LA0801 Ortho-rectified Aerial Imagery of Terrebonne and Timbalier Bays Barrier Islands, Louisiana (NODC Accession 0075828)

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Frequently anticipated questions:


What does this data set describe?

Title:
LA0801 Ortho-rectified Aerial Imagery of Terrebonne and Timbalier Bays Barrier Islands, Louisiana (NODC Accession 0075828)
Abstract:
AERO-METRIC, INC. (AME) was provided aerial photographic imagery collected by NOAA along the shoreline of Louisiana. The purpose of the imagery was to provide digital shoreline and orthophotos for NOAA nautical charts. The area covers the Barrier Islands of Terrebonne and Timbalier Bays on the coast of the State of Louisiana. Ortho-rectified mosaic tiles are not intended for mapping, charting or navigation.
Supplemental_Information: The ground sample distance (GSD) for each pixel is 1.0 m.
  1. How should this data set be cited?

    Department of Commerce (DOC), National Oceanic and Atmospheric Administration (NOAA), National Ocean Service (NOS), National Geodetic Survey (NGS), Remote Sensing Division, 20100330, LA0801 Ortho-rectified Aerial Imagery of Terrebonne and Timbalier Bays Barrier Islands, Louisiana (NODC Accession 0075828): NOAA's Ocean Service, National Geodetic Survey (NGS), Silver Spring, MD.

    Online Links:

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -91.166754
    East_Bounding_Coordinate: -90.114015
    North_Bounding_Coordinate: 29.242384
    South_Bounding_Coordinate: 28.988513

  3. What does it look like?

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

    Beginning_Date: 01-Dec-2007
    Ending_Date: 05-Mar-2008
    Currentness_Reference: ground condition

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

    Geospatial_Data_Presentation_Form: remote-sensing image

  6. How does the data set represent geographic features?

    1. How are geographic features stored in the data set?

      This is a Raster data set. It contains the following raster data types:

      • Dimensions 5008 x 5008 x 1, type Pixel

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

      Grid_Coordinate_System_Name: Universal Transverse Mercator
      Universal_Transverse_Mercator:
      UTM_Zone_Number: 15
      Transverse_Mercator:
      Scale_Factor_at_Central_Meridian: 0.999600
      Longitude_of_Central_Meridian: -93
      Latitude_of_Projection_Origin: 0.000000
      False_Easting: 500000.000000
      False_Northing: 0.000000

      Planar coordinates are encoded using Row and Column
      Abscissae (x-coordinates) are specified to the nearest 1.0
      Ordinates (y-coordinates) are specified to the nearest 1.0
      Planar coordinates are specified in meters

      The horizontal datum used is NAD83.
      The ellipsoid used is GRS80.
      The semi-major axis of the ellipsoid used is 6378137.000000.
      The flattening of the ellipsoid used is 1/298.257221.

  7. How does the data set describe geographic features?


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?

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

    National Oceanic and Atmospheric Administration (NOAA), National Ocean Service (NOS), National Geodetic Survey (NGS), Remote Sensing Division
    Chief, Remote Sensing Division
    1315 East West Highway, N/NGS3
    Silver Spring, MD 20910
    USA

    301-713-2663 (voice)


Why was the data set created?

This data depicts geographic features on the surface of the earth.


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: 01-Oct-2009 (process 1 of 1)
    The digital images were aerotriangulated to support digital ortho image production for the Louisiana Shoreline project area. Airborne GPS and ground check point data was provided by AERO-METRIC, Inc. The project was referenced to the North American Datum of 1983 (NAD83), UTM Coordinate System, Zone 15 horizontally and to the North American Vertical Datum of 1988 (NAVD88) vertically. Units were in meters. The digital images, ABGPS data, and ground check point data were used as inputs to the Zeiss/Intergraph ImageStation Automatic Triangulation (ISAT) softcopy program. ISAT correlated image points and aerotriangulated the block of images to create exposure station exterior orientations. All ground points were manually measured on the imagery. These points were included in the aerotriangulation adjustments for absolute ground location verification. The scale of the aerial photos was 1:50,004. The photography was exposed on 12/1/07 and 3/5/08. Rectification was done using the aerotriangulation data, raw DMC images, and 30 meter NED data. These rectified images were used to draw seamlines. The images were then dodged. The dodged rectified images were mosaicked, balanced, and cut into final image sheets. The final sheets were viewed and artifacts were removed as well as other edits performed.

  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?

    Final ortho-mosaic tiles were used to measure visible control points against surveyed coordinates. The accuracy assessment report can be found at

  3. How accurate are the heights or depths?

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

    The source imagery of the ortho-rectified mosaic tiles are acquired at a higher resolution images than the 1.0 meter ortho-rectified mosaic tiles product. The extent of image coverage is limited to the acquired flight lines which were planned to to map the shoreline and therefore may not include all areas within the bounding coordinates.

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

    The ortho-rectified tiles are visually inspected for image quality and spot check for gross horizontal positional accuracy blunders.


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:
We request that you credit the National Oceanic and Atmospheric Administration (NOAA) when you use these photos in a report, publication, orpresentation.

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

    National Oceanic and Atmospheric Administration (NOAA), National Ocean Service (NOS), NOAA Coastal Services Center
    Clearinghouse Manager
    2234 South Hobson Avenue
    Charleston, SC 29405-2413
    USA

    (843)740-1210 (voice)
    (843)740-1224 (FAX)
    clearinghouse@noaa.gov

    Hours_of_Service: Monday-Friday, 8-5 EST
  2. What's the catalog number I need to order this data set?

    Downloadable Data

  3. What legal disclaimers am I supposed to read?

    These photographs were obtained for use by NGS during the course of its development of potential final products to fulfill its statutory mission.Although NGS is making these photographs available to others who may find the photographs of value, NGS does not warrant, endorse, or recommend the use of these photographs for any given purpose. NGS is providing these photographs "as is," and NGS disclaims any and all warranties, whether expressed or implied, including (without limitation) any implied warranties of merchantability or fitness for a particular purpose. In no event will NGS be liable to you or any third party for any direct, indirect, incidental,consequential, special, or exemplary damages or lost profits resulting from any use or misuse of these data.

  4. How can I download or order the data?


Who wrote the metadata?

Dates:
Last modified: 14-Sep-2011
Last Reviewed: 14-Sep-2011
Metadata author:
National Oceanic and Atmospheric Administration (NOAA), National OceanService (NOS), National Geodetic Survey (NGS), Remote Sensing Division
Chief, Remote Sensing Division
1315 East West Highway, N/NGS3
Silver Spring, MD 20910
USA

301-713-2663 (voice)

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


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