As a starting point, ordered digital coastline node data can be extracted from the National Geophysical Data Center's webpage (https://www.ngdc.noaa.gov/mgg/shorelines/) at various scales ranging from 1:70,000 to 1:5,000,000. If the coastline is very highly resolved, causing an excessive number of elements along the shoreline, the routine "xy_simplify.m" can be used to reduce the number of nodes to the desired resolution. Remember to format this data into a .poly file, consisting of nodes and segments, before inputting into BATTRI. To refine an already created grid, the user can input the above referenced information either in the form of a previously created .poly file or in the form of NML standard .nod, .ele and .bat files (see next section, Running BATTRI).
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