JALBTCX/QRStep5

Step 5, Generate Shoreline. Red stars indicate required fields.

Summary: This tool generates shorelines from raster datasets at a user defined elevation. The shorelines generated in this step are necessary for shoreline change computation.

Raster Layers: Specify one or more raster layers from where the shoreline elevation will be extracted.

Raster Date (YYYYMMDD): Date associated with the raster from the above input.

Contour Elevation: Elevation of contour to represent shoreline position (typically the MHW value for area of interest)

Smooth Shoreline: The default value is NO. Should the user require smoothing the shoreline and select YES, the algorithm and tolerance must be specified.

Smooth Algorithm: Choose between Paek and Bezier interpolation for smoothing. Documentation on both algorithms can be found within ArcGIS Pro Tool Reference resources.

Smooth Tolerance: Specify the number of units (based on the horizontal units of the raster) that are considered when smoothing the line. A larger number corresponds to a more smoothed (more linear) line.

Number of Lines: This tool creates contours for all selected Raster Layers/ Number of lines sorts the contour lines by length and selects the longest X lines. A value of “2” would select the longest two lines.

Output Shoreline: Output line feature class that represents the computed shorelines. The shapefile name and save location are user defined.

Best Practices & Example Data: 1. The shorelines from this tool may require manual editing to delete contour lines that are not shoreline data. For smoothing tolerance, a value of 20 meters is typically effective and is the default value within the tool.

Figure 8 below displays output 2018 and 2019 shorelines for example Homer, AK data.

Figure 8: Shoreline outputs in purple (2019) and green (2018) at Homer, AK

[Previous Step] [Next Step]

Useful Links

JALBTCX Main Documentation Page

Refences: Quick Response Toolbox