NOAA Composite Shoreline - Vectorized Shoreline Derived From NOAA-NOS Coastal Survey Maps and Aerial Photographs

The NOAA Composite Shoreline is primarily intended for high-resolution cartographic representation of the shoreline. It is a high-resolution vector shoreline based on a multi-temporal collection of NOAA coastal survey maps (T-sheets). Where T-sheets were unavailable, NOAA's extracted vector shoreline (EVS) was used to compile seamless shoreline coverage.

This shoreline can be used as a base layer to represent the shoreline in GIS systems and maps.

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The NOAA NESDIS Environmental Data Rescue Program (EDRP) and Climate Database Modernization Program (CDMP) funded this project. The data were created by the National Ocean Service, National Geodetic Survey (previously the National Ocean Survey) as part of its ongoing mission to map the coastline of the United States. The NOAA National Ocean Service, Office for Coastal Management, developed the procedures used in this project and was responsible for project oversight. The project intent was to rescue valuable historical data and make it accessible and useful to the coastal mapping community. This process involved the conversion of original analog products to digital mapping products.

The data on this web site were generated by NOAA during the course of developing a special project to rescue and transform historical map data to a digital media. Although NOAA is making these data available to others who may find the data of value, NOAA does not warrant, endorse, or recommend the use of these data for any given purpose. The user assumes the entire risk related to the use of these data. These data are not for navigational purposes. These data are provided "as is," and NOAA disclaims any and all warranties, whether expressed or implied, including (without limitation) any implied warranties of merchantability or fitness for a particular purpose. In no event will NOAA be liable to you or to any third party for any direct, indirect, incidental, consequential, special, or exemplary damages or lost profits resulting from any use or misuse of these data.

To download the shoreline in its entirety, see the Shoreline Data download page (http://shoreline.noaa.gov/data/datasheets/composite.html).;

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These data were generated for use by NOAA during the course of its development of potential final products to fulfill its statutory mission. Although NOAA is making these data available to others who may find the data of value, NOAA does not warrant, endorse, or recommend the use of these data for any given purpose. The user assumes the entire risk related to the use of these data. These data are not for navigational purposes. NOAA is providing these data "as is," and NOAA disclaims any and all warranties, whether expressed or implied, including (without limitation) any implied warranties of merchantability or fitness for a particular purpose. In no event will NOAA be liable to you or to any third party for any direct, indirect, incidental, consequential, special, or exemplary damages or lost profits resulting from any use or misuse of these data.

The attribute accuracy was tested by creating checkplots of the coded linework. The different codes depict shoreline, piers, dikes, jetties, breakwaters, and groins. A light table review of the checkplots would reveal any inaccurate coding. Mistakes would be identified and corrected until accurate checkplots were produced. The feature codes (f-codes) are identified as follows: approximate shoreline (1), apparent shoreline (3), shoreline plane of reference (SPOR) (7), dike or levee (25), jetty, breakwater, or groin (27), shoreline along feature boundaries (28), pier, ramp, or dock (30), general class for man-made objects that form a shore or waterline to include - wells or oil platforms, wrecks, locks, dry docks, revetments, seawalls, wharves, marine railroads, or shorelines of seaplane bases or anchorages (38), control point or shoreline map correction line (139), map extent line (-1000), user added arc (-9999), state boundary (-9997), state water (-9996).

The horizontal positional accuracy for the digital data was tested by producing checkplots of the vectorized data and overlaying it with a plot of the rasterized T-Sheet on a light table. Linework which appeared to be greater than a pen width off of the T-Sheet was considered in error, and revisions were made until new checkplots revealed an accurate depiction of the T-Sheet.

These shoreline data adequately represented the shoreline at the time of the survey.

Linework was vectorized to the neatline of the shoreline map. All data crossing the neatline was clipped to the neatline. All arcs were snapped by the nodes to create consistently tied strings without node dangles.