection point on DSAS transect can be used to calculate the following change metrics:

Distance measurements:
  • Shoreline Change Envelope
  • Net Shoreline Movement

  • Statistics:
  • End Point Rate
  • Least Squares Regression
  • Weighted Least Squares Regression
  • Supplemental statistics for Least and Weighted regression
  • Confidence Interval
  • Standard Error
  • R-squared
  • The results of all rate calculations are output to a table that can be linked to the transect file by a common attribute field. DSAS is intended to facilitate the shoreline change-calculation process and to provide rate-of-change information and the statistical data necessary to establish the reliability of the calculated results. The software is also suitable for any generic application that calculates positional change over time, such as assessing change of glacier limits in sequential aerial photos, river edge boundaries, or land-cover changes.



    Current Version for ArcGIS 10.4 and 10.5

    DSAS version 4.4 was released in July 2017 and is available here. That link also provides an option to download DSAS version 4.3 for ArcGIS 10.3 and earlier and version 4.2 for ArcGIS 9.x (scroll down for older versions).  Please note that DSAS version 4.2 is not compatible with Windows 7 operating systems. If you have questions on the timing of an update or want to be notified when one is made available, please contact DSAS_help@usgs.gov

    Suggested Citation

    Thieler, E.R., Himmelstoss, E.A., Zichichi, J.L., and Ergul, Ayhan, 2017, Digital Shoreline Analysis System (DSAS) version 4.0—An ArcGIS extension for calculating shoreline change (ver. 4.4, July 2017): U.S. Geological Survey Open-File Report 2008-1278, https://pubs.er.usgs.gov/publication/ofr20081278

    Version History

    This text file documents the version history for the most recent publication (DSAS version 4.x).

    Previous Versions (unsupported)

    DSAS 4.3 for ArcGIS 10-10.3 remains available here (scroll down below current version) and should be cited as: Thieler, E.R., Himmelstoss, E.A., Zichichi, J.L., and Ergul, Ayhan, 2012, Digital Shoreline Analysis System (DSAS) version 4.0—An ArcGIS extension for calculating shoreline change (ver. 4.3, April 2012): U.S. Geological Survey Open-File Report 2008-1278

    The DSAS 4.2 for ArcGIS 9.x is not compatible with Windows 7.  It remains available here (scroll down below current version) and should be cited as: Thieler, E.R., Himmelstoss, E.A., Zichichi, J.L., and Ergul, Ayhan, 2010, Digital Shoreline Analysis System (DSAS) version 4.0—An ArcGIS extension for calculating shoreline change (ver. 4.2, August 2010): U.S. Geological Survey Open-File Report 2008-1278

    The DSAS 4.0 is available at https://woodshole.er.usgs.gov/project-pages/DSAS/version4/index.html (scroll down below current version) and should be cited as:
    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.

    The DSAS 3.0 is available at http://woodshole.er.usgs.gov/project-pages/dsas/version3 and should be cited as:
    Thieler, E.R., Himmelstoss, E.A., Zichichi, J.L., and Miller, T.L., 2005, Digital Shoreline Analysis System (DSAS) version 3.0: An ArcGIS extension for calculating shoreline change: U.S. Geological Survey Open-File Report 2005-1304.

    The DSAS 2.0 is available at http://woodshole.er.usgs.gov/project-pages/DSAS/version2 and should be cited as:
    Thieler, E. R., Martin, D., and Ergul, A., 2003, The Digital Shoreline Analysis System, version 2.0: Shoreline change measurement software extension for ArcView: USGS U.S. Geological Survey Open-File Report 03-076.

    The original DSAS version 1.0 is documented here http://pubs.er.usgs.gov/pubs/ofr/ofr92355 and should be cited as:
    Danforth, W. W., and Thieler, E. R., 1992, Digital Shoreline Analysis System (DSAS) User's Guide, Version 1.0: U.S. Geological Survey Open-File Report 92-355, 42 p.

    Utilities

    Uninstall patch for DSAS version 4.x
    This patch is ONLY for users who uninstalled ArcGIS 9.x before uninstalling DSAS version 4.x. Please note, when upgrading to a new version of ArcGIS, it is best to first uninstall custom ArcGIS extensions (such as DSAS). DSAS was developed using standard Esri-recommended methodology, but unfortunately cannot be removed if ArcGIS has already been uninstalled from the system. If ArcGIS 9.x was uninstalled (typical during a version update to ArcGIS 10) before uninstalling DSAS, the Esri libraries DSAS requires to unregister itself are no longer available. For users who find themselves unable to uninstall DSAS, use this patch.
    Conversion utility

    Conversion utility
    DSAS transects created in the previous DSAS version 2x (for ArcView 3.x) can now be imported for use in DSAS version 4 using the stand-alone utility available for download at http://woodshole.er.usgs.gov/project-pages/dsas/Transect_converter/DSAS_convert_transects.zip

    History

    The DSAS software was originally developed in the early 1990’s and has undergone continuous, albeit episodic refinement. DSAS version 1.0 (1992) was written in the C and awk programming languages for use with the MapGrafix and ArcInfo Geographic Information Systems. DSAS version 2.0 was written in Avenue for ArcView 3.x. DSAS version 3.x (ArcGIS 9), DSAS version 4.2 (ArcGIS 9) and DSAS version 4.3.4730 (ArcGIS 10) were written in VB.NET using the ArcObjects Object Library for ArcGIS.

    Each version of DSAS includes many improvements that are described in the documentation. Typically, we concentrate our efforts on improving the rate-of-change statistics and the user interface.

    Related Publications

    Thieler, E.R., and Danforth, W.W., 1994. Historical shoreline mapping (I): improving techniques and reducing positioning errors: Journal of Coastal Research, v. 10, no. 3, p. 549-563.

    Thieler, E.R., and Danforth, W.W., 1994. Historical shoreline mapping (II): application of the Digital Shoreline Mapping and Analysis Systems (DSMS/DSAS) to shoreline change mapping in Puerto Rico: Journal of Coastal Research, v. 10, no. 3, p. 600-620.


    These pages are provisional and contain computer applications or scripts that may be changed without notice as new versions or revisions of the material are created. Although this program has been used by the USGS, no warranty, expressed or implied, is made by the USGS or the United States Government as to the accuracy and functioning of the program and related program material nor shall the fact of distribution constitute any such warranty, and no responsibility is assumed by the USGS in connection therewith.

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    This page last modified on Tuesday, 18-Jul-2017 09:52:39 EDT