onemap_prod.SDEADMIN.benthic

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Frequently-anticipated questions:

What does this data set describe?

Title: onemap_prod.SDEADMIN.benthic
Abstract:
The North Carolina Department of Environment and Natural Resources, Division of Water Quality, with funding from the NC Clean Water Management Trust Fund and in cooperation with the NC Center for Geographic Information and Analysis, developed the digital benthic monitoring data to enhance water quality assessment & plan review of Trust Fund project applications. This file identifies points where benthic macroinvertebrate monitoring has occurred. This file enables users to review the current rating of water quality for each sampling site based on the monitoring results.
Supplemental_Information:
system filename : bmr approx file size = 0.34 mb
Revisions and updates to this layer include: 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.)
  1. How should this data set be cited?

    NC DENR Division of Water Quali, Envrionmental Sciences Branch, 20030429, onemap_prod.SDEADMIN.benthic: NC DENR Clean Water Management Trust Fund, Raleigh, North Carolina.

    Online Links:

    Other_Citation_Details: NCCGIA distributes this dataset by request

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -84.364992
    East_Bounding_Coordinate: -76.106074
    North_Bounding_Coordinate: 36.589509
    South_Bounding_Coordinate: 33.832316

  3. What does it look like?

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

    Calendar_Date: REQUIRED: The year (and optionally month, or month and day) for which the data set corresponds to the ground.
    Currentness_Reference: Data collection dates

  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:
      County name, River basin name, sub-basin #, Card number, Lat/long
      This is a Vector data set. It contains the following vector data types (SDTS terminology):
      • Entity point (4818)

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

      Grid_Coordinate_System_Name: State Plane Coordinate System 1983
      State_Plane_Coordinate_System:
      SPCS_Zone_Identifier: 3200
      Lambert_Conformal_Conic:
      Standard_Parallel: 34.333333
      Standard_Parallel: 36.166667
      Longitude_of_Central_Meridian: -79.000000
      Latitude_of_Projection_Origin: 33.750000
      False_Easting: 609601.220000
      False_Northing: 0.000000

      Planar coordinates are encoded using coordinate pair
      Abscissae (x-coordinates) are specified to the nearest 0.002048
      Ordinates (y-coordinates) are specified to the nearest 0.002048
      Planar coordinates are specified in meters

      The horizontal datum used is North American Datum of 1983.
      The ellipsoid used is Geodetic Reference System 80.
      The semi-major axis of the ellipsoid used is 6378137.000000.
      The flattening of the ellipsoid used is 1/298.257222.

      Vertical_Coordinate_System_Definition:
      Altitude_System_Definition:
      Altitude_Resolution: 1.000000
      Altitude_Encoding_Method:
      Explicit elevation coordinate included with horizontal coordinates

  7. How does the data set describe geographic features?

    onemap_prod.SDEADMIN.benthic
    Water quality ratings for specific sampling locations. (Source: NC DENR- Div. of Water Quality, Biological Assessment Unit)

    BASINSITE
    A yes or no indication of whether a site is sampled routinely as part of the Basinwide Assessment Program. If no value is given, the user should assume "no" (Source: NC DENR - Div. of Water Quality, Biological Assessment Unit)

    Frequency of measurement: None planned

    ValueDefinition
    yesroutine sampling
    nosampling is not routine

    DATE
    Date of field sample (Source: NC DENR - Div. of Water Quality, Biological Assessment Unit)

    Frequency of measurement: As needed

    Range of values
    Minimum:0
    Maximum:200211

    BIOCLASS
    Water quality classification based on biological monitoring (Source: NC DENR Div. of Water Quality, Biological Assessment Unit)

    Frequency of measurement: None planned

    ValueDefinition
    ExcellentWaters with very diverse benthic macroinvertebrate populations, including many pollutant intolerant species.
    GoodWaters with healthy but less diverse benthic macroinvertebrate populations and fewer pollutant intolerant species.
    Good-FairWaters with average benthic macroinvertebrate populations, numbers & diversity.
    FairWaters with below average diversity or abundance of benthic macroinvertebrate populations. Tolerate species begin to dominate community.
    PoorWaters with very limited benthic macroinvertebrate populations, low diversity and/or abundance. Tolerant species are generally dominant.
    Not RatedLocations that have been sampled, but not assigned a water quality rating

    LOCATION
    Site description (e.g., SR 1203) for sampling location (Source: NC DENR - Div. of Water Quality)

    Frequency of measurement: None planned

    Descriptions vary in length and number of words.

    LATITUDE
    Measurement of the angle from the Earth's center to a point on the Earth's surface measured in a north-south direction. (Source: NC DENR - Div. of Water Quality, Biological Assessment Unit)

    Frequency of measurement: None planned

    Range of values
    Minimum:335255
    Maximum:363411

    COUNTY
    County names (Source: State of North Carolina)

    Frequency of measurement: None planned

    County names vary in length.

    Shape
    Feature geometry. (Source: ESRI)

    Coordinates defining the features.

    LONGITUDE
    Measurement of the angle from the Earth's center to a point on the Earth's surface measured in a east-west direction. (Source: NC DENR - Div. of Water Quality, Biological Assessment Unit)

    Frequency of measurement: None planned

    Range of values
    Minimum:753235
    Maximum:841650

    WATERBODY
    Name of stream (Source: NC DENR - Div. of Water Quality)

    Frequency of measurement: As needed

    Stream names vary in length and number of words.

    TOTAL_TAXA
    not sure (Source: CGIA)

    values vary by location

    TOT_INTOL_
    not sure (Source: CGIA)

    values vary by location

    SUBBASIN_
    Sub-basin name (Source: CGIA)

    names vary by sub-basin

    BIOTIC_IND
    not sure (Source: CGIA)

    values vary by location

    SAMPLE_TYP
    Sample type (Source: NC Division of Water Quality)

    ValueDefinition
    boatnot sure
    EPTnot sure
    Full Scalenot sure
    Qual 4or QUAL 4; not sure
    Qual 5not sure
    Swampnot sure

    DD_LAT
    Latitude in decimal degrees (Source: CGIA)

    values vary by location

    ECOREGION
    Ecological Region (Source: CGIA)

    ValueDefinition
    CPTnot sure
    EPTnot sure
    NCPnot sure
    NMTnot sure
    SCPnot sure
    SHSnot sure
    SMTnot sure
    SPTnot sure

    OBJECTID
    Internal feature number. (Source: ESRI)

    Sequential unique whole numbers that are automatically generated.

    SUBBASIN_N
    Sub-basin number (Source: CGIA)

    values vary by sub-basin

    CONVERT_

    SHAPE
    Feature geometry. (Source: ESRI)

    Coordinates defining the features.

    Entity_and_Attribute_Overview:
    A point coverage depicting stream locations sampled by the Division of Water Quality, Biological Assessment Unit. Each point includes a description of its location by county,river basin, sub-basin, location, and stream name. A latitude and longitude has been designated to geographically reference each sampling point. Each point has been assigned a water quality rating or "bioclassification" based on the quality and quantity of benthic macroinvertebrate life found at that site. The ratings are assigned on a scale of poor to excellent water quality. Bioclassifications are based on the number of taxa present and the relative pollution tolerance of each taxa. Stream and river reaches are then given a final bioclassification of Excellent, Good, Good-Fair, Fair, Poor, or Not Rated. These bioclassifications, which have been developed for major ecoregions, are used to assess the various impacts of both point source discharges and non-point source runoff. BMR.PAT Point Attribute Table COLUMN ITEM NAME WIDTH OUTPUT TYPE DEC DESCRIPTION 1 AREA 4 12 F 3 Total area in meters 5 PERIMETER 4 12 F 3 Total perimeter 9 BMR# 4 5 B - Point internal id number 13 BMR-ID 4 5 B - Point internal id number 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 SUB-BASIN 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
    Entity_and_Attribute_Detail_Citation:
    Refer to source agency for published stream classification documents and standard procedure for benthic macroinvertebrate stream sampling and assessment methods.

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?

    NC Dept. of Environment and Naural Resources Div. 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 Governor's Office Office of State Budget, Planning and Management 301 North Wilmington Street, Suite 700 Raleigh, NC 27601-2825

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

    Mark Hale
    NC DENR Division of Water Quality
    1621 Mail Service Center
    Raleigh, NC 27699-1621
    U.S.A.

    (919) 733-6946 (voice)
    mark.hale@ncmail.net

    Hours_of_Service: 8am to 5pm
    Contact_Instructions: Preferred contact is by e-mail or telephone

Why was the data set created?

These data were created to assist governmental agencies and others in making resource management decisions through use of a Geographic Information System (GIS).

How was the data set created?

  1. From what previous works were the data drawn?

    None (source 1 of 2)
    NC DENR - Div. of Water Quality, Biological Assessment Unit, 200012, Benthic monitoring results: NC DENR - Div. of Water Quality, Biological Assessment Unit, Raleigh, North Carolina.

    Other_Citation_Details: layer developed by CGIA in collaboration with DWQ.
    Type_of_Source_Media: Digital
    Source_Scale_Denominator: 24000
    Source_Contribution:
    spreadsheet with monitoring locations, identification numbers and water quality ratings

    None (source 2 of 2)
    NC Center for Geographic Information and Analysis, 200012, Benthic monitoring results: NC Center for Geographic Information and Analysis, Raleigh, North Carolina.

    Other_Citation_Details: CGIA distributes the data
    Type_of_Source_Media: Digital
    Source_Scale_Denominator: 24000
    Source_Contribution: Creation of digital coverage, and file updates.

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

    Date: 30-Sep-1998 (process 1 of 5)
    The NC DENR-DWQ mapped the monitoring points onto 24k USGS paper topographic maps. DWQ entered the sampling data into a 4D database and geographically referenced the data by latitude & longitude. DWQ converted the data to EXCEL spreadsheet. DWQ supplies CGIA with updates as they occur.

    Date: 30-Sep-1998 (process 2 of 5)
    NCCGIA coverted the spreadsheet information to a digital coverage using ESRI's ARC/INFO GIS software on UNIX, Sun Sparc workstations. Points falling outside the state boundaries were referenced and DWQ contacted for corrected latitudes & longitudes. CGIA updates the digital file as needed.

    Date: 15-Mar-2005 (process 3 of 5)
    DWQ updated a shapefile and its associated ratings data and furnished it to CGIA. CGIA checked the quality and edited the metadata.

    Person who carried out this activity:

    CGIA
    c/o Jeffrey Brown
    Project Manager
    20322 Mail Service Center
    Raleigh, NC 27699-0322
    USA

    919-715-0712 (voice)
    919-715-0725 (FAX)
    jeffrey.p.brown@ncmail.net

    Hours_of_Service: 8:00 to 5:00
    Contact_Instructions: email preferred
    (process 4 of 5)
    Metadata imported.

    Data sources used in this process:

    • C:\DOCUME~1\david\LOCALS~1\Temp\xml79E.tmp

    (process 5 of 5)
    Dataset copied.

    Data sources used in this process:

    • Server=207.192.29.55; Service=5151; Database=onemap; User=sdeadmin; Version=sde.DEFAULT

  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?

    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.

  2. How accurate are the geographic locations?

    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.

  3. How accurate are the heights or depths?

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

    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.

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

    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."

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:
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.

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

    NC Center for Geographic Information and Analysis
    Production Services
    301 North Wilmington Street, Suite 700
    Raleigh, North Carolina 27699-0322
    USA

    (919) 733-2090 (voice)
    (919) 715-0725 (FAX)
    dataq@cgia.state.nc.us

    Hours_of_Service: 8:30AM - 5:30PM
    Contact_Instructions:
    Phone and electronic mail preferred For current price information use a web browser: <http://www.cgia.state.nc.us/cost.html>
  2. What's the catalog number I need to order this data set?

    Benthic Monitoring Results

  3. What legal disclaimers am I supposed to read?

    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.

  4. How can I download or order the data?

  5. Is there some other way to get the data?

    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.

  6. What hardware or software do I need in order to use the data set?

    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>

Who wrote the metadata?

Dates:
Last modified: 02-Oct-2006
Last Reviewed: 07-Apr-2005
Metadata author:
North Carolina Center for Geographic Information and Analysis
c/o Jeffrey Brown
Database Management
301 North Wilmington Street, Suite 700
Raleigh, North Carolina 27699-0322
USA

(919) 733-2090 (voice)
(919) 715-0725 (FAX)
dataq@ncmail.net

Hours_of_Service: 8:30AM - 5:30PM
Contact_Instructions: Phone and electronic mail preferred
Metadata standard:
FGDC Content Standards for Digital Geospatial Metadata (FGDC-STD-001-1998)
Metadata extensions used:

Generated by mp version 2.9.5 on Wed Aug 27 10:29:11 2008