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Hello and welcome to the USGS series of help videos for the Digital Shoreline Analysis

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System, or DSAS.

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Today we present "Introduction to DSAS v5.0: Sample Data Workflow."

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This workflow assumes that you have already installed DSAS v5.0 with an ArcMap version of

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of 10.4 or higher, and have downloaded the USGS provided sample data.

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If not, please use the links listed below this video to navigate to the DSAS project page,

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where instructions on installing DSAS and downloading sample data can be found.

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Before getting started with DSAS, please make a note of the available help resources.

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In each DSAS window, there are gray "help" question marks. Simply click the question mark

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to read more about each element. For additional questions navigate to

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"DSAS Help", where you will find links to the DSAS Project Page and the full DSAS v5.0 User Guide.

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To begin, open ArcMap and click the “add data” button.

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Navigate to the folder where the DSAS sample data have been saved.

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Select both the shoreline and
baseline data and add them to the map.

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If you like, double click on each file in the table of contents to adjust the color properties.

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Next we will add a basemap file by clicking the drop-down arrow next to the “add data”

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button. Choose “add basemap” and select Imagery. Now we can orient the shoreline and

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baseline data in reference to land.

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Next locate the DSAS toolbar - and click the “Default Parameters” button.

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Select the baseline by clicking the drop-down arrow in “Baseline Layer” then choose

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the basic baseline. Select the "Baseline ID Field" - ID

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Leave the "Baseline Group Field" and the "Baseline Search Distance Field" blank.

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To determine the loation of land relative to baseline orientation check the box next to

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"Show Baseline Orientation.” This will change the symbology of the baseline layer to indicate

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the direction of flow of the baseline. This will help you make sure that all baseline segments

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are flowing in the same direction and allow you to determine the location of land relative to

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baseline orientation. The land is oriented to the right of the baseline in this case.

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For baseline placement, choose the “Midshore (or combination)” option, as the baseline

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segments are located both onshore and offshore.

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Next, click on the "Shoreline Settings"
tab.

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Choose the shorelines by clicking the drop-down arrow in “Shoreline Layer’ and select

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the basic shorelines. Next, select the "Date Field" -  “DSAS_date” and choose

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“DSAS_Uncy” for the "Shoreline Uncertainty Field".  Keep the default uncertainty set to 10

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meters. For "Intersection Parameters", select “Seaward Intersection”

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Next click on the "Metadata Settings" tab.

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For this section, populate the fields with general information to assist in automatic

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metadata production. Each element is required so be sure to fill in all the blanks!

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This may take a few minutes, but only needs to be done once.

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When you have finished - click OK to save all default parameter settings.

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Next, locate the DSAS toolbar and click the “Cast Transects” button.

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By default DSAS will save the transects and all subsequent rate information to the same

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geodatabase as the baselines and shorelines. Provide a name for the  new transects.

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Set the value for Maximum search distance to 1000, this will be the distance that

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DSAS searches on either side of the baseline for transects.

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Next set the transect spacing to 100 meters and set the smoothing distance to

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1000 meters. Keep the default setting to clip transects to shoreline extent and click

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OK to cast transects.

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A DSAS Alert will appear to inform you that the new transect layer has been selected

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in the DSAS toolbar, which is required for editing and calculating shoreline change rates.

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If you like, double click on the transect file to change its color properties.

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Review the transect coverage to ensure all shorelines are intersected and the

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orientation of the transects is roughly perpendicular to the general shoreline trend.

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From the DSAS toolbar click the “Calculate Rates” button.

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Select the statistics to run. You can choose “all” by clicking the checkbox at the top,

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or select individual statistics. For "Additional Parameters" - keep the default settings for

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"Intersection Threshold" and "Confidence Interval". For "Outputs" - choose to display the

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results using a color ramp by clicking the drop-down arrow and selecting the "LRR" statistic.

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Choose “Create DSAS Summary Report” which will summarize all of the basic statistics

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in a text file which is saved to the folder that contains the shoreline and baseline

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geodatabase. Click calculate to start. This may take a few minutes.

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Once DSAS has finished running, close the dialog box and review the newly created

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transect and intersect shapefiles.

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New to DSAS v5.0, rate information is stored with the transect file. If selected in the

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rate calculation settings, rates are returned with a predefined color ramp based on the

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selected statistic. In addition, all shoreline intersection  information is now stored in a

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new point shapefile.

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Once you have run rates, you can easily change the way the rate transects appear in

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the map. From the DSAS toolbar, click the “Data Visualization” button.

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Choose a rate layer within the map and select the desired statistic to display.

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Options for displaying rates include  “Apply color ramp” (a standardized color ramp

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Options for displaying rates include  “Apply color ramp” - a standardized color ramp

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designed by the USGS - or “scale to my data” - where output is adjusted to the full range

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of rate values within the dataset.

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This concludes the demonstration of the USGS provided basic sample data set for

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DSAS v5.0.

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You can view other DSAS help videos at the DSAS Project page listed below this video.