Spatially referenced oblique aerial photography of the Golovin shoreline, July 2012

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Frequently-anticipated questions:

What does this data set describe?

Title:
Spatially referenced oblique aerial photography of the Golovin shoreline, July 2012
Abstract:
In July 2012, a helicopter-based crew photographed approximately 22 miles (35 km) of shoreline near Golovin, Alaska, from the Yuonglik River delta southeast to Portage Creek. During this flight 572 oblique aerial photographs were collected and spatially referenced using a Garmin Dakota 20 handheld GPS.
Supplemental_Information:
One shapefile, a short manuscript that houses an index image, and the complete collection of oblique aerial photographs are provided in this publication. The point shapefile provides the spatial location where each photograph was taken. For ease of use, the oblique aerial photographs are grouped into six separate .zip file downloads. The image group divisions are each composed of approximately 100 photographs, grouped by position along the shoreline. Specific image file names and image file groups are listed in the provided point shapefile. Photography of the shoreline in the vicinity of the town of Golovin can be found in the image group golovin-shoreline-obliques-4, and the community fish camp, including extensive ice-deposited sediments from the November 2011 storm, can be found in golovin-shoreline-obliques-2. The DGGS metadata standard extends the FGDC standard to include elements that are required to facilitate our internal data management. These elements, referred to as "layers," group and describe files that have intrinsic logical or topological relationships. Attribute information for the layers (entity) is included in this metadata file under the "Entity_and_Attribute_Information" section. The layers are titled: >golovin-photo-points: points showing the locations of 572 oblique aerial photographs from Golovin, AK >border: outline shape of the study area
  1. How should this data set be cited?

    DeRaps, M.R., and Kinsman, N.E.M., 2012, Spatially referenced oblique aerial photography of the Golovin shoreline, July 2012: Raw Data File RDF 2012-4, Alaska Division of Geological & Geophysical Surveys, Fairbanks, AK, USA.

    Online Links:

    Other_Citation_Details: 2 p.

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -163.200683
    East_Bounding_Coordinate: -162.841370
    North_Bounding_Coordinate: 64.662534
    South_Bounding_Coordinate: 64.472963

  3. What does it look like?

  4. Does the data set describe conditions during a particular time period?

    Calendar_Date: 15-Jul-2012
    Currentness_Reference: ground condition

  5. What is the general form of this data set?

    Geospatial_Data_Presentation_Form: vector digital data, digital images

  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.

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

      The map projection used is Albers Conical Equal Area.

      Projection parameters:
      Standard_Parallel: 55.000000
      Standard_Parallel: 65.000000
      Longitude_of_Central_Meridian: -154.000000
      Latitude_of_Projection_Origin: 50.000000
      False_Easting: 0
      False_Northing: 0

      Planar coordinates are encoded using coordinate pair
      Abscissae (x-coordinates) are specified to the nearest 50
      Ordinates (y-coordinates) are specified to the nearest 50
      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.
      The flattening of the ellipsoid used is 1/298.257222.

  7. How does the data set describe geographic features?

    rdf2012-4-golovin-photo-points.shp
    Points showing the locations of 572 oblique aerial photographs from the community of Golovin (Source: Alaska Division of Geological & Geophysical Surveys)

    FrameID
    Unique sequential image identifier (Source: Alaska Division of Geological & Geophysical Surveys)

    Range of values
    Minimum:GLV12_001
    Maximum:GLV12_572

    ALBERS_X
    X coordinate of image location, Coordinate System: NAD_1983_Alaska_Albers (Source: Alaska Division of Geological & Geophysical Surveys)

    Range of values
    Minimum:-438133.5542
    Maximum:-423404.3914
    Units:meters

    ALBERS_Y
    Y coordinate of image location, Coordinate System: NAD_1983_Alaska_Albers (Source: Alaska Division of Geological & Geophysical Surveys)

    Range of values
    Minimum:1642483.7406
    Maximum:1661817.3932
    Units:meters

    StillPhoto
    Image file name (Source: Alaska Division of Geological & Geophysical Surveys)

    Range of values
    Minimum:GLV12_001.jpg
    Maximum:GLV12_572.jpg

    DateTime
    The date and time photograph was taken in the following format: YYYY:MM:DD HH:MM:SS Military Format, Alaska Standard Time (Source: Alaska Division of Geological & Geophysical Surveys)

    Range of values
    Minimum:2012:07:15 18:26:26
    Maximum:2012:07:15 18:49:43

    FileName
    The image group zip file package for each photograph. Use this key to find the correct download on the publication download site. (Source: Alaska Division of Geological & Geophysical Surveys)

    ValueDefinition
    golovin-shoreline-obliques-01Photo group number for download
    golovin-shoreline-obliques-02Photo group number for download
    golovin-shoreline-obliques-03Photo group number for download
    golovin-shoreline-obliques-04Photo group number for download
    golovin-shoreline-obliques-05Photo group number for download
    golovin-shoreline-obliques-06Photo group number for download

    rdf2012-4-border
    polygon outlining general boundary of data extent (Source: Alaska Division of Geological & Geophysical Surveys)

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)

  2. Who also contributed to the data set?

    This RDF is funded with qualified outer continental shelf oil and gas revenues by the Coastal Impact Assistance Program, U.S. Fish and Wildlife Service, and U.S. Department of the Interior. The views and conclusions contained in this document are those of the authors and should not be interpreted as representing the opinions or policies of the U.S. Government. Mention of trade names or commercial products does not constitute their endorsement by the U.S. Government.

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

    Alaska Division of Geological & Geophysical Surveys
    c/o James Weakland
    GIS Analyst
    3354 College Road
    Fairbanks, AK 99709-3707
    USA

    (907)451-5029 (voice)
    dggsgis@alaska.gov

    Hours_of_Service: 8 am to 4:30 pm, Monday through Friday, except State holidays

Why was the data set created?

The purpose of this publication is to provide a spatial reference for oblique aerial photographs taken along the Golovin shoreline in July 2012. The oblique aerial imagery is intended to serve as a photographic reference of coastal features and conditions at the time of collection.

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: Jul-2012 (process 1 of 3)
    Acquisition of Oblique Aerial Images: The Golovin shoreline was photographed from a low flying (<500 ft AGL) south bound helicopter on July 15, 2012. Coastal Hazards Program lead, Nicole Kinsman, took photographs using a hand-held Cannon PowerShot ELPH 100 HS digital camera collecting 12 Megapixel 4000x3000 (180 dpi) imagery. The photograph collection began at 6:20 pm AKST at the Yuonglik River delta and ended at 6:50 pm AKST at Portage Creek. All photos were linked to GPS tracks logged with a Garmin Dakota 20 handheld GPS.

    Date: Sep-2012 (process 2 of 3)
    GPS and camera clock synchronization: The clocks of both the camera and GPS were synchronized using GeoSetter software. This step was necessary in order to link the camera's photographs with the spatial location provided by the GPS. Each of the image files was geotagged with a GPS latitude and longitude (DD; MM: S.SSSS) that can be accessed under the image properties.

    Date: Sep-2012 (process 3 of 3)
    Shapefile creation: Used the ArcGIS 10.1 GeoTagged Photos to Points tool to convert the GeoSetter tagged image files into xy coordinates. The coordinates were then projected into the Alaska Albers coordinate system (using NAD_1927_To_WGS_1984_7+NAD_1927_To_NAD_1983_Alaska to transform between the WGS84 and NAD83 datums) and exported as a shapefile. From there attribute fields were added and modified in order to provide additional information and organization.

  3. What similar or related data should the user be aware of?

    DeRaps, M.R., and Kinsman, N.E.M., 2012, Spatially referenced oblique aerial photography of the Eastern Norton Sound shoreline, July 2011: Raw Data File RDF 2011-5, Alaska Division of Geological & Geophysical Surveys, Fairbanks, AK, USA.

    Online Links:

    Other_Citation_Details: 3 DVDs

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

  1. How well have the observations been checked?

    The accuracies of the photo points are dependent upon the horizontal positional accuracy of the handheld GPS unit and camera and GPS clock synchronization. The clocks of both the camera and GPS were synchronized in order to link the camera's photographs with the spatial location provided by the GPS.

  2. How accurate are the geographic locations?

    Accuracies of photo points are dependent on the handheld GPS units used to track the helicopter's position. According to the Garmin manual, typical horizontal accuracies for the Dakota 20 are less than 10 m.

  3. How accurate are the heights or depths?

  4. Where are the gaps in the data? What is missing?

    Oblique aerial photographs are provided for the section of Golovin shoreline from the Yuonglik River delta 22 miles southeast to Portage Creek. Photographs were taken approximately every 50 to 100 meters from a flying height of less than 500 feet above ground level (AGL).

  5. How consistent are the relationships among the observations, including topology?

    The following logical consistency test was performed: photograph content were checked against the photo's geospatial location on orthorectified SPOT5 satellite imagery.

How can someone get a copy of the data set?

Are there legal restrictions on access or use of the data?

Access_Constraints:
This report, map, and/or dataset is available directly from the State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys (see contact information below).
Use_Constraints:
Any hard copies or published datasets utilizing these datasets shall clearly indicate their source. If the user has modified the data in any way, the user is obligated to describe the types of modifications the user has made. The user specifically agrees not to misrepresent these datasets, nor to imply that changes made by the user were approved by the State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys. The State of Alaska makes no express or implied warranties (including warranties for merchantability and fitness) with respect to the character, functions, or capabilities of the electronic data or products or their appropriateness for any user's purposes. In no event will the State of Alaska be liable for any incidental, indirect, special, consequential, or other damages suffered by the user or any other person or entity whether from the use of the electronic services or products or any failure thereof or otherwise. In no event will the State of Alaska's liability to the Requestor or anyone else exceed the fee paid for the electronic service or product.

  1. Who distributes the data set? (Distributor 1 of 1)

    Alaska Division of Geological & Geophysical Surveys
    3354 College Road
    Fairbanks, AK 99709-3707
    USA

    (907)451-5020 (voice)
    (907)451-5050 (FAX)
    dggspubs@alaska.gov

    Hours_of_Service: 8 am to 4:30 pm, Monday through Friday, except State holidays
    Contact_Instructions:
    Please view our website (<http://www.dggs.alaska.gov>) for the latest information on available data. Please contact us using the e-mail address provided above when possible.
  2. What's the catalog number I need to order this data set?

    RDF 2012-4

  3. What legal disclaimers am I supposed to read?

    The State of Alaska makes no express or implied warranties (including warranties of merchantability and fitness) with respect to the character, function, or capabilities of the electronic services or products or their appropriateness for any user's purposes. In no event will the State of Alaska be liable for any incidental, indirect, special, consequential, or other damages suffered by the user or any other person or entity, whether from the use of the electronic services or products, any failure thereof, or otherwise, and in no event will the State of Alaska's liability to the requestor or anyone else exceed the fee paid for the electronic service or product.

  4. How can I download or order the data?

Who wrote the metadata?

Dates:
Last modified: 01-Oct-2012
Metadata author:
Metadata manager
3354 College Road
Fairbanks, AK 99709-3707
USA

(907)451-5020 (voice)

Metadata standard:
FGDC Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)
Metadata extensions used:

Generated by mp version 2.9.6 on Mon Oct 1 13:28:50 2012