Lidar-Derived Bare-Earth Digital Elevation Model (DEM) Mosaic for Coastal Topography—Anegada, British Virgin Islands, 2014

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Frequently anticipated questions:

What does this data set describe?

Title:
Lidar-Derived Bare-Earth Digital Elevation Model (DEM) Mosaic for Coastal Topography—Anegada, British Virgin Islands, 2014
Abstract:
A digital elevation model (DEM) mosaic was produced for Anegada, British Virgin Islands, from remotely sensed, geographically referenced elevation measurements collected by Watershed Sciences, Inc. (WSI)/Quantum Spatial using an Optech Orion M300 (1064-nm wavelength) lidar sensor on January 21, 2014.
Supplemental_Information:
According to the contractor, the processed data products are used to aid in the identification of fault patterns and signs of historical seismic activity on the island.
  1. How might this data set be cited?
    Fredericks, Xan, Uri S. ten Brink, Atwater, Brian F., Kranenburg, Christine J., and Nagle, David B., 20160922, Lidar-Derived Bare-Earth Digital Elevation Model (DEM) Mosaic for Coastal Topography—Anegada, British Virgin Islands, 2014: U.S. Geological Survey Data Release doi:10.5066/F7GM85F3, U.S. Geological Survey, St. Petersburg, FL.

    Online Links:

  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -64.41795910
    East_Bounding_Coordinate: -64.26939560
    North_Bounding_Coordinate: 18.75128084
    South_Bounding_Coordinate: 18.68699779
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
    Calendar_Date: 21-Jan-2014
    Currentness_Reference:
    ground condition
  5. What is the general form of this data set?
    Geospatial_Data_Presentation_Form: raster digital data
  6. How does the data set represent geographic features?
    1. How are geographic features stored in the data set?
      Indirect_Spatial_Reference: Tiling Index
      This is a Raster data set. It contains the following raster data types:
      • Dimensions, type Pixel
    2. What coordinate system is used to represent geographic features?
      Grid_Coordinate_System_Name: Universal Transverse Mercator
      Universal_Transverse_Mercator:
      UTM_Zone_Number: 20
      Transverse_Mercator:
      Scale_Factor_at_Central_Meridian: 0.999600
      Longitude_of_Central_Meridian: -63.000000
      Latitude_of_Projection_Origin: 0
      False_Easting: 500000.000000
      False_Northing: 0
      Planar coordinates are encoded using row and column
      Abscissae (x-coordinates) are specified to the nearest 1.00000
      Ordinates (y-coordinates) are specified to the nearest 1.00000
      Planar coordinates are specified in meters
      The horizontal datum used is North American Datum of 1983 (2011).
      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 1/298.25722210100002.
      Vertical_Coordinate_System_Definition:
      Altitude_System_Definition:
      Altitude_Datum_Name: North American Vertical Datum of 1988 (GEOID12A)
      Altitude_Resolution: 0.15
      Altitude_Distance_Units: meters
      Altitude_Encoding_Method:
      Explicit elevation coordinate included with horizontal coordinates
  7. How does the data set describe geographic features?

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
    • Xan Fredericks
    • Uri S. ten Brink
    • Brian F. Atwater
    • Christine J. Kranenburg
    • David B. Nagle
  2. Who also contributed to the data set?
    Acknowledgment of the U.S. Geological Survey, Woods Hole Coastal and Marine Science Center, as a data source would be appreciated in products developed from these data, and such acknowledgment as is standard for citation and legal practices for data source is expected. 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 periods may be inaccurate because of 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?
    Brian Andrews
    U.S. Geological Survey, Woods Hole Coastal and Marine Science Center, St. Petersburg, FL
    Geographer
    384 Woods Hole Rd
    Woods Hole, MA
    USA

    508 457-2348 (voice)
    bandrews@usgs.gov
    Hours_of_Service: M-F, 9:00-5:00 ET

Why was the data set created?

The purpose of this project was to produce a highly detailed and accurate digital elevation map for Anegada, British Virgin Islands for use as a management tool and to make these data available to natural-resource managers and research scientists. These data were collected to fulfill a contract by the U.S. Geological Survey, in collaboration with the Puget Sound LiDAR Consortium.

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: 2014 (process 1 of 4)
    Bare-Earth Raster DEM Creation: Class 2 LiDAR was used to create a 1-meter Bare-Earth Raster DEM, exported as Esri Grid (using ArcMap v. 10.1). Person who carried out this activity:
    Quantum Spatial
    523 Wellington Way
    Lexington, KY
    USA

    859-277-8700 (voice)
    859-277-8901 (FAX)
    Hours_of_Service: Monday through Friday 8:00 AM to 5:00 PM (Eastern Time)
    Data sources produced in this process:
    • Bare-Earth Raster DEMs
    Date: 03-May-2016 (process 2 of 4)
    The provided Esri Grid file was exported as a GeoTIFF, to result in a non-proprietary raster format. Person who carried out this activity:
    Xan Fredericks
    U.S. Geological Survey, St. Petersburg Coastal and Marine Science Center, St. Petersburg, FL
    Cartographer/Lidar Coordinator
    600 4th Street South
    St. Petersburg, FL
    USA

    727 502-8086 (voice)
    afredericks@usgs.gov
    Hours_of_Service: M-F, 8:00-4:00 ET
    Date: 04-Jan-2017 (process 3 of 4)
    Keywords section of metadata optimized for discovery in USGS Coastal and Marine Geology Data Catalog. Person who carried out this activity:
    U.S. Geological Survey
    Attn: Alan O. Allwardt
    Contractor -- Information Specialist
    2885 Mission Street
    Santa Cruz, CA

    831-460-7551 (voice)
    831-427-4748 (FAX)
    aallwardt@usgs.gov
    Date: 13-Oct-2020 (process 4 of 4)
    Added keywords section with USGS persistent identifier as theme keyword. 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?

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?
    WSI/Quantum Spatial reports that the Fundamental Vertical Accuracy (FVA) was computed by comparing the known Real Time Kinematic (RTK) ground control point data collected on open, bare earth surfaces with level slope to the triangulated ground surface generated by the LiDAR points. They report that the root mean square error (RMSE) was computed to be 0.021 m.
  4. Where are the gaps in the data? What is missing?
    WSI/Quantum Spatial reported that the dataset is considered complete for the information presented, as described by the abstract. Useres are advised to read the rest of the metadata record carefully for additional details.
  5. How consistent are the relationships among the observations, including topology?
    WSI/Quantum Spatial reports that data cover the entire area specified for this project. Missing areas are representated by a "NoData" value of -32,767; these areas correspond with lack of bare-earth data within the survey bounds.

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 from the U.S. Government are freely redistributable with proper metadata and source attribution. The U.S. Geological Survey requests to be acknowledged as originator of these data in future products or derivative research.
  1. Who distributes the data set? (Distributor 1 of 1)
    U.S. Geological Survey
    Attn: Brian Andrews
    Geographer
    384 Woods Hole Rd
    Woods Hole, MA
    USA

    508 457-2348 (voice)
    bandrews@usgs.gov
    Hours_of_Service: M-F, 9:00-5:00 ET
  2. What's the catalog number I need to order this data set? ANGD2014_BE_z20_n88g12A_mosaic.tif
  3. What legal disclaimers am I supposed to read?
    Although these data have been processed successfully on a computer system at the U.S. Geological Survey (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 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?
  5. Is there some other way to get the data?
    Contact U.S. Geological Survey for details.

Who wrote the metadata?

Dates:
Last modified: 02-Nov-2020
Metadata author:
Xan Fredericks
U.S. Geological Survey, St. Petersburg Coastal and Marine Science Center, St. Petersburg, FL
Cartographer/Lidar Coordinator
600 4th Street South
St. Petersburg, FL
USA

727 803-8747 (x3086) (voice)
afredericks@usgs.gov
Hours_of_Service: M-F, 8:00-4:00 ET
Metadata standard:
Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)
This page is <https://cmgds.marine.usgs.gov/catalog/spcmsc/ANGD2014_BE_z20_n88g12A_mosaic_metadata.faq.html>
Generated by mp version 2.9.50 on Tue Sep 21 18:18:32 2021