GIS Lookup: Detailed Data Layer Listing

Title: "NTAD: National Waterway Network (line)" (2004)
 
Description: The National Waterway Network is a comprehensive network database of the nation's navigable waterways. The data set covers the 48 contiguous states plus the District of Columbia, Hawaii, Alaska, Puerto Rico and water links between. The nominal scale of the dataset varies with the source material. The majority of the information is at 1:100,000 with larger scales used in harbor/bay/port areas and smaller scales used in open waters. The National Waterway Network is a geographic database of navigable waterways in and around the United States, for analytical studies of waterway performance, for compiling commodity flow statistics, and for mapping purposes.
 
Keywords and Themes: Transportation, Waterways
 
Filename Prefix: waterway
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Download Instructions: In the ftp window that opens, search for and save locally all files with the above Filename Prefix.  
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Mapped Drive Folder: /fedgov/bts/ntad04/polyline/waterway/
Total size of data files: 2.94 MB
 
Data Type: ESRI Shapefile
Feature Type: Polyline
Coordinate System: GCS_WGS_1984
Datum: D_WGS_1984Map Units: Decimal degrees

Spatial Extent: United States, Puerto Rico, Gulf of Mexico, Great Lakes, Intracoastal waterway
Source Scale: The "shape source" field in the link database, and the "node source" field in the node database indicate the data sources used to derive link and node placements. The accuracy of each network element is correlated to the data source used to derive that element. For example, links and nodes derived from 1:100,000 scale DLGs are more accurate than links and nodes derived from 1:500,000 scale NOAA Navigational Charts. Links with unknown/missing sources are usually schematic representations of USACE links. Off-Shore: NOAA Charts vary in scale. Larger scale charts were used in harbor/port areas, while smaller scale charts were used in open water. For channels, sea lanes, and Intracoastal Waterways, shape points were placed as needed to ensure that link segments fall within waterway boundaries. Inland: Links digitized from 1:100,000 DLG files, or large scale NOAA charts are the most accurate representations. Shape points were placed as needed to ensure that link segments fall between waterway shorelines. Links derived from Corps milepoints have shape points approximately one mile apart. The Corps milepoints were mainly derived from 1:24,000 and 1:100,000 scale maps. Therefore, the shape points derived from Corps milepoints are often as accurate as shape points derived from 1:100,000 DLG files. However, line segments connecting the shape points may not accurately represent the curvature of the waterway.

Created by: U.S. Army Corps of Engineers Navigation Data Center
Released by: Bureau of Transportation Statistics (BTS)
Content Date: 2004
Published Date: 20040518

Collection Name: National Transportation Atlas Databases (NTAD) 2004
Physical Location: Reference Gov. Docs. CD Cabinet
Call Number:
Acquired Date: 20040901
Distribution Restrictions: Public Domain

Note: Acknowledgment of Bureau of Transportation Statistics (BTS) National Transportation Atlas Databases (NTAD) 2004 would be appreciated in products derived from these data.

Links to Metadata, Documentation, and Mapping:

Record ID: 2500_ntad04