wri964195wlmap_stmpts

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Frequently anticipated questions:


What does this data set describe?

Title: wri964195wlmap_stmpts
Abstract:
The water-levels from streams data (wri964195wlmap_stmpts, points) includes stream and surface water (lakes, ponds) level measurements that were made specifically for the Salem River study, using a set of strategically selected locations that, along with water-levels from wells, provided control for construction of an interpretive water-table contour map. Water-level measurements were selected where a culvert, bridge, or concrete berm provided ready accessibility and a reference point, and especially where there was a lack of other water-level control points. In upstream areas, an effort was made to bracket measurement points between a dry point and a flowing point, thus indicating a stream interval in which start-of-flow can be inferred. All stream and surface-water-level measurement sites were entered into the project database. This data layer is the same as the stream-water-level data and interpretation presented in Johnson and Charles (1997), table 2-1 and figure 2.1, respectively. The study area includes the entire basins of Salem River, Raccoon Creek, Oldmans Creek, Alloway Creek, and Stow Creek, and parts of the New Jersey counties of Cumberland, Gloucester, and Salem. The horizontal datum of the water-levels from streams data layer is NAD 83, and the vertical datum is NGVD 29. The water-levels from streams data is one of four data layers used to present the water-level information for the Salem River study area. The four geographic data layers were developed at a scale of 1:24,000, and consist of; (1) the study area boundary (wri964195wlmap_bndry, polygon), (2) water-levels from wells (wri964195wlmap_gwpts, points), (3) water-levels from streams (wri964195wlmap_stmpts, points), and (4) an interpretive water-table contour map (wri964195wlmap_wlcont, lines).
The water-level information represents one part (sheet 2 of 5) of a comprehensive assessment of the hydrology of the unconfined aquifer system in the Salem River study area. The other four sheets of this report are not available in geographic data layer form, but they can be downloaded in PDF format from the complete original report cited herein. The other four sheets comprise information on (1) the hydrogeology and description of the study area, (2) stream discharge and climate data, (3) water quality, and (4) a detailed water-use and water-budget analysis. The digital data sets that support unconfined-aquifer water-levels and interpretations for the Salem River study area are derived from one of nine hard copy published reports which contain similar data and information across other areas of southern New Jersey. Digital data sets for the unconfined-aquifer water-level and interpretive portions from all nine reports are being simultaneously released, motivated by development of an interactive web-viewer tool that enables convenient online viewing of the information (http://nj.usgs.gov/special/web_mapper/). Eight of the nine published reports are from a comprehensive unconfined-aquifer study series; Great Egg Harbor River (Watt and Johnson, 1992), Toms River (Watt and others, 1994), Upper Maurice River (Lacombe and Rosman, 1995), Mullica River (Johnson and Watt, 1996), Salem River (Johnson and Charles, 1997), Maurice River (Charles and others, 2001), Rancocas Creek (Watt and others, 2002), and Atlantic Coastal (Gordon, 2004). The ninth report that contains unconfined-aquifer water-level data and an interpretation is from a comprehensive water-resource study in Cape May County (Lacombe and Carleton, 2002).
  1. How should this data set be cited?

    U.S. Department of the Interior, U.S. Geological Survey, Johnson, M.L. and Charles, E.G., Authors, 19971231, wri964195wlmap_stmpts.

    Other_Citation_Details:
    PROJECTED COORDINATE SYSTEM UTM NAD 83; original projection was UTM NAD 27.

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -75.497671
    East_Bounding_Coordinate: -75.147852
    North_Bounding_Coordinate: 39.770378
    South_Bounding_Coordinate: 39.432141

  3. What does it look like?

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

    Beginning_Date: 02-Dec-1993
    Ending_Date: 09-Dec-1993
    Ending_Time: 235900
    Currentness_Reference:
    Areal span, time span, and vertical span represented by the measured water levels.

  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 (175)

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

      The map projection used is NAD 1983 UTM Zone 18N.

      Projection parameters:
      Scale_Factor_at_Central_Meridian: 0.9996
      Longitude_of_Central_Meridian: -75.0
      Latitude_of_Projection_Origin: 0.0
      False_Easting: 500000.0
      False_Northing: 0.0

      Planar coordinates are encoded using coordinate pair
      Abscissae (x-coordinates) are specified to the nearest 0.0001
      Ordinates (y-coordinates) are specified to the nearest 0.0001
      Planar coordinates are specified in meter

      The horizontal datum used is North American 1983.
      The ellipsoid used is GRS 1980.
      The semi-major axis of the ellipsoid used is 6378137.0.
      The flattening of the ellipsoid used is 1/298.257222101.

  7. How does the data set describe geographic features?

    wri964195wlmap_stmpts
    Stream and surface water points used to develop water table contour map in Salem River study area. (Source: USGS)

    OBJECTID
    Internal feature number. (Source: ESRI)

    Sequential unique whole numbers that are automatically generated.

    SHAPE
    Feature geometry. (Source: ESRI)

    Coordinates defining the features.

    Site_Number
    Surface water site number (Source: USGS)

    Unique project ID assigned by USGS and only used for the Salem River study.

    Latitude
    Coordinate format: Degrees, minutes, seconds (Source: USGS)

    Unique coordinate defining the latitude of the feature.

    Longitude
    Coordinate format: degrees, minutes, seconds (Source: USGS)

    Unique coordinate defining the longitude of the feature.

    Date_Water_Level_Measured
    Date that surface water level measurement was made (Source: USGS)

    Unique date that manual surface-water level measurement was made as part of project.

    Elevation_of_Water_Level
    Elevation of water, feet above vertical datum (NGVD 29). (Source: USGS)

    Unique value of stream or surface water elevation in feet above NGVD 29, calculated from estimated elevation of land surface and manual measurement of depth to water.


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?

    Johnson, M.L. and Charles, E.G., 1997, Hydrology of the unconfined aquifer system, Salem River Area: Salem River and Raccoon, Oldmans, Alloway, and Stow Creek Basins, New Jersey, 1993-94, U.S. Geological Survey Water-Resources Investigations Report 96-4195, 5 sheets. (sheet 2 of 5, table 2-2, figure 2-1) http://pubs.er.usgs.gov/publication/wri964195

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

    U.S. Department of the Interior, U.S. Geological Survey
    3450 Princeton Pike, Suite 110
    Lawrenceville, New Jersey 08648
    US

    (609) 771-3900 (voice)
    (609) 771-3915 (FAX)
    dc_nj@usgs.gov

    Hours_of_Service: 8:00AM-4:30PM, Monday-Friday
    Contact_Instructions:
    Go to the website: http://nj.usgs.gov/ Or email: dc_nj@usgs.gov Or phone: (609) 771-3900


Why was the data set created?

The water-levels from streams data for the Salem River study includes stream and surface water levels, and related site information that were compiled, along with water levels measured in wells, to construct a water-table contour map. The water-table contour map can be used to provide an interpretive assessment of depth to water, water-table altitude, water-table gradients, and the direction of groundwater flow within the unconfined aquifer system. The study was performed in cooperation with the New Jersey Department of Environmental Protection for their purpose of developing a scientific basis to help address environmental, water-resource management and planning, water availability, water use, and water quality questions.


How was the data set created?

  1. From what previous works were the data drawn?

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

  3. What similar or related data should the user be aware of?


How reliable are the data; what problems remain in the data set?


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:
Although these data have been processed successfully on a computer system at the U.S. Geological Survey, 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. It is also strongly recommended that careful attention be paid to the constraints of the metadata file associated with these data to evaluate data set limitations, restrictions or intended use. The U.S. Geological Survey shall not be held liable for improper or incorrect use of the data described and/or contained herein.


Who wrote the metadata?

Dates:
Last modified: 10-Jun-2014
Metadata author:
U.S. Department of the Interior, U.S. Geological Survey
Attn: Emmanuel Charles, Jessica Centinaro, Leila Johnson
3450 Princeton Pike, Suite 110
Lawrenceville, New Jersey 08648
US

(609) 771-3900 (voice)
(609) 771-3915 (FAX)
dc_nj@usgs.gov

Hours_of_Service: 8:00AM-4:30PM, Monday-Friday
Contact_Instructions:
Go to the website: http://nj.usgs.gov/ Or email: dc_nj@usgs.gov Or phone: (609) 771-3900
Metadata standard:
FGDC Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)


Generated by mp version 2.9.26 on Tue Jun 24 16:11:19 2014