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Delaware River, NJ and PA shoreline data were automated to provide a high-resolution historical GIS layer. The data are derived from shoreline maps produced by the NOAA National Ocean Service and its predecessors, based on imagery interpretation and field surveys. Attribution follows the NGS-developed C-COAST scheme, influenced by the International Hydrographic Organization's S-57 standard.
File formats are PDF and HTML; the actual GIS data layer format is not specified.