Long-term shoreline change rates for Rincon, Puerto Rico 1936-2006 (lt_transects.shp)

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Frequently anticipated questions:

What does this data set describe?

Title:
Long-term shoreline change rates for Rincon, Puerto Rico 1936-2006 (lt_transects.shp)
Abstract:
The 8 km of shoreline from Punta Higüero to Punta Cadena in Rincón, Puerto Rico is experiencing long-term coastal erosion. This study documents historical shoreline changes at Rincón for the period 1936-2006. Thirteen historical shoreline positions were compiled from existing data, new orthophotography, and GPS field surveys. Shoreline vectors represent the high water line at the time of the survey.
  1. How might this data set be cited?
    Thieler, E.R., 2007, Long-term shoreline change rates for Rincon, Puerto Rico 1936-2006 (lt_transects.shp): Open-File Report 2007-1017, U.S. Geological Survey, Coastal and Marine Geology Program, Woods Hole Science Center, Woods Hole, MA.

    Online Links:

    This is part of the following larger work.

    Thieler, E.R., Rodriguez, R.W., and Himmelstoss, E.A., 2007, Historical Shoreline Changes at Rincon, Puerto Rico, 1936-2006: Open-File Report 2007-1017, U.S. Geological Survey, Coastal and Marine Geology Program, Woods Hole Science Center, Woods Hole, MA.

    Online Links:

  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -67.272123
    East_Bounding_Coordinate: -67.234293
    North_Bounding_Coordinate: 18.360995
    South_Bounding_Coordinate: 18.298504
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
    Calendar_Date: 2007
    Currentness_Reference:
    information unavailable from original metadata
  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 (161)
    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 0.000001. Longitudes are given to the nearest 0.000001. 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 1980.
      The semi-major axis of the ellipsoid used is 6378137.000000.
      The flattening of the ellipsoid used is 1/298.257222.
  7. How does the data set describe geographic features?
    st_transects - ***believe this should be lt_transects (V.A. Cross)
    information not available from original metadata (Source: information not available from original metadata)
    FID
    Internal feature number. (Source: ESRI) Sequential unique whole numbers that are automatically generated.
    Shape
    Feature geometry. (Source: ESRI) Coordinates defining the features.
    BaselineID
    Baseline segment from which the transect is generated. (Source: U.S. Geological Survey) information not available from the original metadata
    TransOrder
    Transect feature number in sequential order alongshore. (Source: U.S. Geological Survey) information not available from original metadata
    StartX
    X starting position of the transect in UTM meters. (Source: U.S. Geological Survey) information not available from the original metadata
    StartY
    Y starting position of the transect in UTM meters. (Source: U.S. Geological Survey) information not available from original metadata
    EndX
    X ending position of the transect in UTM meters. (Source: U.S. Geological Survey) information not available from the original metadata
    EndY
    Y ending position of the transect in UTM meters. (Source: U.S. Geological Survey) information not available from the original metadata
    Azimuth
    The transect's horizontal angular distance from north. (Source: U.S. Geological Survey) information not available from the original metadata
    ShorelineD
    Sequential list of shoreline dates that the transect intersects. (Source: U.S. Geological Survey) information not available from original metadata
    PointCNT
    Number of shoreline intersections in the rate calculation. (Source: U.S. Geological Survey) information not available from the original metadata
    WLR
    Weighted Linear Regression (Source: U.S. Geological Survey) information not available from the original metadata
    WR2
    Correlation coefficient (r^2) for weighted linear regression (Source: U.S. Geological Survey) information not available from the original metadata
    WSE
    Standard error of the estimate for weighted linear regression. (Source: U.S. Geological Survey) information not available from the original metadata
    WCI95
    Standard error of the slope at a 95% confidence interval for weighted linear regression (Source: U.S. Geological Survey) information not available from the original metadata

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
    • E.R. Thieler
  2. Who also contributed to the data set?
  3. To whom should users address questions about the data?
    E.R. Thieler
    U.S. Geological Survey
    Research Geologist
    384 Woods Hole Road
    Woods Hole, MA
    USA

    508-548-8700 x2350 (voice)
    508-457-2310 (FAX)
    rthieler@usgs.gov

Why was the data set created?

This dataset is a subset of the resulting output file from the Digital Shoreline Analysis System (DSAS) ArcGIS extension. Transects were cast at 50 meter spacing from Punta Higuero to Punta Cadena. The attribute table associated with this file was populated with values by the DSAS software and reports the long-term rate of change statistic based on the distances between shoreline intersections along each transect.

How was the data set created?

  1. From what previous works were the data drawn?
  2. How were the data generated, processed, and modified?
    Date: unknown (process 1 of 3)
    Transects were generated with a spacing of 50m and saved to a separate feature class using the Digital Shoreline Analysis System (DSAS). The transect-shoreline intersection points were used to compute the statistics that are reported in the newly created transect attribute table. Long-term rates of shoreline change, in units of m/yr, were calculated at each transect using weighted linear regression applied to all shoreline positions from the earliest (1936) to the most recent (2006). Weighted Linear Regression (WLR) was selected because it is a statistically robust quantitative method resulting in a best-fit line that places greater emphasis on data points with a smaller amount of uncertainty. Supplemental statistics for the long-term rates are also reported in units of m/yr and represent a 95% confidence interval for the slope of the regression line. This means with 95% statistical confidence that the true rate of shoreline change falls within the range defined by the reported value plus or minus the error value. The variability around the trend reflects both measurement and sampling errors. Person who carried out this activity:
    E.R. Thieler
    U.S. Geological Survey
    Research Geologist
    384 Woods Hole Road
    Woods Hole, MA
    USA

    508-548-8700 x2350 (voice)
    508-457-2310 (FAX)
    rthieler@usgs.gov
    Date: 18-Oct-2007 (process 2 of 3)
    Data were projected from UTM zone 19 N to geographic. Tool: "ArcGIS > ArcToolbox > Toolboxes > Data Management Tools > Project". Command issued: GEOGCS['GCS_North_American_1983',DATUM['D_North_American_1983',SPHEROID['GRS_1980',6378137.0,298.257222101]],PRIMEM['Greenwich',0.0],UNIT['Degree',0.0174532925199433]] NAD_1983_To_WGS_1984_1 Person who carried out this activity:
    U.S. Geological Survey
    Attn: Emily Himmelstoss
    Geologist
    384 Woods Hole Road
    Woods Hole, MA
    USA

    508-548-8700 x2262 (voice)
    508-457-2310 (FAX)
    ehimmelstoss@usgs.gov
    Date: 19-Aug-2021 (process 3 of 3)
    The metadata was edited to remove errors as well as update some information. Edits include updating the citation section with the DOI link and a slight modification to the dataset title, added the USGS Thesaurus, added keywords section with USGS persistent identifier as theme keyword, replaced distribution liability with FSP statement. Other unrequired blank fields were deleted, duplicate entries within a field were deleted, required empty elements were fixed with “information unavailable from original metadata”. The metadata date (20070222), but not the contact (except email and contact instructions) was updated. The metadata available from a harvester may supersede metadata available from the publication. Compare the metadata dates to determine which metadata file is most recent. The metadata available from a harvester may supersede metadata available from the publication. Compare the metadata dates to determine which metadata file is most recent. Person who carried out this activity:
    U.S. Geological Survey
    Attn: VeeAnn A. Cross
    Marine Geologist
    384 Woods Hole Road
    Woods Hole, MA

    508-548-8700 x2251 (voice)
    508-457-2310 (FAX)
    vatnipp@usgs.gov
  3. What similar or related data should the user be aware of?
    Thieler, E.R., Himmelstoss, E.A., Zichichi, J.L., and Miller, T.L., 2005, Digital Shoreline Analysis System (DSAS) version 3.0: An ArcGIS extension for calculating shoreline change: Open-File Report 2005-1304, U.S. Geological Survey, Coastal and Marine Geology Program, Woods Hole Science Center, Woods Hole, MA.

    Online Links:

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?
  3. How accurate are the heights or depths?
  4. Where are the gaps in the data? What is missing?
    These data are a subset of the Digital Shoreline Analysis System (DSAS) output transect file. The weighted linear regression (WLR) rate and supplemental statistics have been used to quantify long-term shoreline change.
  5. How consistent are the relationships among the observations, including topology?
    No additional checks for topological consistency were performed on the data. No additional checks for topological consistency were performed on the data.

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:
Public domain data are freely redistributable with proper metadata and source attribution. The U.S. Geological Survey (USGS) must be referenced as the originator of the dataset in any future products or research derived from these data.
  1. Who distributes the data set? (Distributor 1 of 1)
    E.R. Thieler
    U.S. Geological Survey
    Research Geologist
    384 Woods Hole Road
    Woods Hole, MA
    USA

    508-548-8700 x2350 (voice)
    508-457-2310 (FAX)
    rthieler@usgs.gov
  2. What's the catalog number I need to order this data set? Downloadable Data
  3. What legal disclaimers am I supposed to read?
    Unless otherwise stated, all data, metadata and related materials are considered to satisfy the quality standards relative to the purpose for which the data were collected. Although these data and associated metadata have been reviewed for accuracy and completeness and approved for release by the U.S. Geological Survey (USGS), no warranty expressed or implied is made regarding the display or utility of the data for other purposes, nor on all computer systems, nor shall the act of distribution constitute any such warranty.
  4. How can I download or order the data?
    • Availability in digital form:
      Data format: The DBF file contains the attribute data in dBASE format. The PRJ file contains the coordinate system information. The SBN and SBX files contain the spatial index of the geospatial data. The SHP file contains the geospatial data. The SHX file contains the index of the geospatial data. The XML file contains the metadata describing the data set. in format SHP (version information not available from original metadata) ESRI Polyline Shapefile Size: 0.014
      Network links: http://pubs.usgs.gov/of/2007/1017/data/shapefiles/lt_transects.zip
      http://pubs.usgs.gov/of/2007/htmldocs/data_catalog.html
      Media you can order: DVD-ROM (Density 4.75 Gbytes) (format UDF)
    • Cost to order the data: None

  5. What hardware or software do I need in order to use the data set?
    These data are available in Environmental Systems Research Institute (ESRI) shapefile format. The user must have ArcGIS or ArcView 3.0 or greater software to read and process the data file. In lieu of ArcView or ArcGIS, the user may utilize another GIS application package capable of importing data. A free data viewer, ArcExplorer, capable of displaying the data is availab efrom ESRI at www.esri.com.

Who wrote the metadata?

Dates:
Last modified: 01-Sep-2021
Metadata author:
Emily Himmelstoss
U.S. Geological Survey
Geologist
384 Woods Hole Road
Woods Hole, MA
USA

508-548-8700 x2262 (voice)
508-457-2310 (FAX)
whsc_data_contact@usgs.gov
Contact_Instructions:
The metadata contact email address is a generic address in the event the metadata contact is no longer with the USGS.
Metadata standard:
FGDC Content Standards for Digital Geospatial Metadata (FGDC-STD-001-1998)
This page is <https://cmgds.marine.usgs.gov/catalog/whcmsc/open_file_report/ofr2007-1017/lt_transects_meta.faq.html>
Generated by mp version 2.9.50 on Tue Sep 21 18:20:22 2021