Imagery data for the Vegetation Mapping Inventory Project of Buck Island Reef National Monument

This reference contains the imagery data used in the completion of the baseline vegetation inventory project for the NPS park unit. Orthophotos, raw imagery, and scanned aerial photos are common files held here. U.S. Army Corps of Engineers 2006-2007 orthophotos were determined to be the most current and detailed imagery available. The imagery used in this project was a small extract from a collection of natural color GeoTIFF orthophotos that cover the islands of Puerto Rico, Culebra, Vieques, St. Thomas, St. John, and St. Croix. 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 above ground level (AGL). The imagery was capturedat 12-bit radiometric resolution and converted to 8-bit radiometric resolution during post processing. The imagery was captured with 30% side lap between all adjacent flight lines. 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 original projected coordinate system was State Plane Puerto Rico / US Virgin Islands (Zone 5200), NAD 83, GRS 80, Units Meters. These orthophotos were originally collected for the U.S. Army Corps of Engineers.

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