Time Series of Aerial Imagery from Small Unmanned Aircraft Systems and Associated Ground Control Points: Madeira Beach, Florida, July 2017 to June 2018 (Surveyed GCPs)

Frequently anticipated questions:

• What does this data set describe?
  1. How might this data set be cited?
  2. What geographic area does the data set cover?
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
  5. What is the general form of this data set?
  6. How does the data set represent geographic features?
  7. How does the data set describe geographic features?
• Who produced the data set?
  1. Who are the originators of the data set?
  2. Who also contributed to the data set?
  3. To whom should users address questions about the data?
• Why was the data set created?
• How was the data set created?
  1. From what previous works were the data drawn?
  2. How were the data generated, processed, and modified?
  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?
  4. Where are the gaps in the data? What is missing?
  5. How consistent are the relationships among the data, including topology?
• How can someone get a copy of the data set?
  1. Are there legal restrictions on access or use of the data?
  2. Who distributes the data?
  3. What's the catalog number I need to order this data set?
  4. What legal disclaimers am I supposed to read?
  5. How can I download or order the data?
• Who wrote the metadata?

What does this data set describe?

1. How might this data set be cited?
   Brown, Jenna A., Kranenburg, Christine J., and Morgan, Karen L.M., 20200930, Time Series of Aerial Imagery from Small Unmanned Aircraft Systems and Associated Ground Control Points: Madeira Beach, Florida, July 2017 to June 2018 (Surveyed GCPs): U.S. Geological Survey Data Release doi:10.5066/P91TH157, U.S. Geological Survey, St. Petersburg, Florida.

   Online Links:

   • https://doi.org/10.5066/P91TH157

2. What geographic area does the data set cover?

   West_Bounding_Coordinate: -82.79985545
   East_Bounding_Coordinate: -82.79358312
   North_Bounding_Coordinate: 27.79920689
   South_Bounding_Coordinate: 27.79405585
   

3. What does it look like?
4. Does the data set describe conditions during a particular time period?

   Calendar_Date: 12-Jul-2017

   Currentness_Reference:

   ground condition

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
   2. What coordinate system is used to represent geographic features?
      

      Grid_Coordinate_System_Name: Universal Transverse Mercator
      Universal_Transverse_Mercator:

      UTM_Zone_Number: 17N
      Transverse_Mercator:

      Scale_Factor_at_Central_Meridian: 0.9996
      Longitude_of_Central_Meridian: -81
      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 North American Datum of 1983.
      The ellipsoid used is Geodetic Reference System 80.
      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
      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?

   Ground control points (yyyymmdd_GCPs.txt)

   Text file containing position, elevation, and other information related to GCPs collected along with aerial imagery at Madeira Beach, Florida, from July 2017 to June 2018, to produce SfM products in order to observe seasonal and storm-induced changes in beach topography. Points labeled “Control Points” were used in SfM processing, and points labeled “Check Points” can be used for validating the SfM products; it is recommended for SfM processing to use a marker accuracy of 5 cm, horizontal and vertical, for non-groin GCPs, and 10 cm horizontal and 5 cm vertical for groin GCPs. (Source: U.S. Geological Survey)

   Label

   Name label associated with the individual ground control point. (Source: U.S. Geological Survey) The following naming convention prefixes are used to label different types GCPs: R is rooftop; P is parking stripe; SW is sidewalk; x is synthetic point, from lidar data; FDOT is a benchmark; Gn is groin; G is temporary target near groin; B is temporary target on beach; D is temporary target near dune; HOME is the UAS take-off point.

   X/Easting (NAD83, UTM 17N)

   NAD83 (2011), UTM Zone 17N (Source: U.S. Geological Survey)

   Range of values
   Minimum:	322720.786
   Maximum:	323267.600
   Units:	meters

   Y/Northing (NAD83, UTM 17N)

   NAD83 (2011), UTM Zone 17N (Source: U.S. Geological Survey)

   Range of values
   Minimum:	3075723.389
   Maximum:	3076195.345
   Units:	meters

   Z/Altitude (NAVD88, orthometric)

   Orthometric height, NAVD88 (Source: U.S. Geological Survey)

   Range of values
   Minimum:	-0.021
   Maximum:	20.268
   Units:	meters

Who produced the data set?

1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
   • Jenna A. Brown
   • Christine J. Kranenburg
   • Karen L.M. Morgan
2. Who also contributed to the data set?

   Data collection was funded by the U.S. Geological Survey. The authors would like to thank those who contributed to the field data collection, including R.C. Mickey, Dave Thompson, and Justin Birchler.

3. To whom should users address questions about the data?
   Christine J. Kranenburg

   U.S. Geological Survey, St. Petersburg Coastal and Marine Science Center

   600 4th Street South

   St. Petersburg, FL
   

   USA

   727-502-8000 (voice)

   ckranenburg@usgs.gov

Why was the data set created?

Surveyed GCPs were collected along with aerial imagery at Madeira Beach, Florida, from July 2017 to June 2018, to produce SfM products in order to observe seasonal and storm-induced changes in beach topography. Points labeled “Control Points” were used in SfM processing, and points labeled “Check Points” can be used for validating the SfM products; it is recommended for SfM processing to use a marker accuracy of 5 centimeters (cm), horizontal and vertical, for non-groin GCPs, and 10 cm horizontal and 5 cm vertical for groin GCPs.

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: 25-Jun-2018 (process 1 of 2)

   A number of permanent features (for example, parking lot stripes or concrete groin blocks) and temporary targets (black and white, 4-square checked pattern), distributed uniformly throughout the UAS flight operations area, were used as GCPs and were surveyed using a Spectra Precision SP80 GNSS receiver connected to a Continuously Operating Reference Station (CORS) in the Florida Permanent Reference Network (FPRN). Real-time kinematic (RTK) corrections were sampled for 60 seconds and the average positions were recorded, with horizontal position data given in the Universal Transverse Mercator (UTM) projected coordinate system, Zone 17 North (17N), referenced to the North American Datum of 1983 (NAD83), and elevation data referenced to the North American Vertical Datum of 1988 (NAVD88), GEOID12B. The GPS antenna height (2 meters) was entered into the receiver and was accounted for in real time. Person who carried out this activity:
   

   Christine J. Kranenburg

   U.S. Geological Survey, St. Petersburg Coastal and Marine Science Center

   Cartographer

   600 4th Street South

   St. Petersburg, FL
   

   USA

   727-502-8000 (voice)

   ckranenburg@usgs.gov

   Date: 13-Oct-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?
   Brown, J.A., Kranenburg, C.J., and Morgan, K.L.M., 2020, Time Series of Structure-from-Motion Products – Orthomosaics, Digital Elevation Models, and Point Clouds: Madeira Beach, Florida, July 2017 to June 2018: U.S. Geological Survey Data Release doi:10.5066/P9L474WC.

   Online Links:

   • https://doi.org/10.5066/P9L474WC

How reliable are the data; what problems remain in the data set?

1. How well have the observations been checked?
   The accuracy of the data was determined based on repeat surveys of permanent GCPs (for example, parking stripes) and using the maximum standard deviation of the points measured.
2. How accurate are the geographic locations?
   The maximum horizontal standard deviation of all repeatedly surveyed, permanent, GCPs is 3 cm.
3. How accurate are the heights or depths?
   The maximum vertical standard deviation of all repeatedly surveyed, permanent, GCPs is 5.5 cm.
4. Where are the gaps in the data? What is missing?
   This dataset is considered complete for the information presented, as described in the abstract. Users are advised to read the entire metadata record carefully for additional details.
5. How consistent are the relationships among the observations, including topology?
   All data fall within expected ranges.

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 of the dataset and in products derived from these data.

1. Who distributes the data set? (Distributor 1 of 1)
   
   U.S. Geological Survey, St. Petersburg Coastal and Marine Science Center

   Attn: SPCMSC Data Management Group

   600 4th St South

   St. Petersburg, FL
   

   USA

   727-502-8000 (voice)

   gs-g-spcmsc_data_inquiries@usgs.gov
2. What's the catalog number I need to order this data set? These data are available in .txt format, with one file per GCP survey associated with each UAS survey, all contained in a single zipped file.
3. What legal disclaimers am I supposed to read?

   This publication was prepared by an agency of the United States Government. Although these data were processed successfully on a computer system at the U.S. Geological Survey, no warranty expressed or implied is made regarding the display or utility of the data on any other system, nor shall the act of distribution imply any such warranty. The U.S. Geological Survey shall not be held liable for improper or incorrect use of the data described and (or) contained herein. Reference herein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof.

4. How can I download or order the data?
   • Availability in digital form:

     Data format:	The ASCII (.txt) file can be opened with any text editor. in format ASCII
     Network links:	https://coastal.er.usgs.gov/data-release/doi-P91TH157/data/2017-2018_MadeiraBeachFL_GCPs.zip

   • Cost to order the data: None.

Who wrote the metadata?

Dates:

Last modified: 13-Oct-2020

Metadata author:

Christine J. Kranenburg

U.S. Geological Survey, St. Petersburg Coastal and Marine Science Center

Cartographer

600 4th Street South

St. Petersburg, FL

USA

727-502-8000 (voice)

ckranenburg@usgs.gov

Metadata standard:

Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)