Back-Island Shorelines for the Undeveloped Areas of New Jersey's Barrier Islands, Extracted from Orthoimagery, March 9, 1991, to July 30, 2013

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Frequently anticipated questions:


What does this data set describe?

Title:
Back-Island Shorelines for the Undeveloped Areas of New Jersey's Barrier Islands, Extracted from Orthoimagery, March 9, 1991, to July 30, 2013
Abstract:
Assessing the physical change to shorelines and wetlands is critical in determining the resiliency of wetland systems that protect adjacent habitat and communities. The wetland and back-barrier shorelines of New Jersey's barrier islands changed as a result of wave action and storm surge that occurred during Hurricane Sandy, which made landfall on October 29, 2012. The impact of Hurricane Sandy will be assessed and placed in its historical context to understand the future vulnerability of wetland systems. Making these assessments will rely on data extracted from current and historical resources such as maps, aerial photographs, satellite imagery, and lidar elevation data, which document physical changes over time. This USGS Data Series publication includes several open-ocean shorelines, back-island shorelines, back-island shoreline points, sand area polygons, and sand lines for the undeveloped areas of New Jersey's barrier islands that were extracted from orthoimagery (orthoaerial photography) dated from March 9, 1991 to July 30, 2013. This data set consists of lines that were digitized at the intersection of the back-island shoreline and a set of transects spaced at 20-meter (m) intervals. The transects, nj_transects_ln_20m_utm18.shp, are included in this Data Series publication and can be accessed via the Data Download page, located at http://pubs.usgs.gov/ds/0960/_ds_data-products.html. The lines falling between the transects do not follow the natural back-island shoreline. Only one back-island shoreline/transect intersection line vector was digitized per transect. Orthoimagery of New Jersey were acquired in digital format from U.S. Department of Agriculture (USDA), U.S. Geological Survey (USGS), National Oceanic and Atmospheric Administration (NOAA), and New Jersey Geographic Information Network (NJGIN). The following list provides additional details about the orthoimagery used. The digitized back-island shorelines are organized by area (Sandy Hook, Barnegat Bay, Great Bay, Ludlum Bay, Great Channel, and Cape May) with all dates for each area compiled into one data-set (shapefile) named bshrln_<range of dates>_<area name>.shp. The orthoimage date for each line is included in the shapefile attribute table "Date" field. Date Type Source Resolution 19910309-19910313 Pan USGS, DOQQ 1 m (meter) 19950325-19950407 CIR USGS, DOQQ 1 m 20020218-20020411 CIR NJGIN 1 m* 20060805-20060613 Natural USDA, NAIP 1 m 20070318-20070415 Natural NJGIN 1 m* 20080808-20080826 Natural USDA, NAIP 1 m 20100703-20100726 Natural USDA, NAIP 1 m 20120314-20120416 RGBI NJGIN 1 m* 20121031-20121106 Natural NOAA 1 m* 20130707-20130730 Natural USDA, NAIP 1 m Pan - Panchromatic (1 band, gray scale) CIR - Color Infrared (infrared, red, green) Natural - Natural Color (red, green, blue) RGBI - Natural Color and Infrared (red, green, blue, and infrared) DOQQ - Digital Orthophoto Quarter Quads NAIP - National Agriculture Imagery Program *Resampled from 1-foot resolution imagery.
  1. How might this data set be cited?
    U.S. Geological Survey, 2015, Back-Island Shorelines for the Undeveloped Areas of New Jersey's Barrier Islands, Extracted from Orthoimagery, March 9, 1991, to July 30, 2013: U.S. Geological Survey Data Series 960, U.S. Geological Survey, St. Petersburg, Fla..

    Online Links:

  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -74.880814
    East_Bounding_Coordinate: -73.975599
    North_Bounding_Coordinate: 40.481291
    South_Bounding_Coordinate: 38.944830
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
    Beginning_Date: 09-Mar-1991
    Ending_Date: 30-Jul-2013
    Currentness_Reference:
    ground condition
  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):
      • String (321)
    2. What coordinate system is used to represent geographic features?
      Grid_Coordinate_System_Name: Universal Transverse Mercator
      Universal_Transverse_Mercator:
      UTM_Zone_Number: 18
      Transverse_Mercator:
      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 0.6096
      Ordinates (y-coordinates) are specified to the nearest 0.6096
      Planar coordinates are specified in meter
      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 6378137.0.
      The flattening of the ellipsoid used is 1/298.257222101.
  7. How does the data set describe geographic features?
    bshrln_*.shp
    Back-island shorelines hand-digitized at the intersection of 20-m spaced transect lines and the apparent back-island shorelines as seen in orthoimagery. (Source: USGS)
    FID
    Internal feature number. (Source: Esri) Sequential unique whole numbers that are automatically generated.
    Shape
    Feature geometry. (Source: Esri) Coordinates defining the features.
    Id
    User specified identifier. (Source: USGS)
    Range of values
    Minimum:1
    Maximum:321
    Date_
    Date of orthoimage source. (Source: USGS) Date in month, day, year that the image was collected. This date may represent a date range if the exact date is unknown. If that is the case, the range of dates is stated in the Note attribute.
    yyyymmdd
    Date of orthoimage source formatted as an 8-digit number representing year, month, and day. (Source: USGS) Date formatted as an 8-digit number representing year, month, and day. This date may represent a date range if the exact date is unknown. If that is the case, the range of dates is stated in the Note attribute.
    Note
    Additional information. (Source: USGS) Additional text information. If the source orthoimage was taken within a range of dates, those dates are specified here.

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
    • U.S. Geological Survey
  2. Who also contributed to the data set?
    Acknowledgment of the U.S. Geological Survey St. Petersburg Coastal and Marine Science Center Coastal and Marine Geology Program as a data source would be appreciated in products developed from these data, and such acknowledgment as is standard for citation and legal practices. Sharing of new data layers developed directly from these data would also be appreciated by the U.S. Geological Survey staff. Users should be aware that comparisons with other datasets for the same area from other time periods may be inaccurate due to inconsistencies resulting from changes in photointerpretation, mapping conventions, and digital processes over time. These data are not legal documents and are not to be used as such.
  3. To whom should users address questions about the data?
    U.S. Geological Survey
    Attn: Kristy Guy
    600 4th St. S.
    St. Petersburg, FL
    USA

    727-502-8000 (voice)
    727-502-8181 (FAX)
    kguy@usgs.gov
    Hours_of_Service: Monday through Friday 9:00 AM to 5:00 PM (Eastern Time)

Why was the data set created?

These data were extracted from orthoimagery to document the changes in the undeveloped barrier island areas of New Jersey's back-island shoreline due to Hurricane Sandy and over time since 1991. These data will aid in developing an assessment of the physical change in wetlands due to wave action and storm surge from Hurricane Sandy and in determining the resiliency of wetland systems that protect adjacent habitat and communities.

How was the data set created?

  1. From what previous works were the data drawn?
    USGS Orthoimagery (source 1 of 4)
    USGS, 2015, USGS DOQQ Orthoimagery: USGS, http://earthexplorer.usgs.gov/.

    Type_of_Source_Media: online
    Source_Contribution:
    This data source was used to hand-digitize back-island shorelines.
    USDA Orthoimagery (source 2 of 4)
    U.S. Department of Agriculture (USDA), 2015, USDA NAIP Orthoimagery: USDA, http://datagateway.nrcs.usda.gov/GDGOrder.aspx.

    Type_of_Source_Media: online
    Source_Contribution:
    This data source was used to hand-digitize back-island shorelines.
    NJGIN Orthoimagery (source 3 of 4)
    New Jersey Geographic Information Network (NJGIN), 2015, NJGIN Orthoimagery: NJGIN, https://njgin.state.nj.us/NJ_NJGINExplorer/DataDownloads.jsp.

    Type_of_Source_Media: online
    Source_Contribution:
    This data source was used to hand-digitize back-island shorelines.
    NOAA Orthoimagery (source 4 of 4)
    National Oceanic and Atmospheric Administration (NOAA), 2015, NOAA Orthoimagery: NOAA, http://storms.ngs.noaa.gov/storms/sandy/index.html.

    Type_of_Source_Media: online
    Source_Contribution:
    This data source was used to hand-digitize back-island shorelines.
  2. How were the data generated, processed, and modified?
    Date: 2015 (process 1 of 1)
    Using ArcMap 10.2 and a scale of approximately 1:2000, shore-normal transect lines spaced 20-m apart were laid over the orthoimages. A line was hand-digitized at the intersections of the apparent back-island shoreline and the transect lines. Only one back-island shoreline/transect line intersection was digitized per transect line. The orthoimagery date was added to the "Date" field in the shapefile attribute table. Person who carried out this activity:
    USGS
    600 4th St. S.
    St. Petersburg, FL
    USA

    727-502-8000 (voice)
    727-502-8181 (FAX)
    Hours_of_Service: Monday through Friday 8:00 AM to 5:00 PM (Eastern Time)
    Contact_Instructions:
    If unable to reach the contact by telephone, please leave a voice message.
    Data sources used in this process:
    • USGS Orthoimagery
    • USDA Orthoimagery
    • NJGIN Orthoimagery
    • NOAA Orthoimagery
    Data sources produced in this process:
    • bshrln_*.shp
  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?
  2. How accurate are the geographic locations?
    The horizontal accuracy of the data is unknown.
  3. How accurate are the heights or depths?
  4. Where are the gaps in the data? What is missing?
    Complete.
  5. How consistent are the relationships among the observations, including topology?
    Not all of the orthoimagery data-sets covered the entire study area. Inconsistencies due to differences in image quality should be expected. No adjustments were made for varying tide levels. The lines were digitized at a scale of approximately 1:2,000.

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:
Variability in the quality of the imagery from one date to another, from one image to another taken on the same date, and from one part of an image to another part of the same image, exists due to many factors including variation in sun angle, atmospheric conditions, season, reflectivity of the earth surface, camera angle, camera lens, camera settings, film sensitivity, water turbidity, water depth, tide level, waves, and error in image rectification. No adjustments were made to account for tide level. Public domain data from the U.S. Government are freely redistributable with proper metadata and source attribution. Please recognize the U.S. Geological Survey St. Petersburg Coastal and Marine Science Center, Coastal and Marine Geology Program as the originator of these data in future products or derivative research.
  1. Who distributes the data set? (Distributor 1 of 1)
    Kristy Guy
    U.S. Geological Survey, St. Petersburg Coastal and Marine Science Center, St. Petersburg, Fla.
    GIS/RS Analyst
    600 4th Street South
    St. Petersburg, FL
    USA

    727-502-8000 (voice)
    Hours_of_Service: Monday-Friday, 9:00-5:00 Eastern Time
  2. What's the catalog number I need to order this data set? DS 960
  3. What legal disclaimers am I supposed to read?
    Although these data were processed successfully on a computer system at the USGS, no warranty expressed or implied is made regarding the display 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. The USGS shall not be held liable for improper or incorrect use of the data described and/or contained herein. Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government.
  4. How can I download or order the data?

Who wrote the metadata?

Dates:
Last modified: 08-Jun-2016
Metadata author:
USGS
Attn: Kristy Guy
600 4th Street South
St. Petersburg, FL
USA

727-502-8000 (voice)
727-502-8181 (FAX)
kguy@usgs.gov
Hours_of_Service: Monday through Friday 9:00 AM to 5:00 PM (Eastern Time)
Metadata standard:
FGDC Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)

This page is <https://cmgds.marine.usgs.gov/catalog/spcmsc/DS960_nj_bshrln.faq.html>
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