Ground control point locations for UAS survey of the intertidal zone at West Whidbey Island, WA, 2019-06-04

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Frequently anticipated questions:

What does this data set describe?

Title:
Ground control point locations for UAS survey of the intertidal zone at West Whidbey Island, WA, 2019-06-04
Abstract:
This portion of the data release presents the locations of the temporary ground control points (GCPs) used for the structure-from-motion (SfM) processing of the imagery collected during an unmanned aerial system (UAS) survey of the intertidal zone at West Whidbey Island, WA on 2019-06-04. Twenty-five temporary ground control points (GCPs) were distributed throughout the survey area to establish survey control. The GCPs consisted of a combination of small square tarps with black-and-white cross patterns and "X" marks placed on the ground using temporary chalk. The GCP positions were measured using post-processed kinematic (PPK) GPS, using corrections from a GPS base station located approximately 7 kilometers from the study area. The GCP positions are presented in a comma-delimited text file.
Supplemental_Information:
Additional information about the field activity from which these data were derived is available online at:
https://cmgds.marine.usgs.gov/fan_info.php?fan=2019-623-FA
Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government.
  1. How might this data set be cited?
    Logan, Joshua B., Grossman, Eric E., VanArendonk, Nathan R., and Maverick, Avery F.G., 20210915, Ground control point locations for UAS survey of the intertidal zone at West Whidbey Island, WA, 2019-06-04: data release DOI:10.5066/P9R76MVP, U.S. Geological Survey, Pacific Coastal and Marine Science Center, Santa Cruz, California.

    Online Links:

    This is part of the following larger work.

    Logan, Joshua B., Grossman, Eric E., VanArendonk, Nathan R., and Maverick, Avery F.G., 2021, Aerial imagery and structure-from-motion data products from UAS survey of the intertidal zone at West Whidbey Island, WA, June 2019: data release DOI:10.5066/P9R76MVP, U.S. Geological Survey, Pacific Coastal and Marine Science Center, Santa Cruz, CA.

    Online Links:

  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -122.74734
    East_Bounding_Coordinate: -122.68559
    North_Bounding_Coordinate: 48.27567
    South_Bounding_Coordinate: 48.21731
  3. What does it look like?
    https://www.sciencebase.gov/catalog/file/get/5ef53f0c82ced62aaae6a0c2?name=WestWhidbey_2019-06-04_GCP_browse.jpg&allow=openTrue (JPEG)
    Aerial image showing examples of ground control points used for the UAS survey.
  4. Does the data set describe conditions during a particular time period?
    Calendar_Date: 04-Jun-2019
    Currentness_Reference:
    ground condition at time data were collected
  5. What is the general form of this data set?
    Geospatial_Data_Presentation_Form: comma-delimited text
  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 (26)
    2. What coordinate system is used to represent geographic features?
      Grid_Coordinate_System_Name: Universal Transverse Mercator
      Universal_Transverse_Mercator:
      UTM_Zone_Number: 10
      Transverse_Mercator:
      Scale_Factor_at_Central_Meridian: 0.9996
      Longitude_of_Central_Meridian: -123.0
      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 0.001
      Ordinates (y-coordinates) are specified to the nearest 0.001
      Planar coordinates are specified in meters
      The horizontal datum used is NAD83 (National Spatial Reference System 2011) (EPSG:1116).
      The ellipsoid used is GRS 1980 (EPSG:7019).
      The semi-major axis of the ellipsoid used is 6378137.0.
      The flattening of the ellipsoid used is 1/298.257222101.
      Vertical_Coordinate_System_Definition:
      Altitude_System_Definition:
      Altitude_Datum_Name:
      North American Vertical Datum of 1988 (EPSG:5703), derived using GEOID12B
      Altitude_Resolution: 0.001
      Altitude_Distance_Units: meters
      Altitude_Encoding_Method:
      Explicit elevation coordinate included with horizontal coordinates
  7. How does the data set describe geographic features?
    Attribute Table
    Table containing attribute information associated with the dataset (Source: Producer defined)
    pid
    Point ID (Source: producer defined) A unique identification code for the point.
    northing_utmz10_m
    Northing coordinate of data point relative to the NAD83 (National Spatial Reference System 2011) datum, projected in the Universal Transverse Mercator (UTM) Zone 10 North coordinate system, meters (EPSG:6339) (Source: Producer defined)
    Range of values
    Minimum:5340501.213
    Maximum:5346973.203
    Units:meters
    easting_utmz10_m
    Easting coordinate of data point relative to the NAD83 (National Spatial Reference System 2011) datum, projected in the Universal Transverse Mercator (UTM) Zone 10 North coordinate system, meters (EPSG:6339) (Source: Producer defined)
    Range of values
    Minimum:518750.023
    Maximum:523355.089
    Units:meters
    orthometric_ht_navd88_m
    Orthometric height of data point in meters relative to the North American Vertical Datum of 1988 (EPSG:5703), derived using the National Geodetic Survey GEOID12B. (Source: Producer defined)
    Range of values
    Minimum:-0.579
    Maximum:43.723
    Units:meters
    latitude_dd
    Latitude in decimal degrees, relative to the NAD83 (National Spatial Reference System 2011) datum (EPSG:1116). (Source: Producer defined)
    Range of values
    Minimum:48.21730678
    Maximum:48.27566980
    Units:decimal degrees
    longitude_dd
    Longitude in decimal degrees, relative to the NAD83 (National Spatial Reference System 2011) datum (EPSG:1116). (Source: Producer defined)
    Range of values
    Minimum:-122.74734058
    Maximum:-122.68558738
    Units:decimal degrees
    ellipsoid_ht_m
    Ellipsoid height in meters, referenced to the GRS 1980 ellipsoid (EPSG:7019). (Source: Producer defined)
    Range of values
    Minimum:-22.772
    Maximum:21.308
    Units:meters

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
    • Joshua B. Logan
    • Eric E. Grossman
    • Nathan R. VanArendonk
    • Avery F.G. Maverick
  2. Who also contributed to the data set?
  3. To whom should users address questions about the data?
    U.S. Geological Survey, Pacific Coastal and Marine Science Center
    Attn: PCMSC Science Data Coordinator
    2885 Mission Street
    Santa Cruz, CA

    831-427-4747 (voice)
    pcmsc_data@usgs.gov

Why was the data set created?

These data were collected to characterize the morphology, substrate composition and roughness of intertidal areas to support modeling of coastal storm and wave impacts with sea-level rise as part of the USGS Puget Sound Coastal Storm Modeling System (PS-CoSMoS). The data are also intended to be used to model and evaluate sediment transport and its effects on coastal habitats, a focus of the USGS Coastal Habitats in Puget Sound Project (CHIPS) and its partners to inform resource management and adaptive planning for our Nation's coasts.

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: 2019 (process 1 of 2)
    Ground control was established using ground control points (GCPs) consisting of small square tarps with black-and-white cross patterns and temporary chalk 'X' marks placed on the ground surface throughout the survey area. The GCP positions were measured using survey-grade GPS receivers operating in post-processed-kinematic (PPK) mode. The GPS receivers were placed on short fixed-height tripods and set to occupy each GCP for a minimum occupation time of one minute. The PPK corrections were referenced to a Continuously Operating Reference (CORS) GPS base station ('COUP') located approximately 7 kilometers from the study area operated by the Washington State Reference Network (WSRN). Person who carried out this activity:
    Joshua Logan
    U.S. Geological Survey, Pacific Coastal and Marine Science Center
    2885 Mission Street
    Santa Cruz, CA

    831-460-7519 (voice)
    jlogan@usgs.gov
    Date: 13-Oct-2021 (process 2 of 2)
    Performed minor edits to the metadata to correct typos. No data were changed Person who carried out this activity:
    U.S. Geological Survey
    Attn: Susan A. Cochran
    Geologist
    2885 Mission Street
    Santa Cruz, CA

    831-460-7545 (voice)
    scochran@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?
    No formal attribute accuracy tests were conducted.
  2. How accurate are the geographic locations?
    GCP positions were measured using survey-grade dual-frequency GPS receivers operating in post-processed-kinematic (PPK) mode. The GPS receivers were placed on short fixed-height tripods and set to occupy each GCP for a minimum occupation time of one minute. The PPK corrections were referenced to a Continuously Operating Reference Stations (CORS) operated by the Washington State Reference Network (WSRN) located approximately 7 kilometers from the study area ('COUP'). The mean reported horizontal precision of these measurements was 0.018 meters, (standard deviation of 0.010), suggesting a total horizontal accuracy of about 0.020 meters. This accuracy estimate is valid for all points except point WHD-AUTONOMOUS, for which post-processing failed. The horizontal accuracy for this point is estimated to be about 3.0 meters. Additional uncertainty in the horizontal positions associated with tripod centering, antenna height measurement errors, and errors from the weight of the tripod settling onto the GCP tarp during data collection, and possible subsequent rebound of the center of the tarp after removal is unknown.
  3. How accurate are the heights or depths?
    GCP positions were measured using survey-grade dual-frequency GPS receivers operating in post-processed-kinematic (PPK) mode. The GPS receivers were placed on short fixed-height tripods and set to occupy each GCP for a minimum occupation time of one minute. The PPK corrections were referenced to a Continuously Operating Reference Stations (CORS) operated by the Washington State Reference Network (WSRN) located approximately 7 kilometers from the study area ('COUP'). The mean reported horizontal precision of these measurements was 0.023 meters, (standard deviation of 0.011), suggesting a total vertical accuracy of about 0.030 meters. This accuracy estimate is valid for all points except point WHD-AUTONOMOUS, for which post-processing failed. The vertical accuracy for this point is estimated to be about 6.0 meters. Additional uncertainty in the vertical positions associated with the weight of the tripod settling onto the GCP tarp during data collection, and possible subsequent vertical rebound of the center of the tarp after removal is unknown.
  4. Where are the gaps in the data? What is missing?
    Dataset is considered complete for the information presented, as described in the abstract. Users 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?
    No formal logical accuracy tests were conducted.

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:
USGS-authored or produced data and information are in the public domain from the U.S. Government and are freely redistributable with proper metadata and source attribution. Please recognize and acknowledge the U.S. Geological Survey as the originator(s) of the dataset and in products derived from these data. This information is not intended for navigation purposes.
  1. Who distributes the data set? (Distributor 1 of 1)
    U.S. Geological Survey - ScienceBase
    Denver Federal Center, Building 810, Mail Stop 302
    Denver, CO
    United States

    1-888-275-8747 (voice)
    sciencebase@usgs.gov
  2. What's the catalog number I need to order this data set? The GCP locations are available in a comma-delimited text format.
  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 on any other system or for general or scientific purposes, nor shall the act of distribution constitute any such warranty.
  4. How can I download or order the data?
  5. What hardware or software do I need in order to use the data set?
    The downloadable data file is available in comma-separated values (CSV) spreadsheet format. Text editing software can be used to open the file, as well as spreadsheet programs, such as Microsoft Excel.

Who wrote the metadata?

Dates:
Last modified: 13-Oct-2021
Metadata author:
U.S. Geological Survey, Pacific Coastal and Marine Science Center
Attn: PCMSC Science Data Coordinator
2885 Mission Street
Santa Cruz, CA

831-427-4747 (voice)
pcmsc_data@usgs.gov
Metadata standard:
Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)
This page is <https://cmgds.marine.usgs.gov/catalog/pcmsc/DataReleases/ScienceBase/DR_P9R76MVP/WestWhidbey_2019-06-04_GCP_metadata.faq.html>
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