IKONOS sattelite imagery was the primary imagery source used for delineating benthic habitats in Vieques. IKONOS satellite imagery was geo-positioned, pan sharpened and deglinted by NOAA. During the digitizing process, image stretches and manipulating image contrast, brightness and color balance were performed in ArcGIS to enhance features in the processed imagery. True-color digital orthophotography obtained with an ADS40 digital sensor was the secondary imagery source used for delineating benthic habitats of Vieques. Orthophotography provided by 3001, Inc., on contract to the U.S. Army Corps of Engineers, was obtained in September and October of 2007 with a one foot ground sample distance (GSD), flight height of 8,650 feet, and 30% sidelap.
GIS topologic quality was established by executing ArcGIS extension routines that check for: overlapping polygons, multipart polygons, sliver polygons and void polygons. Additionally checks for adjacent polygons with the same habitat attributes were completed. All errors were identified and corrected. This file is believed to be logically consistent.