Comma separated value (CSV) text file of post-processed kinematic (PPK) data calculated from raw data logged on two Spectra Precision SP80 GNSS receivers during survey 2016-030-FA conducted offshore Sandwich Beach, MA by the U.S. Geological Survey in 2016

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Frequently anticipated questions:


What does this data set describe?

Title:
Comma separated value (CSV) text file of post-processed kinematic (PPK) data calculated from raw data logged on two Spectra Precision SP80 GNSS receivers during survey 2016-030-FA conducted offshore Sandwich Beach, MA by the U.S. Geological Survey in 2016
Abstract:
The objectives of the survey were to provide bathymetric and sidescan sonar data for sediment transport studies and coastal change model development for ongoing studies of nearshore coastal dynamics along Sandwich Town Neck Beach, MA. Data collection equipment used for this investigation are mounted on an unmanned surface vehicle (USV) uniquely adapted from a commercially sold gas-powered kayak and termed the "jetyak". The jetyak design is the result of a collaborative effort between USGS and Woods Hole Oceanographic Institution (WHOI) scientists.
Supplemental_Information:
For more information about the WHCMSC Field Activity, see https://cmgds.marine.usgs.gov/fan_info.php?fan=2016-030-FA.
  1. How might this data set be cited?
    U.S. Geological Survey, 2018, Comma separated value (CSV) text file of post-processed kinematic (PPK) data calculated from raw data logged on two Spectra Precision SP80 GNSS receivers during survey 2016-030-FA conducted offshore Sandwich Beach, MA by the U.S. Geological Survey in 2016: data release DOI:10.5066/P9TJIM2M, U.S. Geological Survey, Coastal and Marine Geology Program, Woods Hole Coastal and Marine Science Center, Woods Hole, Massachusetts.

    Online Links:

    This is part of the following larger work.

    Danforth, W.W., Sherwood, C.R., Martini, M.A., Borden, J., and Brosnahan, S.M., 2018, Sidescan sonar, single beam bathymetry, and navigation collected offshore of Sandwich Beach in 2016, U.S. Geological Field Activity 2016-030-FA: data release DOI:10.5066/P9TJIM2M, U.S. Geological Survey, Reston, VA.

    Online Links:

    Other_Citation_Details:
    Suggested citation: Danforth, W.W. Sherwood, C.R., Martini, M.A., Borden, J., and Brosnahan, S.M., 2018, Sidescan sonar, single beam bathymetry, and navigation collected offshore of Sandwich Beach in 2016, U.S. Geological Field Activity 2016-030-FA: U.S. Geological Survey data release, https://doi.org/10.5066/P9TJIM2M.
  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -70.487544
    East_Bounding_Coordinate: -70.471004
    North_Bounding_Coordinate: 41.774016
    South_Bounding_Coordinate: 41.761633
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
    Beginning_Date: 06-Jun-2016
    Ending_Date: 08-Jun-2016
    Currentness_Reference:
    ground condition during 20160606 - 20160608
  5. What is the general form of this data set?
    Geospatial_Data_Presentation_Form: tabular digital data
  6. How does the data set represent geographic features?
    1. How are geographic features stored in the data set?
      This is a Point data set. It contains the following vector data types (SDTS terminology):
      • Point (492)
    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 0.00000001. Longitudes are given to the nearest 0.00000001. Latitude and longitude values are specified in Decimal Degrees. The horizontal datum used is D_North_American_1983_HARN.
      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_Datum_Name: North American Vertical datum of 1988 (NAVD88)
      Altitude_Resolution: .001
      Altitude_Distance_Units: meters
      Altitude_Encoding_Method:
      Explicit elevation coordinate included with horizontal coordinates
  7. How does the data set describe geographic features?
    Entity_and_Attribute_Overview:
    The first row of the CSV file is a header row, with the remaining rows containing the data.
    The comma separated text files contain the following columns:
    Column 1 - Year: contains the year the data was collected.
    Column 2 - Month: contains the month of the year the data was collected.
    Column 3 - Day: contains the day of the month the data was collected.
    Column 4 - Hour: contains the hour of the day the data was collected.
    Column 5 - Minute: contains the minute of the hour the data was collected.
    Column 6 - Second: contains the second of the minute the data was collected.
    Column 7 - LonDeg: contains double precision post-processed kinematic longitude in decimal degrees.
    Column 8 - LonDeg: contains double precision post-processed kinematic latitude in decimal degrees.
    Column 9 - ortho ht (m): contains the orthomatic height in meters of the SP80 receiver above the NAVD88 datum.
    Entity_and_Attribute_Detail_Citation: U.S. Geological Survey - William Danforth data processor.

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?
  3. To whom should users address questions about the data?
    William W. Danforth
    U. S. Geological Survey
    Geologist
    384 Woods Hole Road
    Woods Hole, Massachusetts
    USA

    508-548-8700 x2274 (voice)
    508-457-2310 (FAX)
    bdanforth@usgs.gov

Why was the data set created?

This text file represents approximately 26 kilometers of navigation and elevation data collected in 2016. These data were collected by the Woods Hole Coastal and Marine Science Center during USGS field activity 2016-030-FA using a Spectra Precision SP80 GNSS receiver (http://www.spectraprecision.com/eng/sp80.html#.WyQWYDNKjUI) that is rigidly mounted on the jetyak. These data can be used in conjunction with other geophysical and sample data to identify sea-floor morphology and sediment texture.

How was the data set created?

  1. From what previous works were the data drawn?
    Raw Navigation Data (source 1 of 1)
    U.S. Geological Survey, Unpublished Material, Raw navigation data.

    Type_of_Source_Media: disc
    Source_Contribution:
    These data were collected using the USGS jetyak, a commercially sold gas-powered kayak built in upstate New York, running pre-planned lines perpendicular to the beach with a 20 meter line spacing. The jetyak has a roto-molded polyethylene hull and an air-cooled 7-horsepower four-stroke engine. It is propelled and steered by means of a water-drive. The boat will run for 8 to 10 hours on 3 gallons of gas at survey speeds of 2 to 6 knots. Modifications were made by USGS and WHOI scientists to make the jetyak autonomous. The two original manual controls (throttle and steering) are replaced by servos: automatic devices that use error-sensing feedback to correct performance, such as those employed in remote-control airplanes and satellite-tracking antennas. The servos are run by an onboard computer developed for aerial drones. This computer, a modified Arduino, includes Ardupilot software and a special circuit board that provides interfaces for the controls, radio, and Global Positioning System receiver (GPS). The only other modification is installation of a centrifugal clutch, which allows the engine to idle without moving the jetyak.
    Onboard the Jetyak is a hull mounted Humminbird 898c HD SI Combo GPS Fish Finder that is used for GPS navigation and location in addition to collection of sidescan sonar data at 455 kHz, and depth (bathymetric) data at 83 and 200 kHz. Files are saved in a proprietary Humminbird .SON/.DAT paired data format, contact www.humminbird.com for details. A separate navigation GPS receiver mounted onboard the Jetyak is a Spectra Precision SP80 GNSS receiver (http://www.spectraprecision.com/eng/sp80.html#.WyQWYDNKjUI). This receiver is mounted on top of a pole 1.025 meters in length which is attached to the hull of the jetyak. This receiver is called the "rover", and saves information that will later be used in conjunction with base station established on the beach to calculate kinematic solutions for both the horizontal and vertical coordinates of the rover. The sidescan sonar, navigation, and bathymetry data were processed using Chesapeake Technology 64-bit SonarWiz6 version 6.05.0025 (www.chesapeaketech.com) and ArcGIS version 10.5 (www.esri.com).
  2. How were the data generated, processed, and modified?
    Date: 21-May-2018 (process 1 of 2)
    Post-Processing kinematic (PPK) procedure:
    1. Horizontal coordinates and ellipsoidal heights were recorded using a Spectra Precision SP80 GNSS Receiver mounted onboard the Jetyak, called a rover station.
    2. Horizontal coordinates and ellipsoidal heights were also recorded at base station situated on Sandwich Beach using a Spectra Precision SP80 GNSS Single Receiver.
    3. The recorded data from the base and rover stations were imported into the Novatel GrafNav GNSS Post-Processing Software. Standard kinematic processing procedures using the software transformed the rover horizontal coordinates into the NAD83 HARN geographic reference frame, and transformed the rover recorded GPS ellipsoidal heights into orthometric heights referenced to NAVD88, the results of which were saved to a comma separated value (CSV) text file (2016-030-FA_orthometric.csv) which contains the calculated horizontal and vertical positions every 30 seconds. Person who carried out this activity:
    William W. Danforth
    U.S. Geological Survey
    Geologist
    384 Woods Hole Road
    Woods Hole, MA
    USA

    508-548-8700 x2274 (voice)
    508-457-2310 (FAX)
    bdanforth@usgs.gov
    Date: 08-Sep-2020 (process 2 of 2)
    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?
    Calculated kinematic horizontal positions have an accuracy of +/- 30 centimeters.
  3. How accurate are the heights or depths?
    Vertical accuracy of the calculated vertical elevation above datum is +/- 5 centimeters.
  4. Where are the gaps in the data? What is missing?
    All collected survey line navigation data.
  5. How consistent are the relationships among the observations, including topology?
    This text file contains post-processed kinematic (PPK) navigation and elevation data collected by the Woods Hole Coastal and Marine Science Center during USGS field activity 2016-030-FA using two Spectra Precision SP80 GNSS receivers, one of which is located on the jetyak, and one that is situated on a base station located on Sandwich Beach, MA.

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:
Not to be used for navigation. Public domain data from the U.S. Government are freely redistributable with proper metadata and source attribution. Please recognize the U.S. Geological Survey as the originator of the dataset.
  1. Who distributes the data set? (Distributor 1 of 1)
    William W. Danforth
    U.S. Geological Survey
    Geologist
    384 Woods Hole Road
    Woods Hole, Massachusetts
    USA

    508-548-8700 x2274 (voice)
    508-457-2310 (FAX)
    bdanforth@usgs.gov
  2. What's the catalog number I need to order this data set? Windows 10 zip file 2016-030-FA_orthometric.zip containing point post-processed kinematic navigation and elevation data stored in a comma separated value text file (2016-030-FA_orthometric.csv), as well as FGDC CSDGM metadata files (2016-030-FA_orthometric.xml, 2016-030-FA_orthometric.html, 2016-030-FA_orthometric.txt). No browse graphic is available.
  3. What legal disclaimers am I supposed to read?
    Neither the U.S. Government, the Department of the Interior, nor the USGS, nor any of their employees, contractors, or subcontractors, make any warranty, express or implied, nor assume any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, nor represent that its use would not infringe on privately owned rights. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the USGS in the use of these data or related materials. Any use of trade, product, or firm 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?
    none
  6. What hardware or software do I need in order to use the data set?
    These data are available as text distributed in a comma separated value text format. The CSV file is stored in one folder 'orthometric' that has been compressed using native Windows 10 compression software. To utilize these data, the user must have software capable of uncompressing the zip file. The zip file also contains associated metadata.

Who wrote the metadata?

Dates:
Last modified: 08-Sep-2020
Metadata author:
William W. Danforth
U.S. Geological Survey
Geologist
384 Woods Hole Road
Woods Hole, Massachusetts
USA

508-548-8700 x2274 (voice)
508-457-2310 (FAX)
bdanforth@usgs.gov
Metadata standard:
FGDC Content Standards for Digital Geospatial Metadata (FGDC-STD-001-1998)

This page is <https://cmgds.marine.usgs.gov/catalog/whcmsc/field_activities/2016_030_fa/2016-030-FA_orthometric.faq.html>
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