Pipelines in Louisiana, Geographic NAD83, USGS (1999) [pipelines_la_usgs_1999]

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Frequently-anticipated questions:


What does this data set describe?

Title:
Pipelines in Louisiana, Geographic NAD83, USGS (1999) [pipelines_la_usgs_1999]
Abstract:
This dataset contains vector line map information of various pipelines throughout the State of Louisiana. The vector data contain selected base categories of geographic features, and characteristics of these features, in digital form. The information was derived from existing USGS Digital Line Graphs.
  1. How should this data set be cited?

    United States Geological Survey, Biological Resources Division's, National , 19990101, Pipelines in Louisiana, Geographic NAD83, USGS (1999) [pipelines_la_usgs_1999].

    Online Links:

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -95.042014
    East_Bounding_Coordinate: -87.838221
    North_Bounding_Coordinate: 33.534448
    South_Bounding_Coordinate: 28.845392

  3. What does it look like?

    <URL:pipelines_la_usgs_1999.gif> (GIF)

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

    Calendar_Date: 01-Jan-1998
    Currentness_Reference: Publication Date of Source data

  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?

      Indirect_Spatial_Reference: The State of Louisiana
      This is a Vector data set. It contains the following vector data types (SDTS terminology):
      • String (8150)

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

      Grid_Coordinate_System_Name: Universal Transverse Mercator
      Universal_Transverse_Mercator:
      UTM_Zone_Number: 15
      Transverse_Mercator:
      Scale_Factor_at_Central_Meridian: 0.999600
      Longitude_of_Central_Meridian: -93.000000
      Latitude_of_Projection_Origin: 0.000000
      False_Easting: 500000.000000
      False_Northing: 0.000000

      Planar coordinates are encoded using coordinate pair
      Abscissae (x-coordinates) are specified to the nearest 0.000000
      Ordinates (y-coordinates) are specified to the nearest 0.000000
      Planar coordinates are specified in meters

      The horizontal datum used is North American Datum of 1927.
      The ellipsoid used is Clarke 1866.
      The semi-major axis of the ellipsoid used is 6378206.400000.
      The flattening of the ellipsoid used is 1/294.978698.

  7. How does the data set describe geographic features?

    pipelines_la_usgs_1999

    CODE

    Shape
    Feature geometry. (Source: ESRI)

    Coordinates defining the features.

    FNODE_

    TNODE_

    LPOLY_

    RPOLY_

    LENGTH

    LAPIPE_

    LAPIPE_ID

    MAJOR1

    MINOR1

    MAJOR2

    MINOR2

    MAJOR3

    MINOR3

    MAJOR4

    MINOR4

    MAJOR5

    MINOR5

    FID
    Internal feature number. (Source: ESRI)

    Sequential unique whole numbers that are automatically generated.

    Shape_Leng

    Entity_and_Attribute_Overview:
    The dataset consists of vectorized data of pipelines throughout the State of Louisiana. The lines have been assigned an attribute consisting of a code name. The code names can be found in the Attribute_Accuracy_Explanation section.
    Entity_and_Attribute_Detail_Citation:
    U.S. Department of the Interior, U.S. Geological Survey, 1987 Digital Line Graphs from 1:100,000-scale Maps, Reston, Virginia.


Who produced the data set?

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

  2. Who also contributed to the data set?

    The U.S. Geological Survey, National Wetlands Research Center acknowledges the use of USGS Digital Line Graphics (DLG's), 1:100,000 tiles covering the state of Louisiana. The pipeline data was derived from the DLG datasets.

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

    U.S. Geological Survey, National Wetlands Research Center
    c/o Steve Hartley
    Senior Geographer/GIS Analyst
    700 Cajundome Blvd.
    Lafayette, Louisiana 70506
    USA

    337-266-8543 (voice)
    337-266-8616 (FAX)
    steve_hartley@usgs.gov


Why was the data set created?

To extract a coverage of pipelines within the State of Louisiana to the State boundaries.


How was the data set created?

  1. From what previous works were the data drawn?

    DLGs (source 1 of 1)
    United States Geological Survey, 19850101, DLG's: USGS Digital Line Graphics, 1:100,000 scale Louisiana Catalog of Topographic and Other Published Maps, U.S. Geological Survey, Rolla, Missouri.

    Type_of_Source_Media: digital data
    Source_Scale_Denominator: 100000
    Source_Contribution: Spatial and Attribute information for Louisiana Pipelines.

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

    Date: 01-Jan-1999 (process 1 of 2)
    The pipeline data was extracted from existing USGS digital line graphs. Digital line graphs depict information about geographic features on or near the surface of the Earth, terrain, and political and administrative units. The digital line graphs were digitized from the USGS source quadrangle by the US Mapping Division or one of their contractors. All DLG data distributed by the USGS are DLG Level 3, which means the data contain a full range of attribute codes, have full topological structuring, and have passed certain quality-control checks. The final data is in the form of an ARC/INFO coverage.

    (process 2 of 2)
    Dataset copied.

    Data sources used in this process:

    • data\infrastructure.mdb

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

    The National Gap Program, 19990101, Louisiana Gap Project: National Gap Program Louisiana Gap Project, U.S. Department of the Interior, United States Geological Survey, The National Wetlands Research Center, Lafayette, Louisiana.

    U.S. Geological Survey, Varies, U.S. 1:100,000 Digital Line Graphs: U.S. Geological Survey, Rolla, MO.

    Online Links:


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

  1. How well have the observations been checked?

    The accuracy is not based on a formal quantitative assessment. Field checking was not performed for this assignment. To attain a better estimate of accuracy, a formal re-evaluation of the location and length of pipelines in Louisiana would be necessary.

  2. How accurate are the geographic locations?

    The accuracy of this data meets the accuracy of the National Map Accuracy Standards.

  3. How accurate are the heights or depths?

    The accuracy of the dataset meets the National Map Accuracy Standards, which is met by every 1:100,000K DLG utilized in this project. National Map Accuracy Standards' vertical accuracy requires that at least 90% of well defined points tested be within one half contour interval of the correct value.

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

    Processing of digital data follows conventions and standard methodologies for the time period and within limitations of available workstation equipment at the date of data development.

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

    The vector data (arcs) have been cleaned in an editing environment. Each line has one and only one attribute.


How can someone get a copy of the data set?

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

Access_Constraints:
It is strongly recommended that this data is directly acquired from the distributor described above or from another USGS Biological Resources Division server and not indirectly through other sources which may have changed the data in some way. The distributor makes no claims as to the data's suitability for other purposes.
Use_Constraints:
Acknowledgement of the U.S. Geological Survey, National Wetlands Research Center as a data source would be appreciated in products developed from these data, and such acknowledgment as is standard for citation and legal practices for data source is expected by users of this data. Sharing new data layers developed directly from these data would also be appreciated by U.S. Geological Survey, National Wetlands Research Center staff. Users should be aware that comparison with other data sets for the same area from other time periods may be inaccurate due to inconsistencies resulting from changes in mapping conventions, data collection, and computer processes over time. The distributor shall not be liable for improper or incorrect use of this data, based on the description of appropriate/inappropriate uses described in this metadata document. These data are not legal documents and are not to be used as such.

  1. Who distributes the data set? (Distributor 1 of 2)

    U.S. Geological Survey, National Wetlands Research Center
    c/o Steve Hartley
    Senior Geographer/GIS Analyst
    700 Cajundome Blvd
    Lafayette, Louisiana 70506
    USA

    337-266-8543 (voice)
    337-266-8616 (FAX)
    steve_hartley@usgs.gov

    Hours_of_Service: 8:00 am to 4:00 pm CST Monday thru Friday
  2. What's the catalog number I need to order this data set?

    Pipelines of the State of Louisiana

  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, National Wetlands Research Center, no warranty expressed or implied is made regarding the accuracy or utility of the data on any other system or for general or scientific purposes, nor shall the act of distribution constitute any such warranty. This disclaimer applies both to individual use of the data and aggregate use with other data. It is strongly recommended that these data are directly acquired from a Biological Resources Division server, and not indirectly through other sources which may have changed the data in some way. It is also strongly recommended that careful attention be paid to the contents of the metadata file associated with these data. U.S. Geological Survey, National Wetlands Research Center shall not be held liable for improper or incorrect use of the data described and/or contained herein. So, these data are provided "as is" and without any express or implied warranties, including, without limitation, the implied warranties or merchantability and fitness for a particular purpose. Also, use of trade names or commercial products in this metadata is solely for the purpose of providing specific information, and does not imply recommendation or endorsement by the US Government. Any downloading and use of these data signifies a user's agreement to comprehension and compliance of the U.S. Geological Survey, National Wetlands Research Center Standard Disclaimer. Insure all portions of metadata are read and clearly understood before using these data in order to protect both user and U.S. Geological Survey, National Wetlands Research Center interests.

  4. How can I download or order the data?


  1. Who distributes the data set? (Distributor 2 of 2)

    Louisiana Oil Spill Coordinator's Office
    c/o David Gisclair
    Technical Assistance Program (TAP) Director
    Louisiana Oil Spill Coordinator's Office
    Baton Rouge, Louisiana 70804
    USA

    (225) 219-5800 (voice)
    (225) 219-5802 (FAX)
    david.gisclair@la.gov

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

    pipelines_la_usgs_1999

  3. What legal disclaimers am I supposed to read?

    The data herein, including but not limited to geographic data, tabular data, analytical data, electronic data structures or files, are provided "as is" without warranty of any kind, either expressed or implied, or statutory, including, but not limited to, the implied warranties or merchantability and fitness for a particular purpose. The entire risk as to the quality and performance of the data is assumed by the user. No guarantee of accuracy is granted, nor is any responsibility for reliance thereon assumed. In no event shall the Louisiana Oil Spill Coordinator's Office (LOSCO) be liable for direct, indirect, incidental, consequential or special damages of any kind, including, but not limited to, loss of anticipated profits or benefits arising out of use of or reliance on the data. The LOSCO does not accept liability for any damages or misrepresentation caused by inaccuracies in the data or as a result of changes to the data caused by system transfers or other transformations or conversions, nor is there responsibility assumed to maintain the data in any manner or form.

    These data have been developed from the best available sources. Although efforts have been made to ensure that the data are accurate and reliable, errors and variable conditions originating from physical sources used to develop the data may be reflected in the data supplied. Users must be aware of these conditions and bear responsibility for the appropriate use of the information with respect to possible errors, scale, resolution, rectification, positional accuracy, development methodology, time period, environmental and climatic conditions and other circumstances specific to these data. The user is responsible for understanding the accuracy limitations of the data provided herein. The burden for determining fitness for use lies entirely with the user. The user should refer to the accompanying metadata notes for a description of the data and data development procedures.

    Although these data have been processed successfully on computers at the LOSCO, no guarantee, expressed or implied, is made by LOSCO regarding the use of these data on any other system, nor does the act of distribution constitute or imply any such warranty. Distribution of these data is intended for information purposes and should not be considered authoritative for navigational, engineering, legal and other site-specific uses

  4. How can I download or order the data?


Who wrote the metadata?

Dates:
Last modified: 21-Aug-2007
Last Reviewed: 02-Oct-2001
Metadata author:
Helena Schaefer
U.S. Geological Survey, National Wetlands Research Center
Geographer
700 Cajundome Blvd
Lafayette, Louisiana 70506
USA

337-266-8696 (voice)
337-266-8616 (FAX)
helena_schaefer@usgs.gov

Hours_of_Service: 8:00 am to 4:00 pm CST Monday thru Friday
Metadata standard:
FGDC Content Standards for Digital Geospatial Metadata (FGDC-STD-001-1998)
Metadata extensions used:


This page is <http://lagic.lsu.edu/data/losco/pipelines_la_usgs_1999_faq.html>
LA Geographic Information Center (LAGIC)
Generated by mp version 2.9.2 on Mon Oct 01 15:04:40 2007