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  • Added 18 Sep 2016

The hydro polygon/arc coverages were created using TIGER/LINE 2000 shapefile data gathered from ESRI's Geography Network. The individual county hydrography line shapefiles were processed into Arc/Info coverages and then appended together to create complete state coverages. They were then edited to remove unwanted features, leaving a state-by-state database of both important and navigable water features. Attributes were added to denote navigable features and names. Also, an attribute was added to the polygons to denote which were water and which were land features. The state databases were then appended together to create a single, nationwide hydrography network containing named arcs and polygons. These features also contain a state FIPS. Because some of the hydro features are represented by lines instead of polygons, the complete hydro dataset consists of 2 shapefiles, one for lines and one for polygons. They must be used together to paint a complete picture.

© U.S. Census and ESRI
This layer is sourced from maps.bts.dot.gov.

The hydrographic linear coverages (NTAD 2015) were created using TIGER/LINE 2000 shapefile data gathered from ESRI's Geography Network. The individual county hydrography line shapefiles were processed into Arc/Info coverages and then appended together to create complete state coverages. They were then edited to remove unwanted features, leaving a state-by-state database of both important and navigable water features. Attributes were added to denote navigable features and names. Also, an attribute was added to the polygons to denote which were water and which were land features. The state databases were then appended together to create a single, nationwide hydrography network containing named arcs and polygons. These features also contain a state FIPS. Because some of the hydro features are represented by lines instead of polygons, the complete hydro dataset consists of 2 shapefiles, one for lines and one for polygons. They must be used together to paint a complete picture.

© U.S. Census and ESRI

Information

Copyright Copyright may apply. Please check the source for more information.
RegionsNorth America

Technical Details

Layer ID 22708
Data type Vector linestring
Feature count 522340
Attributes State_FIPS_Code, Shape_Length, FENAME, NAVIGABLE, State_Postal_Code
Services Vector Query API

History

SourceNone
Added 18 Sep 2016 ago
Last checked 5 Sep 2018 ago
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