Keywords
Theme:
hydrography, water, polygon, line
Place:
United States of America, United States, USA, US
Stratum:
ground
Temporal:
2000, 2007, 2008, 2009
Description
Abstract
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.
Purpose
The RITA/BTS desires a single nationwide database that has polygons/attributes for major rivers and lakes, is consistent across state lines, and has the most accurate data available. This database will be used primarily for map production, basic queries, and will be distributed as part of the National Transportation Atlas Database (NTAD) 2009.
Supplementary Information
The RITA/BTS HYDRO Database contains TIGER 2000 geometry and attributes. UTCTR flagged this database to represent major water features and edited the geometry to insure polygons would fill for cartographic representation.
To find out more about TIGER/Line files and other Census TIGER data base derived data sets visit http://www.census.gov/geo/www/tiger.
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Status of the data
Complete
Data update frequency:
None planned
Time period for which the data is relevant
Date and time:
2009
Description:
ground condition
Publication Information
Who created the data: U.S. Bureau of the Census (BOC), Research and Innovative Technology Administration's Bureau of Transportation Statistics (RITA/BTS)
Date and time:
2000
Publisher and place:
U.S. Bureau of the Census (BOC), Suitland, MD
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Data storage and access information
File name: hydropol
Type of data: vector digital data
Location of the data:
http://www.census.gov
http://www.bts.gov/programs/geographic_information_services/
Data processing environment: Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 2; ESRI ArcCatalog 9.2.6.1500
Accessing the data
Data format: ESRI Shapefile
Size of the data: 156.825 MB
Data transfer size: 161.164 MB
How to decompress the file: No compression applied. However, if using digital transfer online option, note access instructions.
Access instructions: The NTAD DVD can be ordered from the online bookstore at www.bts.gov. NTAD can also be downloaded from the Geographic Information Program web sit at http://www.bts.gov/programs/geographic_information_services/.
Available media: DVD
Constraints on accessing and using the data
Access constraints:
None
Use constraints:
Acknowledgement of the Research and Innovative Technology Administration's Bureau of Transportation Statistics (RITA/BTS) National Transportation Atlas Databases (NTAD) 2009 would be appreciated in products derived from these data.
Details about this document
Contents last updated: 20090403
at time 12284200
Who completed this document
Geospatial Information Program
Research and Innovative Technology Administration's Bureau of Transportation Statistics (RITA/BTS)
mailing and physical address:
202-366-DATA (voice)
answers@bts.gov
Standards used to create this document
Standard name: FGDC Content Standards for Digital Geospatial Metadata
Standard version: FGDC-STD-001-1998
Time convention used in this document: local time
Metadata profiles defining additonal information
ESRI Metadata Profile: http://www.esri.com/metadata/esriprof80.html
Horizontal coordinate system
Geographic coordinate system name: GCS_WGS_1984
Details
Geographic Coordinate System
Latitude Resolution: 0.000001
Longitude Resolution: 0.000001
Geographic Coordinate Units: Decimal degrees
Geodetic Model
Horizontal Datum Name: D_WGS_1984
Ellipsoid Name: WGS_1984
Semi-major Axis: 6378137.000000
Denominator of Flattening Ratio: 298.257224
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Bounding coordinates
Horizontal
In decimal degrees
West:
-179.252851
East:
179.830623
North:
71.441056
South:
17.831509
In projected or local coordinates
Left: -179.252851
Right: 179.830623
Top: 71.441056
Bottom: 17.831509
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Lineage
FGDC lineage
Process step 1
Process description: 1) Downloaded zipped shapefiles from www.geographynetwork.com; 2) Converted the Shapefiles to Coverages; 3) Removed all intermittent water features H02, H12, H22, H32, H42, H60, H71, H72, H80, and H81 from the database coverages; 4) Flagged arcs to be retained in the output coverage based on relative importance and research using the Internet and state maps; 5) Added attributes to polygons to denote name description and land/water. These attributes were then populated by user input using mapping resources such as state and county maps; 6) Added attribute to both arcs and polygons to denote navigable waterways. For single line features, the arcs were flagged. If a feature contained polygons, the polygons only were flagged; 7) States were then appended, extra items dropped, data released.
Source used: TIGER
Process date: 200006
Process step 2
Process description: When UTN processed the TIGER dataset for State, County and Hydrographic (lines and polygons), a 3-mile buffer was created around the Texas shorelines. This buffer removed the island off the coast of Texas. To correct this error, BTS used ARC/INFO to remove the 3-mile buffer to capture the islands along Texas. To capture the islands, the state dataset needed to be reselected by selecting: code = 1. This process created a few inaccurate polygons and they were removed. To create the final datasets, the datasets were dissolved and regions created on STFIPS and County FIPS.
Process date: 200303
Sources
Source 1:
Nationwide Hydrographic Database
(HYDRO)
Media: digital tape media
Scale denominator: 100,000
Contribution: Unknown
Currentness of this source
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Spatial data quality
Horizontal positional accuracy
Consistent with TIGER 2000
Estimated accuracy: 1:
How this value was determined:
1: = Unknown
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Spatial data description
Vector data information
ESRI description
hydropol
ESRI feature type: Simple
Geometry type: Polygon
Topology: FALSE
Feature count: 57364
Spatial Index: TRUE
Linear referencing: FALSE
SDTS description
Feature class: SDTS feature type, feature count
hydropol:
G-polygon, 57364
Feature class:
Label point, 54513
Feature class:
GT-polygon composed of chains, 54513
Feature class:
Node, planar graph, 483121
Feature class:
Point, 4