1988 Mosaic of Aerial Photography of the Salt River Bay National Historical Park and Ecological Preserve, St. Croix, USVI

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Frequently anticipated questions:


What does this data set describe?

Title:
1988 Mosaic of Aerial Photography of the Salt River Bay National Historical Park and Ecological Preserve, St. Croix, USVI
Abstract:
Aerial photographs taken by NOAA's National Geodetic Survey during 1988 were mosaicked and orthorectified by the Biogeography Program. The resulting image was used to digitize benthic, land cover and mangrove habitat maps of the Salt River Bay National Historic Park and Ecological Preserve (National Park Service), on St. Croix, in the U.S. Virgin Islands.

The mosaic is centered on the National Park Service Site, located on the north central coast of St. Croix, and extends beyond the park boundaries approximately 0.5 - 4.0 km.

  1. How should this data set be cited?

    Department of Commerce (DOC), National Oceanic and Atmospheric Administration (NOAA), National Ocean Service (NOS), National Centers for Coastal Ocean Science (NCCOS), Center for Coastal Monitoring and Assessment (CCMA), Biogeography Program, 2004, 1988 Mosaic of Aerial Photography of the Salt River Bay National Historical Park and Ecological Preserve, St. Croix, USVI: NOAA's Ocean Service, National Centers for Coastal Ocean Science (NCCOS), Silver Spring, MD.

    Online Links:

    This is part of the following larger work.

    Department of Commerce (DOC), National Oceanic and Atmospheric Administration (NOAA), National Ocean Service (NOS), National Centers for Coastal Ocean Science (NCCOS), Center for Coastal Monitoring and Assessment (CCMA), Biogeography Program, 2004, An Ecological Characterization of Salt River Bay National Historic Park and Ecological Preserve.

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -64.803311
    East_Bounding_Coordinate: -64.712009
    North_Bounding_Coordinate: 17.818756
    South_Bounding_Coordinate: 17.740332

  3. What does it look like?

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

    Calendar_Date: 24-Nov-1988
    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 17181 x 19203 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: 20
      Transverse_Mercator:
      Scale_Factor_at_Central_Meridian: 0.999600
      Longitude_of_Central_Meridian: -63.000000
      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 0.500000
      Ordinates (y-coordinates) are specified to the nearest 0.500000
      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 6378137.000000.
      The flattening of the ellipsoid used is 1/298.257222.

  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?

    Department of Commerce (DOC), National Oceanic and Atmospheric Administration (NOAA), National Ocean Service (NOS), National Centers for Coastal Ocean Science (NCCOS), Center for Coastal Monitoring and Assessment (CCMA), Biogeography Program

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

    Department of the Interior (DOI), National Park Service (NPS), Salt River Bay National Historic Park and Ecological Preserve
    National Park Service (NPS)
    Christiansted, St. Croix, U.S. Virgin Islands 00820-4611

    (340) 773-1460 (voice)
    zandy_hillis-starr@nps.gov


Why was the data set created?

The image was used to create benthic and mangrove habitat maps of the Salt River Bay National Historic Park and Ecological Preserve. The maps support current and future monitoring and management efforts at the site, and support programmatic objectives of the NPS service-wide Inventory and Monitoring Program. In addition to the habitat maps, the georeferenced image may by utilized by the park to examine other resource management issues, including development, deforestation, erosion, etc.


How was the data set created?

  1. From what previous works were the data drawn?

    NGS aerial photos (source 1 of 1)
    National Oceanic and Atmospheric Administration (NOAA), National Ocean Service (NOS), National Geodetic Survey (NGS), 2005, NGS Color Aerial Photography: MD, Silver Spring.

    Other_Citation_Details:
    These photographs were mosaiced and georeferenced by NOAA's National Ocean Service (NOS), National Centers for Coastal Ocean Science (NCCOS), Center for Coastal Monitoring and Assessment (CCMA), Biogeography Program
    Type_of_Source_Media: aerial photography and scanned photographs
    Source_Contribution:
    Benthic features were interpreted and mapped from NGS aerial photos of the Salt River Bay region of aerial photographs of St. Croix, U.S.V.I.

  2. How were the data generated, processed, and modified?

    Date: Nov-2003 (process 1 of 1)
    Ground control points, camera calibration data, and USGS DTM data were used to orthorectify 1200 dpi scans of the aerial photos using PCI Geomatica OrthoEngine version 9.1.2. Scanned photos were loaded into OrthoEngine with survey-grade GPS data, camera calibration factors, DTM data, and other corrective measures to eliminate spatial distortion. Once a satisfactory spatial model had been produced (RMS less than 1) the optimal sections of each photo were selected to minimize sun glint, turbidity, etc. and maximize area of interpretable bottom features.

    Person who carried out this activity:

    National Oceanic and Atmospheric Administration (NOAA), National Ocean Service (NOS), National Centers for Coastal Ocean Science (NCCOS), Center for Coastal Monitoring and Assessment (CCMA), Biogeography Program
    Attn: Tim Battista
    1305 East-West Hwy
    Silver Spring, MD 20910

    301-713-3028 (voice)
    301-713-4388 (FAX)
    tim.battista@noaa.gov

    Hours_of_Service: 8 a.m. - 4:30 p.m.
  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?

    Fixed ground control points were selected through examination of imagery, and located in the field. GPS data was collected at each point, and approximately 10-15 points were utilized to orthorectify the imagery. Several additional points were subsequently used to calculate horizontal accuracy:

    Residuals in meters (root mean square error): x: 1.09, y:1.21 Pixel size: 0.5 x 0.5 m

  3. How accurate are the heights or depths?

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

    Mosaicked images were originally photographed at 1:20,000, and scanned from diapositives at a resolution of 25 microns, with pixel size of 0.5 x 0.5 m. Images that covered the desired spatial extent (study area), and that minimized water glare and cloud cover were selected for orthorectification, and mosaicked. Extent of mosaic extends beyond the boundaries of the study area approximately 0.5 km - 4 km.

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

    These data are believed to be logically consistent, although not tested. Geometry appears topologically clean.


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: Not for Navigation

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

    Department of the Interior (DOI), National Park Service (NPS), Salt River Bay National Historic Park and Ecological Preserve
    National Park Service (NPS)
    Christiansted, St. Croix, U.S. Virgin Islands 00820-4611

    (340) 773-1460 (voice)
    zandy_hillis-starr@nps.gov

  2. What's the catalog number I need to order this data set?

    Downloadable Data

  3. What legal disclaimers am I supposed to read?

    The National Oceanic and Atmospheric Administration (NOAA) National Centers for Coastal Ocean Science (NCCOS) produced this data for the Salt River Bay National Historic Park and Ecological Preserve. NCCOS Biogeography Program does not guarantee the accuracy of the geographic features or attributes. Please see the metadata records for each data set for complete information on the source, limitations, and proper use.

    Disclaimer- While every effort has been made to ensure that these data are accurate and reliable within the limits of the current state of the art, NOAA cannot assume liability for any damages caused by any errors or omissions in the data, nor as a result of the failure of the data to function on a particular system. NOAA makes no warranty, expressed or implied, nor does the fact of distribution constitute such a warranty.

  4. How can I download or order the data?


Who wrote the metadata?

Dates:
Last modified: 18-Dec-2012
Metadata author:
Matt Kendall
National Oceanic and Atmospheric Administration (NOAA), National Ocean Service (NOS), National Centers for Coastal Ocean Science (NCCOS), Center for Coastal Monitoring and Assessment (CCMA), Biogeography Program
1305 East-West Highway
Silver Spring, MD 20910

301-713-3028 (voice)
301-713-4388 (FAX)

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


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