United States Army Corps of Engineers 20080217 remote-sensing image 401 Dividend Drive, Suite K, Peachtree City, GA 30269 3001, Inc. http://www1.usgs.gov/vip/buis/buisortho.zip doi:10.5066/F78P5XFW This file is an extract 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. Each orthophoto provides imagery for a standard USGS 1/16th quadrangle map. False color infrared imagery was only generated for those 1/16th quadrangle maps falling within one kilometer of the coast line. 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 available in GeoTIFF form. The projected coordinate system is State Plane Puerto Rico / US Virgin Islands (Zone 5200), NAD 83, GRS 80, Units Meters. 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 insure 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). 20071022 Date of image acquisition Complete None planned Buck Island Reef National Monument and environs -64.630914 -64.607146 17.796054 17.776725 none framework orthoimage National Park Service Theme Category Thesaurus Digital Orthophoto ISO 19115 Topic Category none none Puerto Rico Culebra Vieques U.S. Virgin Islands National Park System Unit Name Thesaurus Buck Island Reef National Monument National Park System Unit Code Thesaurus BUIS 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 9.3.1.3000 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 None 3001, Inc. 20080217 imagery 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 imagery 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 001, 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 specified 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. dig_aer_img photo_control ortho_dem 20080217 Peter Briere 3001, Inc Unknown mailing and physical address

401 Dividend Drive, Suite K

Peachtree City GA 30269 US (770) 631-0903 (770) 631-0820 pbriere@3001inc.com 8:00 a.m. to 5:00 p.m. Metadata imported. C:\army_corp_metadata.xml 20090213 Metadata imported. U:\GIS\STX\images\StCroix_30cm\17064-F5_01.tif.xml 20090626 Metadata imported. C:\imagery_armycorp_meta.xml 20090701 5 Raster Pixel 7111 8200 Lambert Conformal Conic 18.033333 18.433333 -66.433333 17.833333 200000.000000 200000.000000 row and column 0.304800 0.297388 meters North American Datum of 1983 Geodetic Reference System 80 6378137.000000 298.257222 buisortho.tif.vat Table United States Army Corps of Engineers ObjectID Internal feature number. ESRI Sequential unique whole numbers that are automatically generated. Value Integer. ESRI Unique whole numbers. BinValues Integer. ESRI Unique whole numbers. Count Integer. ESRI Unique whole numbers. buisortho.tif.vat Table United States Army Corps of Engineers ObjectID Internal feature number. ESRI Sequential unique whole numbers that are automatically generated. Value Integer. ESRI Unique whole numbers. BinValues Integer. ESRI Unique whole numbers. Count Integer. ESRI Unique whole numbers. buisortho.tif.vat Table United States Army Corps of Engineers ObjectID Internal feature number. ESRI Sequential unique whole numbers that are automatically generated. Value Integer. ESRI Unique whole numbers. BinValues Integer. ESRI Unique whole numbers. Count Integer. ESRI Unique whole numbers. USGS/CSS/Core Science Analytics and Synthesis USGS-NPS Vegetation Characterization Program Coordinator mailing and physical address

Denver Federal Center, Building 810, MS 302

Denver Colorado 80225 (303) 202-4220 303-202-4219 gs-b-npsveg@usgs.gov Downloadable Data The U.S. Geological Survey and the National Park Service shall not be held liable for improper or incorrect use of the data described and/or contained herein. These data and related graphics (if available) are not legal documents and are not intended to be used as such. The information contained in these data is dynamic and may change over time. The data are not better than the original sources from which they were derived. It is the responsibility of the data user to use the data appropriately and consistent within the limitations of geospatial data in general and these data in particular. Any related graphics (if available) are intended to aid the data user in acquiring relevant data; it is not approriate to use the related graphics as data. The U.S. Geological Survey and the National Park Service gives no warranty, expressed or implied, as to the accuracy, reliability, or completeness of these data. It is strongly recommended that these data are directly acquired from an U.S. Geological Survey and National Park Service servers and not indirectly through other sources which may have changed the data in some way. Although these data have been processed successfully on a computer system at the U.S. Geological Survey, no warranty expressed or implied is made regarding the utility of the data on another system or for general or scientific purposes, nor shall the act of distribution constitute any such warranty. This disclaimer applies both to individual use of the data and aggregate use with other data. It is also strongly recommended that careful attention be paid to the contents of the metadata file associated with these data. Mention of trade names or commercial products in this metadata report does not constitute endorsement or recommendation for use by the U. S. Department of the Interior, U. S. Geological Survey and National Park Service. HTML http://www.usgs.gov/core_science_systems/csas/vip/parks/buis.html Internet Access None 20090706 20100401 USGS/CSS/Core Science Analytics and Synthesis USGS-NPS Vegetation Characterization Program Coordinator mailing and physical address

Denver Federal Center, Building 810, MS 302

Denver Colorado 80225 (303) 202-4220 303-202-4219 gs-b-npsveg@usgs.gov FGDC Biological Data Profile of the Content Standard for Digital Geospatial Metadata FGDC-STD-001.1-1999 http://www.usgs.gov/core_science_systems/csas/metadata/index.html