Listing of File Names and Positions of Images Collected During Unmanned Aerial Systems Flights Over Town Neck Beach, in Sandwich, Massachusetts on January 9, January 25, February 14, March 16, April 28, May 4, and September 18, 2017

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Frequently anticipated questions:


What does this data set describe?

Title:
Listing of File Names and Positions of Images Collected During Unmanned Aerial Systems Flights Over Town Neck Beach, in Sandwich, Massachusetts on January 9, January 25, February 14, March 16, April 28, May 4, and September 18, 2017
Abstract:
Low-altitude (80-100 meters above ground level) digital images of Town Neck Beach in Sandwich, Massachusetts were obtained with a camera mounted on a small unmanned aerial system (UAS; also known as a drone). Imagery was collected at close to low tide on seven days to observe changes in beach and dune morphology. The images were geolocated by using the single-frequency geographic positioning system aboard the UAS. Ground control points (GCPs) were established by using temporary targets on the ground, which were located by using a real-time kinematic global navigation satellite system (RTK-GNSS) base station and rovers. The GCPs can be used as constraints during photogrammetric processing. Transect points were collected by using the same RTK-GNSS system; these can used to evaluate photogrammetric products. This data release includes georeferenced images, image-location files, GCPs, and transect points. Collection of these data was supported by the USGS Coastal and Marine Geology Program and were conducted under USGS field activity numbers 2017-005-FA, 2017-008-FA, 2017-010-FA, 2017-014-FA, 2017-027-FA, 2017-029-FA, and 2017-050-FA.
Supplemental_Information:
For more information about the field activity, see https://cmgds.marine.usgs.gov/fan_info.php?fan=2017-005-FA, https://cmgds.marine.usgs.gov/fan_info.php?fan=2017-008-FA, https://cmgds.marine.usgs.gov/fan_info.php?fan=2017-010-FA, https://cmgds.marine.usgs.gov/fan_info.php?fan=2017-014-FA, https://cmgds.marine.usgs.gov/fan_info.php?fan=2017-027-FA, https://cmgds.marine.usgs.gov/fan_info.php?fan=2017-029-FA, https://cmgds.marine.usgs.gov/fan_info.php?fan=2017-050-FA. Drone mapping was conducted at Town Neck Beach in Sandwich, Massachusetts between 2015 and the present (November 2017). The digital images, Ground Control Points and transect data from a calendar year are released together. This product contains the data collected in 2017.
  1. How might this data set be cited?
    U.S. Geological Survey, 2019, Listing of File Names and Positions of Images Collected During Unmanned Aerial Systems Flights Over Town Neck Beach, in Sandwich, Massachusetts on January 9, January 25, February 14, March 16, April 28, May 4, and September 18, 2017: data release DOI:10.5066/F7QC02RM, U.S. Geological Survey, Coastal and Marine Geology Program, Woods Hole Coastal and Marine Science Center, Woods Hole, MA.

    Online Links:

    This is part of the following larger work.

    Sherwood, C., Traykovski, P., Montgomery, E., Borden, J., Brosnahan, S., Irwin, B., Marsjanik, E., Martini, M., and Suttles, S., 2019, Geotagged Low-Altitude Aerial Imagery, From Unmanned Aerial Systems Flights Over Town Neck Beach, in Sandwich, Massachusetts, With Associated Ground Control Points, and Transects Collected on January 9, January 25, February 14, March 16, April 28, May 4, and September 18, 2017: data release DOI:10.5066/F7QC02RM, U.S. Geological Survey, Reston, VA.

    Online Links:

    Other_Citation_Details:
    Suggested citation: Sherwood, C.R., Traykovski, P.A., Montgomery, E.T., Borden, J., Brosnahan S.M., Irwin, B.J., Marsjanik, E.D., Martini, M.A., and Suttles, S.E., 2019, Geotagged low-altitude aerial imagery from unmanned aerial systems flights over Town Neck Beach in Sandwich, Massachusetts, with associated ground control points and transects, collected on January 9, January 25, February 14, March 16, April 28, May 4, and September 18, 2017: U.S. Geological Survey data release, https://doi.org/10.5066/F7QC02RM.
  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -70.4886
    East_Bounding_Coordinate: -70.4519
    North_Bounding_Coordinate: 41.7715
    South_Bounding_Coordinate: 41.7549
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
    Calendar_Date: 09-Jan-2017
    Currentness_Reference:
    ground condition
  5. What is the general form of this data set?
    Geospatial_Data_Presentation_Form: digital text files
  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
    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 D_WGS_1984.
      The ellipsoid used is WGS_1984.
      The semi-major axis of the ellipsoid used is 6378137.000000.
      The flattening of the ellipsoid used is 1/298.257224.
      Vertical_Coordinate_System_Definition:
      Altitude_System_Definition:
      Altitude_Datum_Name: mean sea level
      Altitude_Resolution: 1
      Altitude_Distance_Units: meters
      Altitude_Encoding_Method:
      Explicit elevation coordinate included with horizontal coordinates
  7. How does the data set describe geographic features?
    2017SandwichTNB_image_locations.zip
    There is one list file for each zip file of images from Town Neck Beach, Sandwich, MA (available from the larger work citation) for 2017. Each list file contains 4 columns: file name, latitude, longitude, and altitude. (Source: U.S. Geological Survey)
    file name
    Name with extension of the image file in the form nnnnnnnFA__UnnnCCCC_yyyymmddThhmmssZ_fffffff.JPG, where nnnnnnnFA is the Woods Hole Coastal and Marine Science Center field activity number; UnnnCCCC is the flight number and camera number specific to the survey; yyyymmddThhmmssZ is the date and time of the image (UTC) in format year, month, day, "T", hours, minutes, seconds, "Z"; and ffffffff is the original file name. (Source: U.S. Geological Survey) character set
    latitude (decimal degrees)
    Latitude recorded by UAS navigation (Source: DJI Phantom or 3DR Solo UAS GPS navigation system)
    Range of values
    Minimum:41.75
    Maximum:41.78
    Units:signed decimal degrees
    Resolution:1.0E-4
    longitude (decimal degrees)
    Longitude recorded by UAS navigation (Source: DJI Phantom or 3DR Solo UAS GPS navigation system)
    Range of values
    Minimum:-70.45
    Maximum:-70.50
    Units:signed decimal degrees
    Resolution:1.0E-4
    altitude (meters)
    Altitude of camera in approximate meters above mean sea level. (Source: DJI Phantom or 3DR Solo UAS GPS navigation system)
    Range of values
    Minimum:1
    Maximum:400
    Units:meters
    Resolution:1.0E-3
    Entity_and_Attribute_Overview:
    24 text files are in the .zip; each contains the file names of images in a .zip file with their locations and elevations. Each file contains one header line, followed by lines with 4 columns of comma-separated values. The header line describes the column contents, as follows: file name, latitude (decimal degrees), longitude (decimal degrees), altitude (meters). Subsequent lines contain the file names and locations at which the image was taken based on the GPS position from the UAS. The listing file names match the first fourteen characters of the name of the zipped images. When there is more than one zip file of images on a day the additional '_f1', '_f2', is appended to the list file name. Each file has a different number of data records corresponding to the number of images in each .zip file; the number of lines (below) includes the header line: 2017005FA_U020_image_locations.csv has 1042 lines; 2017008FA_U021nadir_image_locations.csv has 910 lines; 2017008FA_U021oblique_image_locations.csv has 50 lines; 2017010FA_U022nadir_image_locations.csv has 1017 lines; 2017010FA_U022oblique_image_locations.csv has 49 lines; 2017014FA_U024_image_locations.csv has 476 lines; 2017027FA_U029_image_locations.csv has 895 lines; 2017029FA_U031_f1_image_locations.csv has 441 lines; 2017029FA_U031_f3_image_locations.csv has 358 lines; 2017029FA_U031_f4_image_locations.csv has 392 lines; 2017029FA_U031_f5_image_locations.csv has 279 lines; 2017029FA_U031_f6_image_locations.csv has 343 lines; 2017029FA_U031_f7_image_locations.csv has 464 lines; 2017029FA_U031_f8_image_locations.csv has 347 lines; 2017050FA_U039_f1_image_locations.csv has 366 lines; 2017050FA_U039_f2_image_locations.csv has 188 lines; 2017050FA_U039_f3_image_locations.csv has 357 lines; 2017050FA_U039_f4_image_locations.csv has 241 lines; 2017050FA_U039_f6_image_locations.csv has 275 lines; 2017050FA_U039_f7_image_locations.csv has 373 lines 2017050FA_U039_f8_image_locations.csv has 393 lines; 2017050FA_U039_f9_image_locations.csv has 262 lines; 2017050FA_U039_f10_image_locations.csv has 383 lines; 2017050FA_U039_f11_image_locations.csv has 257 lines.
    Entity_and_Attribute_Detail_Citation:
    USGS Field Activities 2017-005-FA, 2017-008-FA, 2017-010-FA, 2017-014-FA, 2017-027-FA, 2017-029-FA, 2017-050-FA

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?
    Sandra Brosnahan
    U.S. Geological Survey
    384 Woods Hole Road
    Woods Hole, MA

    508-548-8700 x2265 (voice)
    sbrosnahan@usgs.gov

Why was the data set created?

This dataset consists of lists of image filenames with their corresponding locations. This enables users to plot image locations without having to extract the information from the image headers.

How was the data set created?

  1. From what previous works were the data drawn?
    Image file locations data from USGS field activities 2017-005-FA, 2017-008-FA, 2017-010-FA, 2017-014-FA, 2017-027-FA, 2017-029-FA, 2017-050-FA (source 1 of 1)
    Type_of_Source_Media: .csv file
    Source_Contribution:
    One list of file names and locations was generated for each zipped file of aerial images. There may be one or several zip files of images for each day at Town Neck Beach, Sandwich, MA.
  2. How were the data generated, processed, and modified?
    Date: 28-Dec-2017 (process 1 of 1)
    The location fields were extracted from the EXIF header in each image file and written to a .csv file using a Python script. Person who carried out this activity:
    Sandy Brosnahan
    U.S. Geological Survey
    Physical Scientist
    384 Woods Hole Rd.
    Woods Hole, MA

    508-548-8700 x2265 (voice)
    508-457-2310 (FAX)
    sbrosnahan@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?
    The location information from the UAS navigation system was extracted from the EXIF headers in the geotagged images and saved in a plain-text comma-separated-value (.csv) file for easier reference.
  2. How accurate are the geographic locations?
    Horizontal coordinates (decimal degrees WGS84) recorded by the single-frequency GPS on the DJI Phantom 3 and Phantom 4 UAS were written to the EXIF header portions of the images during flight. For the other UAS, horizontal positions determined by the GPS were recorded in flight logs and transcribed to the EXIF headers during post-flight processing (geotagging). Horizontal locations are considered accurate to approximately 3 meters, but may be off by as much as 10 meters.
  3. How accurate are the heights or depths?
    Vertical coordinates (meters above sea level) recorded by the single-frequency GPS on the DJI Phantom 3 and Phantom 4 UAS (flghts before May 4) were written to the EXIF header portions of the images during flight. For the other UAS, vertical positions determined by the GPS were recorded in flight logs and transcribed to the EXIF headers during post-flight processing (geotagging). The altitude measurements are accurate to approximately +/- 10 m, but uncorrected offsets in the take-off altitude may introduce biases of as much as 50 meters.
  4. Where are the gaps in the data? What is missing?
    These files contain a record for every image distributed as part of the larger work citation.
  5. How consistent are the relationships among the observations, including topology?
    There is a file for each field activity of surveying. Positions in the file have horizontal coordinates in decimal latitude (WGS84, positive north), decimal longitude (WGS84, positive east), and altitude (meters above sea level). The altitude information is susceptible to uncorrected offsets in the take-off altitude and may be biased by as much as 50 meters.

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. Please recognize the U.S. Geological Survey (USGS) as the source of this information.
  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

    1-888-275-8747 (voice)
    sciencebase@usgs.gov
  2. What's the catalog number I need to order this data set?
  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 U.S. Geological Survey 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?

Who wrote the metadata?

Dates:
Last modified: 19-Dec-2018
Metadata author:
Ellyn Montgomery
U.S. Geological Survey
Oceanographer
384 Woods Hole Rd.
Woods Hole, MA

508-548-8700 x2356 (voice)
508-457-2310 (FAX)
emontgomery@usgs.gov
Metadata standard:
Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)

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