United States Geological Survey, Biological Resources Division's, National , 19990101, Pipelines in Louisiana, Geographic NAD83, USGS (1999) [pipelines_la_usgs_1999].
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.
Coordinates defining the features.
Sequential unique whole numbers that are automatically generated.
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.
To extract a coverage of pipelines within the State of Louisiana to the State boundaries.
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.
Data sources used in this process:
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.
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.
The accuracy of this data meets the accuracy of the National Map Accuracy Standards.
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.
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.
The vector data (arcs) have been cleaned in an editing environment. Each line has one and only one attribute.
Are there legal restrictions on access or use of the data?
- 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.
- 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.
Pipelines of the State of Louisiana
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.
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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
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