SDETrims.DBO.Hydro_SWQMS

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Frequently-anticipated questions:

What does this data set describe?

Title: SDETrims.DBO.Hydro_SWQMS
Abstract:
This layer contains active and historical TCEQ Surface Water Quality Monitoring Stations for the entire state of Texas. The locations for this layer were obtained from TCEQ surface water quality monitoring programs and from other entities including but not limited to: Texas Commission on Environmental Quality (TCEQ), or predecessor agencies Engineering/Environmental firms U.S. Geological Survey (USGS) Texas Department of Health (TDH) Councils of Governments Local Governments River Authorities and Utility Districts Texas Parks and Wildlife Department (TPWD) Railroad Commission of Texas (RRC) U.S. Army Corps of Engineers (USACE) Texas Institute of Applied Environmental Research (TIAER) University of Texas Marine Science Institute (UTMSI) Texas A & M University Corpus Christi Center for Coastal Studies (TAMUCC CCS) Underground Water Conservation Districts International Boundary and Water Commission (IBWC) This layer was built using the best existing location data available from these sources. All location data has been reviewed by the custodian, but some errors may still remain. If data users identify errors, they are encouraged to provide details to the custodian to facilitate correction.
  1. How should this data set be cited?

    Texas Commission on Environmental Quality, Unpublished Material, SDETrims.DBO.Hydro_SWQMS: Texas Commission on Environmental Quality, Austin, Texas.

    Online Links:

    • Service=sde:sqlserver:CHUCKNORRIS; Database=SDETrims; Version=dbo.DEFAULT

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -98.677109
    East_Bounding_Coordinate: -94.643692
    North_Bounding_Coordinate: 33.696835
    South_Bounding_Coordinate: 29.772499

  3. What does it look like?

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

    Calendar_Date: January 12, 2006
    Currentness_Reference: publication date

  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?

      This is a Vector data set. It contains the following vector data types (SDTS terminology):

      • Entity point (1029)

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

      Horizontal positions are specified in geographic coordinates, that is, latitude and longitude. Latitudes are given to the nearest 0.000000. Longitudes are given to the nearest 0.000000. Latitude and longitude values are specified in Decimal degrees.

      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?

    SDETrims.DBO.Hydro_SWQMS
    Active and historical surface water quality monitoring stations used by the Texas Commission on Environmental Quality in Texas, surrounding states, and Mexico.

    seg_id
    EPA river reach ID. (Source: EPA, TCEQ)

    OBJECTID
    TCEQ-specific station type. (Source: A modified subset of EPA stream station type codes. A valid value list/domain applies.)

    Sequential unique whole numbers that are automatically generated.

    Shape
    Feature geometry. (Source: ESRI)

    Coordinates defining the features.

    station_id
    Unique identifier of a monitoring location. A TRACS key field. (Source: SWQM Stations)

    lat_dd
    Latitude in decimal degrees. (Source: SWQM Stations)

    long_dd
    Longitude in decimal degrees. (Source: SWQM Stations)

    epa_type5
    TCEQ-specific station type. (Source: A modified subset of EPA stream station type codes. A valid value list/domain applies.)

    short_desc
    TCEQ-specific station type. (Source: A modified subset of EPA stream station type codes. A valid value list/domain applies.)

    usgs_gauge
    Closest associated TCEQ classified stream segment ID. (Source: TCEQ, TCEQ)

    epa_type3
    TCEQ-specific station type. (Source: A modified subset of EPA stream station type codes. A valid value list/domain applies.)

    on_seg_flg
    On/Off TCEQ classified stream segment flag. (Source: TCEQ)

    epa_type4
    TCEQ Region ID (Source: TCEQ and predecessor agencies. TWC (Texas Water Commission) District = current TCEQ regions. Based on county boundaries.)

    epa_type1
    TCEQ-specific station type. (Source: A modified subset of EPA stream station type codes. A valid value list/domain applies.)

    epa_type2
    Hydrologic Unit Code, 8-digit (Source: EPA River Reach File 3)

    basin_id
    Long description. (Source: Longer narrative description of the station location.)

    cnty_nme
    Country name. (Source: TCEQ)

    station_nu
    SWQM TRACS legacy station number. (Source: Old tracking number, no longer used.)

    hydr_unit_
    TCEQ-specific station type. (Source: A modified subset of EPA stream station type codes. A valid value list/domain applies.)

    twc_dist_i
    Location description (extra field). (Source: TCEQ)

    eco_region
    Texas county name. (Source: TCEQ)

    stream_seq
    Internal feature number. (Source: ESRI)

    Sequential unique whole numbers that are automatically generated.

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?

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

    Elizabeth Fawcett
    Texas Commission on Environmental Quality, Office of Compliance and Enforcement, Monitoring Operations Division, Data Management and Quality Assurance Section
    Monitoring Data/GIS Specialist
    P.O. Box 13087 (MC-165)
    Austin, Texas 78711-3087
    USA

    (512) 239-3966 (voice)
    (512) 239-1605 (FAX)
    efawcett@tceq.state.tx.us

    Hours_of_Service:
    7:00 AM to 5:30 PM Monday through Thursday, excluding Texas and Federal holidays.
    Contact_Instructions: E-mail is preferred.

Why was the data set created?

This dataset is intended for general purpose use, to determine locations of current and historical surface water quality monitoring stations as maintained by TCEQ. It is intended for use in planning future monitoring efforts and for reference when requesting surface water quality monitoring data from the TCEQ.

How was the data set created?

  1. From what previous works were the data drawn?

    SWQM Stations (source 1 of 1)
    Texas Commission on Environmental Quality, October 18, 2005, TCEQ Surface Water Quality Monitoring Stations.

    Type_of_Source_Media: Relational Database
    Source_Scale_Denominator: None.
    Source_Contribution:
    All records are maintained by the dataset custodian. All known inaccuracies and omissions have been corrected, though some may still exist. Those who identify errors within the dataset are urged to contact the data custodian to initiate a correction.

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

    Date: 01-Jun-2003 (process 1 of 4)
    Latitude and longitude were corrected to fall in the appropriate location, based on existing site descriptions and original Station Location Request (SLOC) maps. In some cases, where there was no SLOC record, the description lacked specificity, and no record of a monitoring entity using the station recently existed in TRACS, the description was simply enhanced to better describe the existing lat/long. All missing values (most frequently HUC-8, short description, station type, and county information) were added to create complete records. Additional metadata (accuracy and datum information, for example) previously absent were generated to complete the dataset.

    Data sources used in this process:

    • SWQM Stations

    Date: 06-Aug-2004 (process 2 of 4)
    ArcGIS software is used to create a point shapefile from ASCII or Access data extracted from the TRACS database.

    Data sources used in this process:

    • SWQM TRACS

    (process 3 of 4)
    Metadata imported.

    Data sources used in this process:

    • P:\SLOC_stuff\SWQM_Stations_12172005.shp.xml

    (process 4 of 4)
    Dataset copied.

    Data sources used in this process:

  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?

    All records are maintained by the dataset custodian. All known inaccuracies and omissions have been corrected, though some may still exist. Those who identify errors within the dataset are urged to contact the data custodian to initiate a correction.

  2. How accurate are the geographic locations?

    Beginning in June of 2003, a project to verify and update all SWQM station records to meet TCEQ locational data standards was implemented. A team within the Data Management and Quality Assurance Section at the TCEQ used the most recent available USGS 7.5 minute topographic quadrangles and 1-meter (or better) resolution digital orthophoto quadrangles (DOQQs) to map, verify, correct, and augment the station records from TRACS. This dataset is the result of this review.

  3. How accurate are the heights or depths?

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

    All records are maintained by the dataset custodian. All known inaccuracies and omissions have been corrected, though some may still exist. Those who identify errors within the dataset are urged to contact the data custodian to initiate a correction.

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

    All data are generated by request of monitoring entities providing surface water quality monitoring data to the TCEQ. These requests for addition of new or changes to existing station records are reviewed and approved by the custodian of this dataset. These data are not consistent with the station inventory in the TCEQ Regulatory Activities and Compliance System (TRACS) database and in the case of conflicts should be considered primanry.

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:
None. Acknowledgment of the Texas Commission on Environmental Quality in products derived from this dataset would be appreciated.

  1. Who distributes the data set?[Distributor contact information not provided.]

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

    Downloadable Data

  3. What legal disclaimers am I supposed to read?

    Cite the TCEQ as data owner and publisher

  4. How can I download or order the data?

Who wrote the metadata?

Dates:
Last modified: 20-Aug-2007
Metadata author:
Elizabeth Fawcett
Texas Commission on Environmental Quality, Office of Compliance and Enforcement, Monitoring Operations Division, Data Management and Quality Assurance Section
Monitoring Data Specialist
P.O. Box 13087 (MC-165)
Austin, Texas 78711-3087
USA

(512) 239-3966 (voice)
(512) 239-1605 (FAX)
efawcett@tceq.state.tx.us

Hours_of_Service:
7:00 AM to 5:30 PM Monday through Thursday, excluding Texas and Federal holidays.
Contact_Instructions: E-mail is preferred.
Metadata standard:
FGDC Content Standards for Digital Geospatial Metadata (FGDC-STD-001-1998)
Metadata extensions used:

Generated by mp version 2.8.6 on Mon Aug 20 13:59:27 2007