bronzová úroveň ověřený automaticky US beta
Úroveň certifikace: bronzová úroveň 25 October 2015 Co to v praxi znamená: Datová sada splňuje základní požadavky na otevřená data.
This dataset contains a unified ESRI Grid with 2x2 meter cell size representing the rugosity of two selected portions of seafloor - one area southwest of Vieques Island, and another known as El Seco that is east of the island - derived from data collected in March and April 2009. Rugosity is defined as the ratio of surface area to planar area and is used as a measure of benthic terrain complexity or "roughness". Rugosity values near 1 represent flat, smooth terrain, while higher values reflect increasing rugosity or terrain roughness. For rugosity grid interpretation, is recommended that the grid be reclassified according to standard deviation divisions. NOAA's NOS/NCCOS/CCMA Biogeography Branch, in collaboration with NOAA vessel Nancy Foster and territory, federal, and private sector partners, acquired multibeam bathymetry data around Vieques Island from 3/26/09 to 4/2/09. Data was acquired with a hull-mounted Kongsberg Simrad EM 1002 multibeam echosounder (95 kHz) for water depths greater than 75 meters, and with a moon pool flange-mounted Reson 7125 multibeam echosounder (dual frequecy, 200/400 kHz) for water depths of less than 75 meters. It was processed by a NOAA contractor using CARIS HIPS software. Data has all correctors applied (attitude, sound velocity) and has been reduced to mean lower low water (MLLW) using final approved tides and zoning from NOAA COOPS. Data is in UTM zone 20 north, datum NAD83. The processed CARIS data was used to generate a CARIS BASE surface based on swath angle. An ASCII XYZ file was exported from the BASE surface and opened in ESRI ArcMap 9.x as an XY event. Then the ArcToolbox conversion tool 'Feature to Raster' was used to generate an ESRI Grid of bathymetry. The Benthic Terrain Modeller (BTM) tool, a collection of ArcGIS terrain visualization tools developed by the Oregon State University (OSU) Department of Geosciences and the National Oceanic and Atmospheric Administration (NOAA) Coastal Services Center, was used to calculate the rugosity of that bathymetric grid. More information on the specific algorithms used can be found in the BTM's documentation. The project was conducted to meet IHO Order 1 and 2 accuracy standards, dependant on the project area and depth. All users should individually evaluate the suitability of this data according to their own needs and standards.
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National Oceanic and Atmospheric Administration, Department of Commerce Do you think this data is incorrect? Let us know
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Creative Commons CCZero Do you think this data is incorrect? Let us know
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nehraje roli, data se netýkají fyzických osob Do you think this data is incorrect? Let us know
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data jsou zálohována offsite Do you think this data is incorrect? Let us know
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http://www.data.gov/issue/?media_url=http://catalog.data.gov/dataset/noaa-tiff-image-2m-bathymetric-rugosity-us-virgin-islands-vieques-island-project-nf-09-01-2 Do you think this data is incorrect? Let us know