In the late 1990s, the North Carolina Department of Environment and Natural Resources, Division of Water Quality developed a GIS data set representing point locations of intensive animal operations in North Carolina. In 2003, CGIA used digital ortho photography from 1998 to verify the DWQ points for swine operations and to identify additional swine lagoons and barns visible in the photos. The intention is to display patterns of swine operations for planning and impact analysis without including attributes of the operations. Matching points to DWQ permits, for example, would take more research and processing.
These data were created to assist governmental agencies and others in making resource management decisions through use of a Geographic Information System (GIS).
system filename : North Carolina swine lagoon locations file size = 0.5 MB The October 2003 file is the first version of this dataset.
ground condition
Acknowledgement of products derived from this data set should cite the following: The source of the North Carolina Swine Lagoon locations data is the North Carolina Corporate Geographic Database. Earlier versions of this dataset may exist. The user must be sure to use the appropriate data set for the time period of interest. While efforts have been made to ensure that these data are accurate and reliable within the state of the art, CGIA cannot assume liability for any damages or misrepresentation caused by any inaccuracies in the data or as a result of changes to the data caused by system transfers.
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This set is based in part on data from the NC Department of Environment and Natural Resources, Division of Water Quality, Water Quality Section 512 N. Salisbury Street, Raleigh, NC 27604-1148. CGIA verified and created point locations based on Digital Orthophoto Quarter Quads, 1998 images.
The NC DENR Water Quality Section provided the NC Center for Geographic Information and Analysis (CGIA) with a 1999 shape file of points representing registered animal operations for the State of North Carolina. The data were intended for planning purposes and were not verified or documented for GIS. In 2003, CGIA overlayed the point locations with orthophotos from 1998 to verify apparent lagoons in the photos. Points not within a few hundred feet of a lagoon were excluded. Additional points were added interactively to coincide with the center of apparent lagoons associated with apparent swine facilities. Accuracy rests in part on the judgments by the technician and the project manager in the process of identifying lagoons and adjacent swine barns. Some of the apparent lagoons and barns may have been operations involving other animals. Except for the county location, all other attributes from the original file were dropped becasuse of the lack of confidence in the actual nature and status of intensive animal operations associated with apparent lagoon locations.
Using ESRI's ARC/INFO Arcview software, a point shapefile was created.
These point locations represent the approximate center of each apparent lagoon associated with swine operations as observed on digital orhthophoto quarter quads throughout North Carolina.
The point locations are in the approximate center of apparent lagoons visibile on orthophotos of 1-meter resolution. This exceeds National Mapping Standards.
CGIA verified lagoon locations based on orthophotos of 1-meter resolution.
In March 2003, for selected counties, CGIA used 1998 color orthophotography (DOQQ, Color Infrared) to verify the location of the points representing animal operations. Swine operations typically consist of long rectangular metallic barns and rectangular waste lagoons, both of which are visible in the orthophotos (1-meter resolution). CGIA added a point for each swine lagoon location that could be verified from the orthophotography. As of August 6, 2003, the verified points had not been reviewed by the Division of Water Quality and attributes had not been updated. This method does not account for new operations after 1998-99 and cannot assure completeness or accuracy for operations existing before 1999. More information about animal operation permits is available from the Division of Water Quality, http://h2o.enr.state.nc.us/ndpu/ndpuapps.html CGIA updates the digital file as needed.
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Dataset copied.
Internal feature number.
ESRI
County name
NC CGIA
Feature geometry.
ESRI
Internal feature number.
ESRI
County Number of county where facility is located
NC CGIA
Feature geometry.
ESRI
The only attributes provided are county number and county name. CGIA could not identify specific animal operations from orthophotos. The points are intended to display the pattern of operations and the approximate location in the context of other GIS data.
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NCCGIA is charged with the development and maintenance of the State's corporate geographic database and, in cooperation with other mapping organizations, is committed to offering its users accurate, useful, and current information about the state. Although every effort has been made to ensure the accuracy of information, errors and conditions originating from physical sources used to develop the corporate database may be reflected in the data supplied. The client must be aware of data conditions and bear responsibility for the appropriate use of the information with respect to possible errors, original map scale, collection methodology, currency of data, and other conditions specific to certain data. NCCGIA does not support secondary distribution of these data. The use of trade names or commercial products does not constitute their endorsement by the NCCGIA or North Carolina State Government.
FOR DIGITAL OR NON-DIGITAL DATA, Contact NC CGIA, Data Distribution to order data, Phone 919.733.2090 Email dataq@cgia.state.nc.us. Web Page order form: http://www.cgia.state.nc.us/cgdb/index.html.
Data creation and large data analysis jobs contact Database Administration P:(919)733-2090. All data are available through standard ordering procedures on a cost recovery basis.
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