24-bit True Color SW Quadrant of RINCON NE, Orthophoto Production for Puerto Rico and US Virgin Island (rincon4_2004.tif)

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Frequently anticipated questions:

What does this data set describe?

Title:
24-bit True Color SW Quadrant of RINCON NE, Orthophoto Production for Puerto Rico and US Virgin Island (rincon4_2004.tif)
Abstract:
This dataset is a single orthoimage from a collection of GeoTIFF format natural color orthoimages covering the islands of Puerto Rico, Mona, Desecheo, Culebra, Vieques, and the US Virgin Islands. An orthophoto is remotely sensed image data in which displacement of features in the image caused by terrain relief and sensor orientation have been mathematically removed. Orthophotography combines the image characteristics of a photograph with the geometric qualities of a map. Each orthophoto provides imagery for a nominal 3.75 minute (in latitude and longitude) cell area. The source imagery was obtained in October 2004 and used to produce orthophotos with a one meter ground resolution. Imagery was acquired at 0.86 meter ground sample distance (GSD) resolution. Flight height maintained during mission was 27,000 feet AGL. The imagery was captured at 12-bit radiometric resolution and converted to 8-bit radiometric resolution during post processing. The imagery was obtained and processed by all digital means beginning with data acquisition using a Leica ADS40 Digital Airborne Sensor. The orthophotos are available in GeoTIFF form. The projected coordinate system is UTM zone 19 N, NAD 83, GRS 80, Units Meters.
Supplemental_Information:
The data design specifications for this product includes several methods directed to insure its quality, consistency, and usability. These specifications address some of the technical issues associated with orthoimage production: 1) the tops of buildings and other structures elevated above the surface of the ground 'tilt' away from the center point of the source photography and from their own bases as a result of perspective and their height which is not compensated for in digital elevation models of the ground surface and 2) individual orthoimages may be assembled from several source images (strips).
  1. How might this data set be cited?
    United States Army Corps of Engineers, 2004, 24-bit True Color SW Quadrant of RINCON NE, Orthophoto Production for Puerto Rico and US Virgin Island (rincon4_2004.tif): 3001, Inc., Gainesville, FL.

    Online Links:

    This is part of the following larger work.

    Thieler, E.R., Rodriguez, R.W., and Himmelstoss, E.A., 2007, Historical Shoreline Changes at Rincon, Puerto Rico, 1936-2005: Open-File Report 2007-1017, U.S. Geological Survey, Coastal and Marine Geology Program, Woods Hole Science Center, Woods Hole, MA.

    Online Links:

  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -67.253586
    East_Bounding_Coordinate: -67.183948
    North_Bounding_Coordinate: 18.314812
    South_Bounding_Coordinate: 18.245466
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
    Calendar_Date: 21-Sep-2004
    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 7605 x 7637 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: 19
      Transverse_Mercator:
      Scale_Factor_at_Central_Meridian: 0.999600
      Longitude_of_Central_Meridian: -69.000000
      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 1.000000
      Ordinates (y-coordinates) are specified to the nearest 1.000000
      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?
    Band_1
    Red band of histogram (Source: U.S. Geological Survey)
    ObjectID
    Internal feature number. (Source: ESRI) Sequential unique whole numbers that are automatically generated.
    Value
    Pixel value for red band of histogram (Source: U.S. Geological Survey) information unavailable from original metadata
    Count
    Total count of value in image (Source: U.S. Geological Survey) information unavailable from original metadata
    Band_2
    Green Band of histogram (Source: U.S. Geological Survey)
    ObjectID
    Internal feature number. (Source: ESRI) Sequential unique whole numbers that are automatically generated.
    Value
    Pixel value for green band of histogram (Source: U.S. Geological Survey) information unavailable from original metadata
    Count
    Total count of value in image (Source: U.S. Geological Survey) information unavailable from original metadata
    Band_3
    Blue band of histogram (Source: U.S. Geological Survey)
    ObjectID
    Internal feature number. (Source: ESRI) Sequential unique whole numbers that are automatically generated.
    Value
    Pixel value for blue band of histogram (Source: U.S. Geological Survey) information unavailable from original metadata
    Count
    Total count of value in image (Source: U.S. Geological Survey) information unavailable from original metadata

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
    • United States Army Corps of Engineers
  2. Who also contributed to the data set?
    Acknowledgment of the United States Army Corps of Engineers would be appreciated for products derived from these data.
  3. To whom should users address questions about the data?
    U.S. Army Corps of Engineers
    1222 Spruce Street
    St. Louis, MO
    USA

    314-331-8385 (voice)
    314-331-8071 (FAX)
    Robert.D.Mesko@mvs02.usace.army.mil
    Hours_of_Service: Monday through Friday 8:00 AM to 5:00 PM (Central Time)

Why was the data set created?

The purpose of this project is to provide the United States Department of Agriculture's (USDA) Aerial Photography Field Office (APFO) with current true-color digital orthophotography for Puerto Rico, the U.S. Virgin Islands, and the surrounding islands. The APFO is the prime source of aerial imagery for USDA's research needs. The contracting agency for the project is the St. Louis District of the U.S. Army Corp of Engineers (USACE).

How was the data set created?

  1. From what previous works were the data drawn?
    PRUSVI (source 1 of 1)
    3001, Inc., unknown, Orthophoto Production for Puerto Rico and US Virgin Islands: 3001, Inc., Gainesville, FL.

    Type_of_Source_Media: digital file
    Source_Contribution: Image Acquisition for Orthophoto Production.
  2. How were the data generated, processed, and modified?
    Date: 2004 (process 1 of 2)
    Ground control consisted of photo identifiable surveyed points. The imagery was collected at an altitude of 8229m using an ADS40 digital sensor. Image quality was verified during the post flight review phase. Factors considered during this review included but were not limited to the presence of smoke and/or cloud cover, contrails, light conditions and sun glint. The triangulated strips were rectified with a current LIDAR DEM of the area. The red, green, and blue bands were combined to produce the orthophoto.
    The ADS40 sensor collects twelve bit image data which requires radiometric adjustment for output in standard eight bit image channels. Converting to eight bit results in a reduction of the color range from 4096 to 256 - thus loss of radiometric detail is inevitable. The extra dynamic range of the sensor permits greater object differentiation in shadows and in bright areas. The sixteen bit dynamic range permitted the imagery to be more effectively color balanced than is possible with eight bit imagery. This was accomplished by performing tonal enhancements immediately prior to the reduction from sixteen bit to eight bit data. In addition to color balancing these eight bit images were adjusted to create seamless imagery to the highest extent practically achievable.
    The imagery was mosaicked using a combination of automated and manual seamlines generation. Project specified tiles were extracted from the mosaic. Final image tiles were reviewed for artifacts and anomalies and adjusted as part of quality control procedures. Adjacent images are compared for consistency in overlap regions. Person who carried out this activity:
    3001, Inc.
    3601 SW 2nd Ave., Suite Y
    Gainesville, FL
    USA

    352-379-3001 (voice)
    Date: 31-Aug-2021 (process 2 of 2)
    The metadata was edited to remove errors as well as update some information. Edits include updating the citation section with the DOI link and a slight modification to the dataset title, added the USGS Thesaurus, added keywords section with USGS persistent identifier as theme keyword, replaced distribution liability with FSP statement. Other unrequired blank fields were deleted, duplicate entries within a field were deleted, required empty elements were fixed with “information unavailable from original metadata”. The metadata date (20070223), but not the contact (except email and contact instructions) was updated. The metadata available from a harvester may supersede metadata available from the publication. Compare the metadata dates to determine which metadata file is most recent. The metadata available from a harvester may supersede metadata available from the publication. Compare the metadata dates to determine which metadata file is most recent. Person who carried out this activity:
    U.S. Geological Survey
    Attn: VeeAnn A. Cross
    Marine Geologist
    384 Woods Hole Road
    Woods Hole, MA

    508-548-8700 x2251 (voice)
    508-457-2310 (FAX)
    vatnipp@usgs.gov
  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?
    These data are compiled to meet project specifications, which are that 90 percent of all well-defined points tested must fall within 10 meters.
  3. How accurate are the heights or depths?
  4. Where are the gaps in the data? What is missing?
    The data provided in this publication is a subset of coverage for the Rincon study area. Additional data is available for all of the islands of Puerto Rico, Culebra, Vieques, Mona, Desecheo, and the US Virgin Islands. Each orthophoto has an overedge of approximately 300 meters on all sides of its centering 3.75 minute cell.
  5. How consistent are the relationships among the observations, including topology?
    Sample points taken from overlapping areas of adjacent image strips that contributed image chips to each orthophoto tile are typically consistent to the 2-3 pixel level. This not only ensures that a consistent mosaic can be created from the adjacent image strips acquired with the ADS40 pushbroom scanner but also means that the images have good precision and as a group are spatially self-consistent. Imagery was rectified to a recent LIDAR derived DEM. Aerotriangulation generates a RMSE for the positional accuracy of photo control for the final block adjustment to insure that the geo-reference accuracy of the imagery block is more than sufficient to support the specified orthorectification accuracy.

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:
The color 1-meter orthophotography acquired of Puerto Rico & Virgin Islands in 2003 & 2004 resides in the public domain and is stored at the U.S. Department of Agriculture's (USDA) Farm Service Agency (FSA) through interagency agreement number ISA-COE-0351.
  1. Who distributes the data set? (Distributor 1 of 1)
    E. Robert Thieler
    U.S. Geological Survey
    Research Geologist
    384 Woods Hole Road
    Woods Hole, MA
    USA

    508-548-8700 x2350 (voice)
    508-457-2310 (FAX)
    rthieler@usgs.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?
    Unless otherwise stated, all data, metadata and related materials are considered to satisfy the quality standards relative to the purpose for which the data were collected. Although these data and associated metadata have been reviewed for accuracy and completeness and approved for release by the U.S. Geological Survey (USGS), no warranty expressed or implied is made regarding the display or utility of the data for other purposes, nor on all computer systems, nor shall the act of distribution constitute any such warranty.
  4. How can I download or order the data?
  5. What hardware or software do I need in order to use the data set?
    This image is available as a GeoTIFF image with an accompanying world file. To utilize this data, the user must have an image viewer, image processing or GIS software package capable of importing a GeoTIFF image.

Who wrote the metadata?

Dates:
Last modified: 01-Sep-2021
Metadata author:
U.S. Army Corps of Engineers
Attn: Robert D. Mesko
1222 Spruce Street
St. Louis, MO
USA

314-331-8385 (voice)
314-331-8071 (FAX)
whsc_data_contact@usgs.gov
Hours_of_Service: Monday through Friday 8:00 AM to 5:00 PM (Central Time)
Contact_Instructions:
The metadata contact email address is a generic address in the event the metadata contact is no longer with the USGS.
Metadata standard:
FGDC Content Standards for Digital Geospatial Metadata (FGDC-STD-001-1998)
This page is <https://cmgds.marine.usgs.gov/catalog/whcmsc/open_file_report/ofr2007-1017/rincon4_2004_meta.faq.html>
Generated by mp version 2.9.50 on Tue Sep 21 18:20:22 2021