United States Army Corps of Engineers 20080217 raster digital data 401 Dividend Drive, Suite K, Peachtree City, GA 30269 3001, Inc. http://ccma.nos.noaa.gov/ecosystems/coralreef/benthic/ This MrSID (.sid) file is an orthophoto mosaic from a collection of GeoTIFF format natural color and false color infrared orthophotos covering the islands of Puerto Rico, Culebra, Vieques, St. Thomas, St. John, and St. Croix (USVI). 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. The source imagery was obtained from November 2006 through March 2007 and used to produce orthophotos with a one foot ground sample distance (GSD). Imagery was acquired at 0.9 foot GSD resolution. Flight height maintained during mission was 8,650 feet AGL. The imagery was captured at 12-bit radiometric resolution and converted to 8-bit radiometric resolution during post processing. The imagery was captured with 30% sidelap between all adjacent flight lines. The PRVI project area was divided into 20 flight blocks due to neccessary base station and flight line length requirements. The imagery was obtained and processed by all digital means beginning with data acquisition using an ADS40 digital sensor. The orthophotos are also available in GeoTIFF form from the distributor. The purpose of the project is to provide the United States Army Corps of Engineers with current year digital orthophotos covering all of Puerto Rico and the US Virgin Islands. The Corps regularly uses digital orthophotos to support regulatory, land management and acquistion, planning, engineering and habitat restoration projects. The data may also become available to local, state and other federal agencies for their specific management and analysis needs. The one-foot resolution data collected for this project is higher resolution than the previous island-wide collection in 2004, which was one-meter resolution. The data design specifications for this product includes several directed to ensure its quality, consistency, and useability. 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). Resource Description: The data are being provided on an 'as is' basis. The Corps specifically disclaims any warranty, expressed or implied, including, but not limited to, the implied warranties or merchantability and fitness for a particular use. The entire risk as to quality and performance is with the user. In no event will the Corps or its staff be liable for any direct, indirect, incidental, special, consequential, or other damages, including loss of profit, arising out of the use of these data even if the Corps has been advised of the possibility of such damages. All data are intended for resource management use. 200709 200710 Date of image acquisition Complete None planned -64.812985 -64.749299 18.312527 18.279449 CoRIS Discovery Thesaurus Map Images > Aerial Photographs CoRIS Theme Thesaurus EARTH SCIENCE > Biosphere > Zoology > Corals > Reef monitoring and assessment > Mapping > Habitat mapping EARTH SCIENCE > Biosphere > Zoology > Corals > Reef Monitoring and Assessment > Remote Sensing > Aircraft > Aerial Photography none orthophotograph orthoimage ISO 19115 Topic Category imageryBaseMapsEarthCover 010 none U.S. Virgin Islands St. John CoRIS Place Thesaurus COUNTRY/TERRITORY > United States of America > U. S. Virgin Islands > St. John > St. John (18N064W0011) OCEAN BASIN > Atlantic Ocean > Caribbean Sea > Virgin Islands > Virgin Islands > St. John (18N064W0011) CoRIS Region USVI None None. Acknowledgment of the United States Army Corps of Engineers would be appreciated for products derived from these data. U.S. Army Corps of Engineers mailing address

1222 Spruce Street

St. Louis MO 63103-2833 US 314-331-8385 314-331-8071 Robert.D.Mesko@mvs02.usace.army.mil Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 3; ESRI ArcCatalog 9.3.0.1770 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. These data cover all of the islands of Puerto Rico, Culebra, Vieques, and the US Virgin Islands. Each orthophoto has an overedge of approximately 30 meters on all sides of its centering 1.875 minute cell. The accuracy value was determined by measuring photo-identifiable control points collected with GPS survey methods in the orthophotos. 5.00 ASPRS Class I Standard for 200 Scale Mapping for areas defined in the document PR_USVI_DEM_Footprint07_Rev.pdf 10.0 ASPRS Class I Standard for 400 Scale Mapping for areas defined in the document PR_USVI_DEM_Footprint07_Rev.pdf 3001, Inc. 20080217 401 Dividend Drive, Suite K, Peachtree City, GA 30269 3001, Inc. Additional Information: (770) 631-0903 2400 disc 20071022 Date of image acquisition dig_aer_img Flight planning, image acquisition, image processing and image packaging. RLDA 20070115 PO Box 41033, San Juan, Puerto Rico, 00940 RLDA Additional Information: (787)268-6097 2400 disc 20061101 Date ground control was collected photo_control Horizontal and vertical control used to establish positions and elevations for reference and correlation purposes and as input to the aerotriangulation process. 3001, Inc 20050201 raster digital data 401 Dividend Drive, Suite K, Peachtree City, GA 30269 3001, Inc. Additional Information: (770) 631-0903 2400 disc 20050201 Date DEM was processed by 3001, Inc. ortho_dem Ground elevations used for orthorectification process Ground control consisted of photo identifiable surveyed points. The imagery was collected at an altitude of 8650 ft 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 recent DEM of the area provided by 3001, Inc. The vertical accuracy of the DEM varies based on the elevation postings and is generally estimated at 30-45cm. The red, green and blue bands were combined to generate a final natural color orthophoto, and the near - infrared, red and green bands were combined to generate a final false color infrared 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 banancing 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 pecified tiles were extracted from the mosaic. Final image tiles were reviewed for artifacts and anomalies and adjusted as part of quality control procedures. When necessary, local corrections to the imagery were performed to minimize such effects. 20080217 Peter Briere 3001, Inc mailing and physical address

401 Dividend Drive, Suite K

Peachtree City GA 30269 (770) 631-0903 (770) 631-0820 pbriere@3001inc.com 8:00 a.m. to 5:00 p.m. 5 Raster Pixel 11814 21985 1 Lambert Conformal Conic 18.433333 18.033333 -66.433333 17.833333 200000.000000 200000.000000 Row and Column 0.304800 0.304800 meters North American Datum of 1983 Geodetic Reference System 80 6378137.000000 298.257222 U.S. Army Corps of Engineers Mailing Address

1222 Spruce Street

St. Louis MO 63103-2833 US 314-331-8385 314-331-8071 Robert.D.Mesko@mvs02.usace.army.mil Monday through Friday 8:00 AM to 5:00 PM (Central Time) Downloadable Data Translation of files to formats other than those described here is the sole responsibility of individuals downloading the data. 20121220 20100315 U.S. Army Corps of Engineers Mailing Address

1222 Spruce Street

St. Louis MO 63103-2833 US 314-331-8385 314-331-8071 Robert.D.Mesko@mvs02.usace.army.mil Monday through Friday 8:00 AM to 5:00 PM (Central Time) FGDC Content Standards for Digital Geospatial Metadata FGDC-STD-001-1998 Local Time 20100315010200 None 20070901 20071031 http://www.coris.noaa.gov/metadata/records/html/metadata_18064_c7_se.html 4506