Spatially referenced oblique aerial photography of the Eastern Norton Sound shoreline, July 2011

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Frequently-anticipated questions:


What does this data set describe?

Title:
Spatially referenced oblique aerial photography of the Eastern Norton Sound shoreline, July 2011
Abstract:
In July 2011, a helicopter-based crew photographed approximately 180 miles of shoreline along the eastern edge of Norton Sound, from Cape Denbigh to south of Unalakleet, AK. During this flight 2,180 oblique aerial photographs were collected and spatially referenced using a Garmin Dakota 20, handheld GPS. The communities of Unalakleet and Shaktoolik lie along the flight-line of this project.
Supplemental_Information:
One shapefile, an Excel file, and the complete collection of oblique aerial photographs are provided in this publication. A point file (replicated in both Excel and shapefile formats) provides the spatial location where each photograph was taken. For ease of use, the oblique aerial photographs are grouped into 19 separate .zip file downloads. The image group divisions are composed of approximately 100 photos and are grouped by general shoreline position and characterization. Image file names and image file groups are listed in the point files. Photography of the shoreline in the vicinity of Unalakleet and Shaktoolik can be found in the image groups norton-sound-shoreline-obliques-15 and norton-sound-shoreline-obliques-07, respectively. The DGGS metadata standard extends the FGDC standard to include several elements that are required to facilitate internal data management. These elements, referred to as 'layers', group and describe files that have intrinsic logical or topological relationships. This dataset is described by one layer titled:
norton-sound-photo-points	Points showing the locations of 2180 oblique aerial photographs from eastern Norton Sound (these points are provided in both .xlsx and shapefile formats)
  1. How should this data set be cited?

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

    Online Links:

    Other_Citation_Details: 3 DVDs

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -161.533151
    East_Bounding_Coordinate: -160.762814
    North_Bounding_Coordinate: 64.557607
    South_Bounding_Coordinate: 63.697326

  3. What does it look like?

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

    Calendar_Date: 30-Jul-2011
    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 row and column
      Abscissae (x-coordinates) are specified to the nearest 0.002048
      Ordinates (y-coordinates) are specified to the nearest 0.002048
      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?

    rdf2011-5-norton-sound-photo-points.shp
    Points showing the locations of 2180 oblique aerial photographs from eastern Norton Sound (Source: Alaska Division of Geological & Geophysical Surveys)

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

    Range of values
    Minimum:NS11_0910
    Maximum:NS11_3099

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

    Range of values
    Minimum:-362686.374935
    Maximum:-332015.92444
    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:1543901.64244
    Maximum:1638796.72345
    Units:meters

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

    Range of values
    Minimum:NS11_0910.jpg
    Maximum:NS11_3099.jpg

    DateTime_s
    The date and time photograph was taken in the following format: YYYYMMDDHHMMSS, Alaska Standard Time. (Source: Alaska Division of Geological & Geophysical Surveys)

    Range of values
    Minimum:20110730092239
    Maximum:20110730113820

    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
    norton-sound-shoreline-obliques-01norton-sound-shoreline-obliques-01-910-1011.zip
    norton-sound-shoreline-obliques-02norton-sound-shoreline-obliques-02-1012-1141.zip
    norton-sound-shoreline-obliques-03norton-sound-shoreline-obliques-03-1142-1249.zip
    norton-sound-shoreline-obliques-04norton-sound-shoreline-obliques-04-1250-1369.zip
    norton-sound-shoreline-obliques-05norton-sound-shoreline-obliques-05-1370-1485.zip
    norton-sound-shoreline-obliques-06norton-sound-shoreline-obliques-06-1486-1597.zip
    norton-sound-shoreline-obliques-07norton-sound-shoreline-obliques-07-1598-1764.zip
    norton-sound-shoreline-obliques-08norton-sound-shoreline-obliques-08-1765-1922.zip
    norton-sound-shoreline-obliques-09norton-sound-shoreline-obliques-09-1923-1995.zip
    norton-sound-shoreline-obliques-10norton-sound-shoreline-obliques-10-1996-2111.zip
    norton-sound-shoreline-obliques-11norton-sound-shoreline-obliques-11-2112-2235.zip
    norton-sound-shoreline-obliques-12norton-sound-shoreline-obliques-12-2236-2353.zip
    norton-sound-shoreline-obliques-13norton-sound-shoreline-obliques-13-2354-2478.zip
    norton-sound-shoreline-obliques-14norton-sound-shoreline-obliques-14-2479-2595.zip
    norton-sound-shoreline-obliques-15norton-sound-shoreline-obliques-15-2596-2689.zip
    norton-sound-shoreline-obliques-16norton-sound-shoreline-obliques-16-2690-2803.zip
    norton-sound-shoreline-obliques-17norton-sound-shoreline-obliques-17-2804-2895.zip
    norton-sound-shoreline-obliques-18norton-sound-shoreline-obliques-18-2896-2999.zip
    norton-sound-shoreline-obliques-19norton-sound-shoreline-obliques-19-3000-3099.zip


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?

    State of Alaska, Department of Natural Resources, 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.


Why was the data set created?

The purpose of this publication is to provide a spatial reference for oblique aerial photographs taken along the Eastern Norton Sound shoreline in July 2011. 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-2011 (process 1 of 3)
    Acquisition of Oblique Aerial Images: The Norton Sound shoreline was photographed from a low flying south bound helicopter on July 30, 2011. The crew employed a hand-held Cannon PowerShot ELPH 100 HS digital camera to collect 12 Megapixel 4000x3000 (180 dpi) imagery. The photograph collection began at 9:00 am AKST north of Shaktoolik and ended at 12:00 noon AKST south of Unalakleet. All photos were linked to GPS tracks logged with a Garmin Dakota 20 handheld GPS.

    Date: Oct-2011 (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.

    Date: Oct-2011 (process 3 of 3)
    Shapefile creation: Used ArcGIS 10 to convert the GeoSetter created KMZ files to a shapefile with location, time, and photo identifier information.

  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 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 Norton Sound shoreline from approximately one mile North of Shaktoolik, AK to one mile South of Unalakleet, AK. There are two locations where the flight path and associated photographs deviate from the coast. The first location is within the community of Shaktoolik, caused by the re-fueling of the helicopter. The second location, just North of Unalakleet, was caused by reduced visibility that forced the pilot to circle until he gained special IFR clearance. The possible flight lines near Unalakleet were restricted due to reduced visibility, therefore photos are taken from lower altitudes and closer to the shoreline in this segment. The Unalakleet airport reported 2.5 to 5 mile visibility during the flight window for image collection.

  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 LANDSAT imagery.


How can someone get a copy of the data set?

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

Access_Constraints:
The dataset(s) is (are) 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. 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)

    State of Alaska, Department of Natural Resources, 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 2011-5

  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 requester 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: 06-Jan-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 Fri Jan 6 17:29:33 2012