Baseline coastal oblique aerial photographs collected at the Chandeleur Islands, Louisiana, and Dauphin Island, Alabama, July 24, 2010

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Frequently anticipated questions:


What does this data set describe?

Title:
Baseline coastal oblique aerial photographs collected at the Chandeleur Islands, Louisiana, and Dauphin Island, Alabama, July 24, 2010
Abstract:
The U.S. Geological Survey (USGS) conducts baseline and storm-response photography missions to document and understand the changes in the vulnerability of the Nation's coasts to extreme storms. On July 24, 2010, the USGS conducted an oblique aerial photographic survey at the Chandeleur Islands, Louisiana, and Dauphin Island, Alabama, aboard a Beechcraft BE90 King Air aircraft at an altitude of 500 feet (ft) and approximately 1,200 ft offshore. This mission was conducted to collect data for assessing incremental changes in the beach and nearshore area and can be used to assess future coastal change. The photographs provided are Joint Photographic Experts Group (JPEG) images. The photograph locations are an estimate of the aircraft's position and do not indicate the location of the features in the images. These photographs document the configuration of the barrier islands and other coastal features at the time of the survey. ExifTool (version 4.0) was used to add the following to the header of each photograph: time of collection, GPS latitude, GPS longitude, keywords, credit, artist (photographer), caption, copyright, and contact information. Photographs can be opened with any JPEG-compatible image viewer by clicking on a thumbnail on the contact sheet. All image times are recorded in Coordinated Universal Time (UTC).
Supplemental_Information:
For a summary of field activity 10CCH01 please see https://cmgds.marine.usgs.gov/fan_info.php?fan=10CCH01. Bounding coordinates for the oblique aerial survey are derived from the overall flight path found in the GPS data. Ancillary files included in this publication are: 10CCH01-LocationMaps.zip, 10CCH01-ProcessedNav.zip, 10CCH01-SupplementalFiles.zip, and 10CCH01-RawGPSNav.zip; in addition to the digital oblique aerial image zip files.
  1. How might this data set be cited?
    Morgan, Karen L.M., and Long, Joseph W., 20171113, Baseline coastal oblique aerial photographs collected at the Chandeleur Islands, Louisiana, and Dauphin Island, Alabama, July 24, 2010: U.S. Geological Survey Data Release doi:10.5066/F7HH6H6M, U.S. Geological Survey, St. Petersburg, FL.

    Online Links:

  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -88.907440
    East_Bounding_Coordinate: -88.066403
    North_Bounding_Coordinate: 30.710323
    South_Bounding_Coordinate: 29.727282
  3. What does it look like?
    https://coastal.er.usgs.gov/data-release/doi-F7HH6H6M/data/10CCH01-LocationMaps.zip (10CCH01-Survey-Map.jpg) (JPEG)
    Map of survey area during USGS field activity 10CCH01.
    https://coastal.er.usgs.gov/data-release/doi-F7HH6H6M/data/10CCH01-LocationMaps.zip (JPEG)
    Maps showing the extent of each area and 5-minute segment can be found in the 10CCH01-LocationMaps.zip file. The maps in this survey are: 10CCH01-Map-Area01.jpg, Area 1 at the Chandeleur Islands, Louisiana, First Pass; 10CCH01-Map-Area02.jpg, Area 2 at the Chandeleur Islands, Louisiana, Second Pass; 10CCH01-Map-Area03.jpg, Area 3 at the Chandeleur Islands, Louisiana, Third Pass; 10CCH01-Map-Area04.jpg, Area 4 at Dauphin Island, Alabama, First Pass; 10CCH01-Map-Area05.jpg, Area 5 at Dauphin Island, Alabama, Second Pass. Two inset maps are also included: Inset01_Northernend.jpg and 10CCH01-Map-Inset02_Northbenchmark.jpg. The flight path, divided into 5-minute segments, is represented by the alternating purple and yellow lines.
  4. Does the data set describe conditions during a particular time period?
    Beginning_Date: 24-Jul-2010
    Beginning_Time: 130603
    Ending_Date: 24-Jul-2010
    Ending_Time: 220924
    Currentness_Reference:
    ground condition
  5. What is the general form of this data set?
    Geospatial_Data_Presentation_Form: Raster and 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 Vector data set. It contains the following vector data types (SDTS terminology):
      • Point (1293)
    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 0.0197878497. Longitudes are given to the nearest 0.0227728255. Latitude and longitude values are specified in Decimal Degrees. The horizontal datum used is North American Datum of 1983.
      The ellipsoid used is GRS 1980.
      The semi-major axis of the ellipsoid used is 6378137.0.
      The flattening of the ellipsoid used is 1/298.257222101.
  7. How does the data set describe geographic features?
    10CCH01-Flightpath.csv, 10CCH01-Photolocation.csv
    The "*Flightpath.csv" files contain the processed GPS information collected during the flight, while the "*Photolocations.csv" file contains a latitude position, longitude position, time, and image name for each image. (Source: USGS)
    PHOTO_ID
    Photograph identification number, using the filename format yyyy_mmdd_hhmmssd.jpg or yyyy_mmdd_hhmmssd3.jpg (Source: USGS) Oblique Images
    URL
    Path to low resolution version of the image. (Source: USGS) URL path defining the features.
    ZIPFILENAME
    Name of zip file containing the image. (Source: USGS) Zipfile name.
    LONGITUDE
    Longitude of photograph location, in decimal degrees (NAD83). (Source: USGS) Coordinates defining the features.
    LATITUDE
    Latitude of photograph location, in decimal degrees (NAD83). (Source: USGS) Coordinates defining the features.
    DATE_FLOWN
    Date image was captured, in yyyymmdd_hhmmss format. (Source: USGS) Date defining the features.
    TIME_UTC
    Time photograph was collected, in xxhxxmxxs format. Times were recorded in Coordinated Universal Time (UTC), where "xx" is the number and "h" is hours, "m" is minutes, and "s" is seconds at the time of capture. (Source: USGS) Time defining the features.
    GEO_AREA
    The geographic area of the mission. (Source: USGS) States or regions partially covered in the oblique photographic mission.
    STATES
    The states included in the survey area of the mission. (Source: USGS) States or regions partially covered in the oblique photographic mission.
    SURVEY
    USGS mission tracking number; also known as a field activity number. (Source: USGS) Mission number utilized by the USGS Coastal and Marine Geology program’s data catalog, Compass, to track survey details and associated data.
    PRE_POST
    Identifies the flight as being pre-storm or post-storm. Baseline or Post-Storm status. (Source: USGS)
    ValueDefinition
    PreFlight was prior to a storm.
    PostFlight was after a storm.
    STORM
    If the flight was conducted due to a storm, the name of the storm is listed. Name of Storm (or Baseline). (Source: USGS) The storm name is listed, if the flight was conducted pre- or post-storm, otherwise "Baseline" is entered.
    Entity_and_Attribute_Overview:
    Navigation files: The flight line navigation files are 10CCH01-Flightpath.csv, the photo locations are in 10CCH01-Photolocations.csv, and are contained within the 10CCH01-ProcessedNav.zip file. Tthe Raw GPS is in 10CCH01-RawGPSNav.txt, which is contained within the 10CCH01-RawGPSNav.zip file. These zip files can be found in the data download table. The files (.csv and .txt) are comma-delimited CSV text files.
    Entity_and_Attribute_Overview:
    Graphic Image Files: The index map is a JPEG image. The index map shows the baseline coastal oblique aerial photographs collected at the Chandeleur Islands, Louisiana, and Dauphin Island, Alabama, on July 24, 2010. The index map also shows five areas, which link to more detailed maps and indicate how the full-size photographs are divided into each area.
    Entity_and_Attribute_Overview: Navigation files: These files (*.csv) are comma-delimited.
    Entity_and_Attribute_Detail_Citation: none

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
    • Karen L.M. Morgan
    • Joseph W. Long
  2. Who also contributed to the data set?
    Funding and support for this study were provided by the USGS Coastal and Marine Geology Program (CMGP). #The authors wish to thank pilot Mitch Bobowski for his assistance with data collection. This report benefited from the comments and review of Justin Birchler with the USGS St. Petersburg Coastal and Marine Science Center (SPCMSC), St. Petersburg, FL.
  3. To whom should users address questions about the data?
    Karen L.M. Morgan
    USGS
    Geologist
    600 4th Street South
    St. Petersburg, FL
    USA

    (727) 502-8037 (voice)
    kmorgan@usgs.gov

Why was the data set created?

To provide access to digital photographs taken as part of the July 24, 2010, baseline oblique aerial survey collected along the coast at the Chandeleur Islands, Louisiana, and Dauphin Island, Alabama, and to provide access to attribute data that documents the time and location where each photograph was taken.

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: 24-Jul-2010 (process 1 of 6)
    The still photography was shot out of the rear window of the aircraft. Person who carried out this activity:
    Karen L.M. Morgan
    USGS
    Geologist
    600 4th Street South
    St. Petersburg, FL
    USA

    727-502-8037 (voice)
    kmorgan@usgs.gov
    Date: 30-Jul-2010 (process 2 of 6)
    Image Processing: Images were converted to JPEG format using Nikon Capture Camera Editor Ver 4.4.2. Images in JPEG format were saved using the filename format yyyy_mmdd_hhmmssd.jpg (where the "d" signifies acquisition using the digital camera, and the "d3" signifies digital acquisition using the Nikon Coolpix). The names provide information about the photograph's year, month, day, hour, minute, and second. For example, image 2010_0724_133636d.jpg was taken July 24, 2010, at 13:36:36 UTC. Best attempts were made to set the camera's internal clock to within 1 second of UTC at the beginning of the flight. Person who carried out this activity:
    Karen L.M. Morgan
    USGS
    Geologist
    600 4th Street South
    St. Petersburg, FL
    USA

    727-502-8037 (voice)
    kmorgan@usgs.gov
    Date: 30-Jul-2010 (process 3 of 6)
    Navigation processing: Using a custom Practical Extraction and Reporting Language (Perl) script written by Karen Morgan, USGS, GPS data and image files were used to generate CSV file containing latitude, longitude, and time record for each image. Person who carried out this activity:
    Karen L.M. Morgan
    USGS
    Geologist
    600 4th Street South
    St. Petersburg, FL
    USA

    727-502-8037 (voice)
    kmorgan@usgs.gov
    Date: 20-Oct-2017 (process 4 of 6)
    Survey map creation: The survey maps provided in this archive were created with Environmental Systems Research Institute (Esri) ArcGIS 10.3 software and saved as Adobe Illustrator (*.ai) files. Survey maps were edited using Adobe Illustrator CC and exported in JPEG format. Person who carried out this activity:
    Karen L.M. Morgan
    USGS
    Geologist
    600 4th Street South
    St. Petersburg, FL
    USA

    727-502-8037 (voice)
    kmorgan@usgs.gov
    Date: 20-Oct-2017 (process 5 of 6)
    The imagery in this release was divided into manageable sized (<200MB) zip files for ease of download and review. Subareas may be designed within those areas to conform to zip file size requirements for downloading. Person who carried out this activity:
    Karen L.M. Morgan
    USGS
    Geologist
    600 4th Street South
    St. Petersburg, FL
    USA

    727-502-8037 (voice)
    kmorgan@usgs.gov
    Date: 30-Jul-2010 (process 6 of 6)
    EXIF headers: Exchangeable Image File (EXIF) and International Press Telecommunications Council (IPTC) headers were populated from the command prompt using ExifTool (http://www.sno.phy.queensu.ca/~phil/exiftool, 2017) as part of the post flight processing using a Perl script written by Karen Morgan, USGS, St. Petersburg, FL. ExifTool added the following data to the EXIFHeader: time of collection, GPS latitude, GPS longitude, keywords, credit, artist (photographer), caption, copyright, and contact information. Person who carried out this activity:
    Karen L.M. Morgan
    USGS
    Geologist
    600 4th Street South
    St. Petersburg, FL
    USA

    727-502-8037 (voice)
    kmorgan@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?
    Best attempts were made to set the cameras to UTC time on the GPS receivers at the beginning of each flight. The clock of the Compix Titler unit was also set to UTC at the same time. Human error during transcription of geographic position and time from the video is possible; however, no obvious errors were observed. Latitude, longitude, and time were collected at an interval of approximately once per second. Note: Latitude and longitude positions in this report refer to the position of the aircraft, not the position of the landmarks photographed. Refer to the Process Steps below for more detail.
  2. How accurate are the geographic locations?
    An attempt was made to keep the same relative distance between the aircraft and the beach in order to maintain a constant field of view.
  3. How accurate are the heights or depths?
  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 section. 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?
    Data presented here include the digitally collected photographs in JPEG format with the Exchangeable Image File (EXIF) header embedded with the individual photograph's location along the flight path of the baseline coastal oblique aerial photographic survey of the coast, taken at the Chandeleur Islands, Louisiana, and Dauphin Island, Alabama. This mission was flown on July 24, 2010, aboard a Beechcraft BE90 King Air aircraft, tail number N155LS. Crew members of the USGS in St. Petersburg, FL, included Karen L.M. Morgan, M. Dennis Krohn, Ann Marie Ascough, and Joseph W. Long, and pilot Mitch Bobowski of Bay Air Charters, Inc. Still photography was collected along the coast during this survey. GPS Data Collection—Instrument: Garmin GPS 18 PC, WAAS Enabled. Data Collection Interval: 1 Second. Data File Format: Native Fugawi and Text; Number of files created: 2. Computer/Software: Computer: Panasonic Toughbook CF-51. Software: Fugawi Marine ENC, Ver. 4 GPS Navigation Software. The GPS unit was used to record navigation fixes of the aircraft, not the position of the features imaged.

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 as the originator of the dataset.
  1. Who distributes the data set? (Distributor 1 of 1)
    Karen L.M. Morgan
    USGS
    Geologist
    600 4th Street South
    St. Petersburg, FL
    USA

    727-502-8037 (voice)
    kmorgan@usgs.gov
  2. What's the catalog number I need to order this data set?
  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: CSV: Comma-separated values files representing table information collected during the flight. JPEG: Images can be opened directly with any JPEG-compatible image viewer. TXT: Metadata and navigation files. XML: Extensible Markup Language formatted metadata files. in format CSV, JPEG, TXT, XML
      Network links: https://coastal.er.usgs.gov/data-release/doi-F7HH6H6M/
    • Cost to order the data: None.


Who wrote the metadata?

Dates:
Last modified: 24-Apr-2019
Metadata author:
Karen L.M. Morgan
USGS
Geologist
600 4th Street South
St. Petersburg, FL
USA

727-502-8037 (voice)
kmorgan@usgs.gov
Metadata standard:
Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)

This page is <https://cmgds.marine.usgs.gov/catalog/spcmsc/10CCH01-Metadata.faq.html>
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