National Geodetic Survey's Vector Shoreline

IDENTIFICATION INFORMATION
DATA QUALITY INFORMATION
SPATIAL DATA ORGANIZATION INFORMATION
SPATIAL REFERENCE INFORMATION
ENTITY AND ATTRIBUTE INFORMATION
DISTRIBUTION INFORMATION
METADATA REFERENCE INFORMATION

These shoreline data represent a vector conversion of a set of NOS raster shoreline manuscript identified by t-sheet or tp-sheet numbers. These vector data were created by contractors for NOS who vectorized georeferenced raster shoreline manuscripts using Environmental Systems Research Institute, Inc. (ESRI)(r), ArcInfo's(r) ArcScan(r) software to create individual ArcInfo coverages. The individual coverages were ultimately edgematched within a surveyed project area and appended together. The NOAA NESDIS Environmental Data Rescue Program (EDRP) funded this project. The NOAA National Ocean Service, Coastal Services Center, 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. This file is a further conversion of that product from a raster to a vector product that may be useful for Electronic Charting and Display Information Systems (ECDIS) and geographic information systems (GIS).

In 1807, Thomas Jefferson created an organization named the Survey of the Coast "...to cause a survey to be taken of coasts of the United States, in which shall be designated the islands and shoals and places of anchorage..." The data were created by the National Ocean Service, National Geodetic Survey as part of its ongoing mission to provide base maps of the coastline. The data are made available through a web-based delivery system. The NOAA ESDIM Environmental Services Data and Information Management (ESDIM) data rescue program contributed in funding this project. The NOAA, National Ocean Service, Coastal Services Center, 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 as a state composite. This process involved the conversion of original analog products to digital mapping products. This file is a further conversion of that product from a raster to a vector product that may be useful for Electronic Charting and Display Information Systems (ECDIS) and geographic information systems (GIS).

These data were automated to provide an accurate high-resolution historical shoreline of Northern Chesapeake Bay, Maryland suitable as a geographic information system (GIS) data layer. These data are derived from shoreline maps that were produced by the NOAA National Ocean Service including its predecessor agencies which were based on an office interpretation of imagery and/or field survey. The NGS attribution scheme 'Coastal Cartographic Object Attribute Source Table (C-COAST)' was developed to conform the attribution of various sources of shoreline data into one attribution catalog. C-COAST is not a recognized standard, but was influenced by the International Hydrographic Organization's S-57 Object-Attribute standard so the data would be more accurately translated into S-57.

The shoreline and associated data layers were originally intended to support NOAA Nautical Chart production. These datasets have been cleaned and reformatted to support the efforts of supplying accurate shoreline data layers for a coastal GIS database. These datasets may be beneficial for performing change analysis for erosion and accretion studies, land use planning, determination of boundary extent, and other types of decision making.

Metadata may be viewed and saved after a shoreline project is selected or is automatically created during the download option. Metadata includes only those features selected to be displayed on the map within the Navigator View. It is the user's responsibility to save the metadata from the displayed pop-up window.
Preview HTTP://www.ngs.noaa.gov/RSD/shoredata/NGS_Shoreline_Products.htm
Moreinfo HTTP://www.ngs.noaa.gov/RSD/shoredata/NGS_Shoreline_Products.htm

Theme_Keyword: Shoreline map
Theme_Keyword: Coastal base map
Theme_Keyword: State Composite
Theme_Keyword: Composite
Theme_Keyword: Coastal zone map
Theme_Keyword: Shoreline
Theme_Keyword: Vectorization
Theme_Keyword: Shoreline vectorization
Theme_Keyword: Shoreline data
Theme_Keyword: T-sheet
Theme_Keyword: Tp-sheet
Theme_Keyword: CM-7601
Theme_Keyword: Coast and Geodetic Survey
Theme_Keyword: Tide-controlled Photography
Theme_Keyword: TP00956
Theme_Keyword: TP00957
Theme_Keyword: TP00958
Theme_Keyword: TP00959
Theme_Keyword: TP00960
Theme_Keyword: TP00961
Theme_Keyword: TP00962
Theme_Keyword: TP00963
Theme_Keyword: TP00964
Theme_Keyword: TP00965

These data were generated for use by NGS during the course of its development of potential final products to fulfill its statutory mission. Although NGS is making these data available to others who may find the data of value, NGS 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. NGS is providing these data "as is," and NGS 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 NGS 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.

U.S. Department of Commerce, National Oceanic and Atmospheric Administration, National Ocean Service, National Geodetic Survey, Remote Sensing Division

Sun Microsystems(r) workstation using Environmental Systems Research Institute, Inc. (ESRI)(r) ArcInfo(r) version 7.2.1

The shoreline and associated data are a representation based on an office interpretation of imagery and/or fieldwork at the time of survey. The attribute accuracy was tested by creating checkplots of the coded linework. The codes depict shoreline and several alongshore features. A light table review of the checkplots revealed any inaccurate coding. Mistakes were identified and corrected. These attributes were translated into NGS's Coastal Cartographic Object Attribute Source Table (C-COAST) for data consistency. The C-COAST attributes were given symbology and visually inspected to verify attribute accuracy.

All data are clipped to the neatline representing a surveyed project boundary. Line segments which did not close were snapped by the nodes to create consistently tied strings without node dangles.

The shoreline and associated data are a representation based on an office interpretation of photographs taken 19760101 to 19760301. To maintain shoreline continuity, a line with 'Shoreline/Alongshore Feature Boundary' attribution was added to the 'Shoreline' class. This feature is an artificial line that separates double-lined alongshore features from the shoreline. The 'Shoreline/Alongshore Feature Boundary' indicates to the user that a man-made alongshore feature is coincident to the shoreline in the data file. The rectangular geographic boundary limits is for data management purposes and does not infer complete surveyed coverage.

Vector data was derived from rectified raster images of NOS coastal survey maps using ArcInfo processing software. These vector shoreline data are referenced to the North American Datum of 1983. Vector shoreline extracted from map images adequately represents the shoreline shown on original NOS source surveys. The absolute value of the overall predicted horizontal accuracy has not been determined. However, the reports associated with the project maps describe the process of producing the map source and includes the horizontal control layout and if aerotriangulated, the fit to control statistics. One may refer to the 6 March 1991 edition of 'Journal of Coastal Research' entitled 'Historical Shoreline Change: Error Analysis and Mapping Accuracy' for an independent accuracy assessment of vectorized NOS digital shoreline conducted by the Federal Emergency Management Agency and the University of Maryland.

U.S. Department of Commerce, National Oceanic and Atmospheric Administration, National Ocean Service, National Geodetic Survey

TP00956
TP00957
TP00958
TP00959
TP00960
TP00961
TP00962
TP00963
TP00964
TP00965

TP00956
TP00957
TP00958
TP00959
TP00960
TP00961
TP00962
TP00963
TP00964
TP00965

Compilation derived from interpreted imagery.

During the vectorization process, all adjoining shoreline maps in the project are displayed on a computer screen and the shoreline is traced and coded appropriately. Maps within a project generally adjoin and, therefore, there is significant agreement of linework across the borders of the shoreline maps. This results in fewer errors related to the edge-matching process. Polygon labels and attributes are assigned to features containing area so that users may shade the data to determine land, water, or man-made features. All lines were attributed with feature code values which were translated to conform with NGS's Coastal Cartographic Object Attribute Source Table attribution scheme.

U.S. Department of Commerce, National Oceanic and Atmospheric Administration, National Ocean Service, National Geodetic Survey, Remote Sensing Division

Information relating to the field survey and compiled activities are described in the project's Descriptive Reports. Users interested in the method used during the vectorization process can refer to the training manual developed by the NOAA Coastal Services Center. This manual is available on their shoreline data web site for free download and is saved in Adobe .pdf format.

http://www.csc.noaa.gov/products/shorelines

Vector NGS Shoreline data

Not intended for navigational purposes

Web access at http://www.ngs.noaa.gov/newsys_ims/shoreline/index.cfm/