2010 NOAA Ortho-rectified Mosaic from Color Aerial Imagery of Pensacola Bay, FL - FL0703 - Phase II - Pensacola Bay (NODC Accession 0074383)

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Frequently anticipated questions:


What does this data set describe?

Title:
2010 NOAA Ortho-rectified Mosaic from Color Aerial Imagery of Pensacola Bay, FL - FL0703 - Phase II - Pensacola Bay (NODC Accession 0074383)
Abstract:
Data set contains 2.5km by 2.5km digital orthophotography mosaics. The digital orthophotos in this series have a nominal ground resolution of 1 meter. The digital orthophoto mosaics are three band, 8-bit GeoTIFFs with pyramids and are color balanced to be uniform while still maintaining as much of the original color and appearance as practical. The source imagery was flown on February 6-7, 2010 with a WILD camera with a focal length of 153.28mm. The film was captured by NOAA at a negative scale of 1" = 2,500' or a nominal scale of 1:30,000. Aerotriangulation was performed in BINGO as full bundle block adjustments. The project area extends from Big Lagoon to Navaree Beach and includes Pensacola Bay, Escambia Bay, and East Bay; as well as portions of Santa Rosa Sound, and Santa Rosa Island and various small bays and tributaries to the bays.
Supplemental_Information: The ground sample distance (GSD) for each pixel is 1.0 meter.
  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, 20100628, 2010 NOAA Ortho-rectified Mosaic from Color Aerial Imagery of Pensacola Bay, FL - FL0703 - Phase II - Pensacola Bay (NODC Accession 0074383): 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: -87.4943411
    East_Bounding_Coordinate: -86.7658356
    North_Bounding_Coordinate: 30.7103200
    South_Bounding_Coordinate: 30.2582981

  3. What does it look like?

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

    Beginning_Date: 06-Feb-2010
    Ending_Date: 07-Feb-2010
    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.

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

      Grid_Coordinate_System_Name: Universal Transverse Mercator
      Universal_Transverse_Mercator:
      UTM_Zone_Number: 16
      Transverse_Mercator:
      Scale_Factor_at_Central_Meridian: 0.999600
      Longitude_of_Central_Meridian: -87
      Latitude_of_Projection_Origin: 0
      False_Easting: 500000.00000
      False_Northing: 0.00000

      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 North American Datum 1983.
      The ellipsoid used is GRS80.
      The semi-major axis of the ellipsoid used is 6378206.4.
      The flattening of the ellipsoid used is 1/294.98.

  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?

    This data set was developed for NOAA by Photo Science, Inc..

  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?

Ortho-rectified mosaic tiles are an ancillary product of NOAA's Coastal Mapping Program (CMP), created through a wider Integrated Ocean and Coastal Mapping initiative to increase support for multiple uses of the data.


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: 2010 (process 1 of 1)
    Photo Science's digital orthorectification process relies on four primary production data sources including digital aerial imagery, camera calibration data, ground and airborne control/aerotriangulation data, and the existing DEM as described above. Photo Science rectified all of the image frames to minimize the effects of radial displacement and to ensure radiometric consistency. The rectification process employed a cubic convolution re-sampling method, which sharpens the edges of linear features by sampling 16 of the closest pixels and performs a weighted adjustment. Intergraph OrthoPro software was used to accomplish the rectification of the individual frames. Mosaicking was also accomplished using OrthoPro software. Image blocks were processed using two distinct tonal matching functions. Each image was processed to remove any hotspots in the middle of the frame. During the collection of aerial imagery, more light enters the lens from directly below the camera than does from the corners of the frame. Even though filters are designed to minimize this effect, some hotspots still can occur. Additionally, all of the frames underwent a histogram comparison process and then were matched to provide a seamless tone image. For optimal production performance Photo Science initiated an automatic seamline creation strategy for image mosaicking. Auto-generated seamlines are reviewed and manually adjusted to avoid buildings and other features depicting discontinuity. The mosaic was then reprocessed using manual seamlines to maximize image quality. During the mosaicking process, seamlines were feathered to provide a smooth transition from one image to another. Photo Science utilized a combined automated / manual methodology for maximum cost efficiency and image quality. Tonal matching was accomplished by comparing pixel values in the overlap area of all images. The software modified the histograms of the individual images to achieve an overall mosaic, which will had a uniform tone throughout the images. Orthomosaic files were tiled to a ground distance of 2.5 km by 2.5 km with a ten (10) meter buffer (overlap) around all four edges of the tile. The final format of the tile index was a polygon shapefile projected to NAD 83 in geographic coordinates.

  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?

    The horizontal positional accuracy and the assurance of that accuracy are dependent upon the accuracy of the data inputs to the rectification process. These data inputs include the digital elevation model (DEM), accuracy of control, and methodology used to georeference the imagery that meet NOAA's Coastal Mapping Program standards.

  3. How accurate are the heights or depths?

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

    The extent of image coverage is limited to the acquired flight lines which were planned 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?

    Imagery was collected with a WILD camera with a focal length of 153.28mm. Aerotriangulation was performed in BINGO as full bundle block adjustments. Imagery was orthorectified to a USGS DEM using Z/I Intergraph OrthoPro. Seamlines were drawn and then mosaics were also cut using Z/I Intergraph OrthoPro. Mosaics were checked to ensure they were free of artifiacts, fiducial marks, film tilting or frame borders.


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:
Data set is not for use in litigation. While efforts have been made to ensure that these data are accurate and reliable within the state of the art, NOAA, cannot assume liability for any damages, or misrepresentations, caused by any inaccuracies in the data, or as a result of the data to be used on a particular system. NOAA makes no warranty, expressed or implied, nor does the fact of distribution constitute such a warranty. We do request that you credit the National Oceanic and Atmospheric Administration (NOAA) when you use these photos in a report, publication, or presentation.

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

    NOAA Coastal Services Center
    Attn: Clearinghouse Manager
    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 to Friday, 8 a.m. to 5 p.m., Eastern Standard Time
  2. What's the catalog number I need to order this data set?

    Downloadable Data

  3. What legal disclaimers am I supposed to read?

    Users must assume responsibility to determine the usability of these data. 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: 20-Dec-2012
Last Reviewed: 14-Sep-2011
Metadata author:
National Oceanic and Atmospheric Administration (NOAA), National Ocean Service (NOS), National Geodetic Survey (NGS), Remote Sensing Division Contact_Position: Chief, Remote Sensing Division
1315 East West Highway, N/NGS3
Silver Spring, MD 20910
USA

301-713-2663 (voice)
Mike.Aslasken@noaa.gov

Hours_of_Service: Monday to Friday, 8 a.m. to 5 p.m., Eastern Standard Time.
Metadata standard:
FGDC CSDGM (FGDC-STD-001-1998)


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