approx file size = 0.34 mb
Revisions and updates to this layer include:
3) filename:bmr502 CGIA received from DWQ an ArcView Shapefile of benthic monitoring sites through March 1, 2002. This versions omitted the basinsite (which indicated whether a site is part of a routine sampling schedule) attribute.
2) filename: bmr900 CGIA received from DWQ an excel spreadsheet with a list of benthic monitoring sites through November 15, 2000. This spreadsheet contained many latitude and longitude corrections from the original layer released by CGIA. This version includes two additional attributes: basinsite, which indicates whether a site is part of a routine sampling schedule, and sample type.
1) filename: bmr600 The June 15, 2000 version was the
first version released to the database.
Original was data received and processed September 1998.
Corrections to lat/longs were made in October 1998.
Minor latitude attribute correction was made June 2000.
(The coverage's projection was also defined.)
NC DENR Clean Water Management Trust Fund, 200206, Benthic Monitoring Results: NC DENR Clean Water Management Trust Fund, Raleigh, North Carolina.Online Links:
- Metadata - <http://www.cgia.state.nc.us/cgdb/index.html>
Planar coordinates are encoded using Coordinate pair
Abscissae (x-coordinates) are specified to the nearest 0.1
Ordinates (y-coordinates) are specified to the nearest 0.1
Planar coordinates are specified in Meters
The horizontal datum used is North American Datum of 1983.
The ellipsoid used is Geodetic Reference System 1980.
The semi-major axis of the ellipsoid used is 6378137 meters.
The flattening of the ellipsoid used is 1/298.257.
County names vary in length.
River basin names vary in length and number of words.
| Range of values | |
|---|---|
| Minimum: | 0 |
| Maximum: | 50 |
Descriptions vary in length and number of words.
Stream names vary in length and number of words.
| Range of values | |
|---|---|
| Minimum: | 335255 |
| Maximum: | 363411 |
| Range of values | |
|---|---|
| Minimum: | 753235 |
| Maximum: | 841650 |
| Value | Definition |
|---|---|
| Full Scale | |
| EPT | |
| Boat | |
| Swamp | |
| Qual4 | |
| Est Qn | |
| Range of values | |
|---|---|
| Minimum: | 0 |
| Maximum: | 200011 |
| Value | Definition |
|---|---|
| Excellent | Waters with very diverse benthic macroinvertebrate populations, including many pollutant intolerant species. |
| Good | Waters with healthy but less diverse benthic macroinvertebrate populations and fewer pollutant intolerant species. |
| Good-Fair | Waters with average benthic macroinvertebrate populations, numbers & diversity. |
| Fair | Waters with below average diversity or abundance of benthic macroinvertebrate populations. Tolerate species begin to dominate community. |
| Poor | Waters with very limited benthic macroinvertebrate populations, low diversity and/or abundance. Tolerant species are generally dominant. |
| Not Rated | Locations that have been sampled, but not assigned a water quality rating |
BMR.PAT Point Attribute Table
COLUMN ITEM NAME WIDTH OUTPUT TYPE DEC DESCRIPTION
17 CARD_NU 8 11 F 0 Collection card number
25 COUNTY 14 14 C - County name
39 BASIN 9 9 C - River basin name abbreviation
48 SUBBASIN 8 12 F 0 Sub-basin #
56 LOCATION 15 15 C - Site description
71 WATERBODY 17 17 C - Stream name
88 LATITUDE 8 9 F 0 North-south georeference
96 LONGITUDE 8 12 F 0 East-west georeference
104 COLLECTION 8 10 D - Collection date
112 BIOCLASS 9 9 C - Water quality rating
NC Dept. of Environment and Naural ResourcesDiv. of Water Quality
Water Quality Section
Environmental Sciences Branch
512 N. Salisbury Street, Raleigh 27604-1148
Dept. of Environment & Natural Resources,
Clean Water Management Trust Fund
1615 Mail Service Center
Raleigh, NC 27699-1615
North Carolina Center for Geographic Information and Analysis
Dept. of Environment & Natural Resources
301 North Wilmington Street, Suite 700
Raleigh, NC 27601-2825
(919) 733-6946 (voice)
Trish.MacPherson@ncmail.net
This data was created to assist governmental agencies and others in making resource management decisions through use of a Geographic Information System (GIS).
NC DENR - Div. of Water Quality, Biological Assessment Unit, 200205, Benthic monitoring results: NC DENR - Div. of Water Quality, Biological Assessment Unit, Raleigh, North Carolina.
NC Center for Geographic Information and Analysis, 200206, Benthic monitoring results: NC Center for Geographic Information and Analysis, Raleigh, North Carolina.
The NC DENR-DWQ maintained the biological records in a 4D database with no geographic reference. The database includes attributes for river basin, subbasin, site description, collection date and water quality rating. The water quality ratings are assigned based on an analysis of field samplings using standard methodologies. The database was converted to an EXCEL spreadsheet for conversion to a GIS coverage. The digital file is updated as changes occur.
The NC DENR-DWQ maintained the biological data in a 4D database with no geographic reference. The monitoring points were manually mapped onto 24k USGS paper topographic maps which meet National Map Accuracy Standards, using a best estimate with reference to surrounding features. Latitudes and longitudes were generated using a grid overlay. Points were checked for accuracy against NC Corporate GIS Data layers. In 1998 "TopoScout" software was purchased. The software generates lat/longs for the location of the cursor. DWQ will continue to refine the georeferencing of the sampling sites. DWQ converted the 4D data into an EXCEL spreadsheet for conversion to a GIS coverage. NCCGIA converted this dataset to a GIS coverage using ESRI's ARC/INFO software on UNIX. The digital file is updated as changes occur.
These data represent the locations and results of the benthic macroinvertebrate sampling conducted and documented by the NCDWQ. Each point has an associated water quality rating based on the sampling results.
Using ESRI's ARC/INFO GIS software, the dataset was built for point topology using the "build" command. Topology has not been edited since the last "build" or "clean"
Are there legal restrictions on access or use of the data?
- Access_Constraints: None
- Use_Constraints:
- Acknowledgement of products derived from this data set should cite the following: The source of the benthic monitoring 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.
(919) 733-2090 (voice)
(919) 715-0725 (FAX)
dataq@cgia.state.nc.us
Benthic Monitoring Results
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 this data. The use of trade names or commercial products does not constitute their endorsement by the NCCGIA or North Carolina State Government.
Data creation and large data analysis jobs contact Database Administration P:(919)733-2090. All data is available through standard ordering procedures on a cost recovery basis.
All formats supplied are created using ARC/INFO GIS software on Unix workstations. Other formats are available. Format compatibility is the user's responsibility. For more information on formats and media, use a web browser: <http://www.cgia.state.nc.us/cost.html>
(919) 733-2090 (voice)
(919) 715-0725 (FAX)
dataq@cgia.state.nc.us