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Ports of the United States

Metadata also available as [Parseable text] - [XML]

Frequently anticipated questions:


What does this data set describe?

Title: Ports of the United States
Abstract:
This map layer shows major ports in the United States, Puerto Rico, and the U.S. Virgin Islands. A port is a city, town, or urban area with a harbor where ships load or unload. This is a revised version of the July 2012 map layer.
Supplemental_Information:
Information about National Atlas Web services can be found on the Web Map and Web Feature Services page; see <http://nationalatlas.gov/infodocs/webservices.html>.
  1. How should this data set be cited?

    National Atlas of the United States, 201303, Ports of the United States: National Atlas of the United States, Rolla, MO.

    Online Links:

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -167
    East_Bounding_Coordinate: -64
    North_Bounding_Coordinate: 68
    South_Bounding_Coordinate: 17

  3. What does it look like?

  4. Does the data set describe conditions during a particular time period?

    Calendar_Date: Mar-2013
    Currentness_Reference: Publication date

  5. What is the general form of this data set?

    Geospatial_Data_Presentation_Form: Vector digital data

  6. How does the data set represent geographic features?

    1. How are geographic features stored in the data set?

      This is a Vector data set. It contains the following vector data types (SDTS terminology):

      • Entity point (192)

    2. What coordinate system is used to represent geographic features?

      Horizontal positions are specified in geographic coordinates, that is, latitude and longitude. Latitudes are given to the nearest 0.000278. Longitudes are given to the nearest 0.000278. Latitude and longitude values are specified in Decimal degrees.

      The horizontal datum used is North American Datum of 1983.
      The ellipsoid used is GRS1980.
      The semi-major axis of the ellipsoid used is 6378137.
      The flattening of the ellipsoid used is 1/298.257222.

  7. How does the data set describe geographic features?

    Port
    A city, town, or urban area with a harbor where ships load or unload. (Source: National Atlas of the United States)

    Shape
    The representation of the entity in the data. (Source: National Atlas of the United States)

    ValueDefinition
    Point0-dimensional element.

    Name
    The name of the port. (Source: National Atlas of the United States)

    There is no predefined set of valid port names.

    Waterway
    The waterway on which the port is located. (Source: National Atlas of the United States)

    There is no predefined set of waterways.

    State
    The 2-character FIPS code of the State or State equivalent in which the station is located. (Source: National Atlas of the United States)

    Formal codeset
    Codeset Name:Codes for the Identification of the States, the District of Columbia and the Outlying Areas of the United States, and Associated Areas; FIPS 5-2.
    Codeset Source:U.S. Department of Commerce, National Institute of Standards and Technology

    State_fips
    The 2-digit FIPS code of the State or State equivalent. (Source: National Atlas of the United States)

    Formal codeset
    Codeset Name:Codes for the Identification of the States, the District of Columbia and the Outlying Areas of the United States, and Associated Areas; FIPS 5-2.
    Codeset Source:U.S. Department of Commerce, National Institute of Standards and Technology.

    Gnis_id
    The Geographic Names Information System identification code for the port. (Source: National Atlas of the United States)

    ValueDefinition
    0The port is not included in GNIS.

    Formal codeset
    Codeset Name:Geographic Names Information System
    Codeset Source:U.S. Board on Geographic Names

    Gnis_name
    The port name as found in GNIS. (Source: National Atlas of the United States)

    ValueDefinition
    <blank>The port is not included in GNIS.

    Formal codeset
    Codeset Name:Geographic Names Information System
    Codeset Source:U.S. Board on Geographic Names

    Source
    The source of the port information. (Source: National Atlas of the United States)

    ValueDefinition
    GNIS_PORTSThe port location came from GNIS.
    GNISpointsByUrbanCenterGroupingThe port location was determined from an urban center location and the position of multiple ports in GNIS.
    InlandWaterPorts from NETSThe port location came from U.S. Army Corps of Engineers information.
    USACEThe port location came from the National Transportation Atlas Database.

    Secondary_
    The secondary waterway associated with the port. (Source: National Atlas of the United States)

    ValueDefinition
    <blank>There is no secondary waterway associated with the port.

    There is no predefined set of secondary waterways.

    Source_lat
    The latitude of the port, as provided in the source data. (Source: National Atlas of the United States)

    ValueDefinition
    0.0The port latitude was not provided in the source data.

    Range of values
    Minimum:17.706031
    Maximum:61.268056

    Source_long
    The longitude of the port, as provided in the source data. (Source: National Atlas of the United States)

    ValueDefinition
    0.0The port longitude was not provided in the source data.

    Range of values
    Minimum:-152.857500
    Maximum:-64.770670

    Lat
    The latitude of the port, as determined by the processing software. (Source: National Atlas of the United States)

    Range of values
    Minimum:17.7060309
    Maximum:66.899822274

    Long
    The longitude of the port, as determined by the processing software. (Source: National Atlas of the United States)

    Range of values
    Minimum:-166.532282693
    Maximum:-64.770669900


Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)

    • National Atlas of the United States

  2. Who also contributed to the data set?

  3. To whom should users address questions about the data?

    National Atlas of the United States
    U.S. Geological Survey
    Reston, VA 20192

    1-888-ASK-USGS (1-888-275-8747) (voice)
    atlasmail@usgs.gov

    Contact_Instructions:
    For questions about this map layer or metadata, please contact the National Atlas using the information above, or through the U.S. Geological Survey contact page at <http://www.usgs.gov/ask/>. For distribution questions, please see the Distribution Information elsewhere in this metadata.


Why was the data set created?

These data are intended for geographic display and analysis at the national level, and for large regional areas. The data should be displayed and analyzed at scales appropriate for 1:1,000,000-scale data. No responsibility is assumed by the National Atlas of the United States in the use of these data.


How was the data set created?

  1. From what previous works were the data drawn?

    NTAD (source 1 of 9)
    Research and Innovative Technology Administration, Bureau of Transportation Statistics (RITA/BTS), 2011, National Transportation Atlas Database 2011 - U.S. Army Corps of Engineers Ports: Research and Innovative Technology Administration, Bureau of Transportation Statistics (RITA/BTS), Washington, DC.

    Online Links:

    Type_of_Source_Media: Online
    Source_Contribution: Spatial and attribute information

    GNIS_PORTS (source 2 of 9)
    U.S. Geological Survey, 2010, Geographic Names Information System: U.S. Geological Survey, Reston, VA.

    Online Links:

    Type_of_Source_Media: Online
    Source_Contribution: Attribute information

    Cities (source 3 of 9)
    National Atlas of the United States, 201207, Cities and Towns of the United States: National Atlas of the United States, Rolla, MO.

    Online Links:

    Type_of_Source_Media: Online
    Source_Scale_Denominator: 1000000
    Source_Contribution: Spatial information

    DOQ (source 4 of 9)
    Microsoft Corporation and its data suppliers, 2011, Bing Maps Aerial: ESRI, Redlands, CA.

    Online Links:

    Type_of_Source_Media: Online
    Source_Contribution: Spatial information

    Topo (source 5 of 9)
    Society, National Geographic , 2009, USA Topo Maps: ESRI, Redlands, CA.

    Online Links:

    Type_of_Source_Media: Online
    Source_Contribution: Attribute information

    USACE (source 6 of 9)
    U.S. Army Corps of Engineers (USACE), 2005, An Overview of the U.S. Inland Waterway System: USACE, Washington, DC.

    Other_Citation_Details: IWR Report 05-NETS-R-12, p. 6, 7, and 30
    Type_of_Source_Media: Paper
    Source_Contribution: Spatial and attribute information

    QC (source 7 of 9)
    National Atlas of the United States, Unknown, 1:1,000,000-Scale National Atlas map layers and other quality control files.

    Other_Citation_Details:
    Numerous sources were used to perform quality-control and vertical integration, including all the 1:1,000,000-scale National Atlas map layers, a variety of online sources, and online USGS topographic maps. More information is available from the National Atlas contacts listed elsewhere in this metadata.
    Type_of_Source_Media: Variable
    Source_Contribution: Spatial information

    National Atlas 1M Ports 2012 (source 8 of 9)
    National Atlas of the United States, 201207, Ports of the United States: National Atlas of the United States, Rolla, MO.

    Online Links:

    Type_of_Source_Media: Online
    Source_Contribution: Spatial and attribute information

    ESRI ArcGIS Online Maps (source 9 of 9)
    Environmental Systems Research Institute - ESRI, Unknown, ArcGIS Online Map and Geoservices.

    Online Links:

    Type_of_Source_Media: Online
    Source_Contribution: Spatial and attribute information.

  2. How were the data generated, processed, and modified?

    Date: Aug-2010 (process 1 of 3)
    The ports were downloaded from the NTAD as a feature class. Additional ports were added from GNIS_PORTS by selecting all harbor features with "Port" in the name. The resulting GNIS feature selections were checked against DOQs and topographic maps to make sure they were actually port sites.
    To identify groups of port sites, each urban center that contained port sites was buffered by 10 miles, and GNIS ports within the 10-mile buffer were assigned to that urban center. The selected port sites were then buffered and merged by urban area, and a centroid was created for each merged port-site area. This resulted in 125 sites representative of both NTAD and GNIS harbor urban groupings.
    Groupings of NTAD sites were reviewed and assigned to urban centers, if they were not already assigned in the step above.
    The US Army Corps of Engineers report, including the Mississippi River System inland port map, was used to ensure that all major inland ports were represented. If an inland port was listed in this document, and was not in GNIS or the NTAD, a point was placed in the harbor using the nearest city location and an online DOQ.

    Data sources used in this process:

    • NTAD
    • GNIS_PORTS
    • DOQ
    • Topo
    • Cities
    • USACE

    Date: 2012 (process 2 of 3)
    All the 1:1,000,000-scale map layers were checked for vertical integration.

    Data sources used in this process:

    • QC

    Data sources produced in this process:

    • National Atlas 1M Ports 2012

    Date: 2013 (process 3 of 3)
    Port positions were adjusted to more accurately reflect actual port locations; locations were determined from reference to the ESRI ArcGIS Online Maps including Bing Maps Hybrid, Bing Maps Aerial, Bing Maps Road, National Geographic World Map, World Street Map, and the USA Topographic Maps. Several ports were deleted. The map layer was saved in shapefile and in file geodatabase formats.

  3. What similar or related data should the user be aware of?


How reliable are the data; what problems remain in the data set?

  1. How well have the observations been checked?

  2. How accurate are the geographic locations?

  3. How accurate are the heights or depths?

  4. Where are the gaps in the data? What is missing?

    The map layer includes major ports in the United States, Puerto Rico, and the U.S. Virgin Islands

  5. How consistent are the relationships among the observations, including topology?

    The map layer was checked for topological consistency using ArcGIS. No other checks for logical consistency were performed on this map layer. Port locations are approximate and may fall either on land or on water.


How can someone get a copy of the data set?

Are there legal restrictions on access or use of the data?

Access_Constraints: None
Use_Constraints:
None. Acknowledgment of The National Atlas of the United States of America would be appreciated in products derived from these data.

  1. Who distributes the data set? (Distributor 1 of 1)

    Earth Explorer, U.S. Geological Survey
    U.S. Geological Survey
    Sioux Falls, SD 57198-0001

    605-594-6116 (voice)
    custserv@usgs.gov

  2. What's the catalog number I need to order this data set?

  3. What legal disclaimers am I supposed to read?

    Although these data have been processed successfully on a computer system at the U.S. Geological Survey, no warranty expressed or implied is made by the U.S. Geological Survey regarding the utility of the data on any other system, nor shall the act of distribution constitute any such warranty. No responsibility is assumed by the U.S. Geological Survey in the use of these data.

  4. How can I download or order the data?


Who wrote the metadata?

Dates:
Last modified: 11-Mar-2013
Metadata author:
National Atlas of the United States
U.S. Geological Survey
Reston, VA 20192

1-888-ASK-USGS (1-888-275-8747) (voice)
atlasmail@usgs.gov

Metadata standard:
FGDC Content Standards for Digital Geospatial Metadata (FGDC-STD-001-1998)



 


Generated by mp version 2.9.14 on Mon Mar 11 16:06:42 2013