Shrnutí

Popis

This dataset contains a unified GeoTiff with 2x2 meter cell size representing the slope (in degrees) of the 2011 biogeographic assessment of the US Virgin Islands, derived from data collected in March 2011. NOAA's NOS/NCCOS/CCMA Biogeography Branch, in collaboration with NOAA vessel Nancy Foster, as well as federal, university, and private sector partners, acquired multibeam bathymetry data off of St. Thomas and St. John, USVI from 03/28/2011 to 04/14/2011. Data was acquired with a hull-mounted Reson 7125 multibeam echosounder (400 kHz). It was processed by a NOAA contractor using CARIS HIPS software. Attitude and sound velocity correctors applied to the data. Verified tides were not applied to the data, leaving the depth values referenced to the ellipsoid. The imagery is projected in the UTM Zone 20 north, NAD83 datum. The processed CARIS data was used to generate a CARIS BASE surface based on swath angle. The CARIS Export option "BASE Surface to Image" was then used to create a GeoTiff of the priority areas. Slope was derived from this surface using the slope calculator, a function of ESRI’s Spatial Analyst extension.