Gridded bathymetry of the shelf and slope environments of Midway Atoll, Hawaii, USA. Bottom coverage was achieved in depths between 0 and 200 meters. The ASCII includes multibeam bathymetry from the Simrad EM300, Simrad EM3002d, and Reson 8101 multibeam sonars collected as of December 2011 by the NOAA Coral Reef Ecosystem Division

5-m grid of bathymetric data of Kohala coast of Hawaii, Main Hawaiian Islands, USA. The ASCII grids include multibeam bathymetry from the Reson 8101 multibeam sonar collected by the National Oceanic and Atmospheric Administration (NOAA) survey launch Acoustic Habitat Investigator (AHI) in 2012 of Kohala coast of Hawaii by the NOAA Coral Reef Ecosystem Division in depths between 0 And 157.4 meters. The 5-m grid also contains synthesis bathymetric data maintained by University of Hawaii at Manoa (UH) Hawaii Mapping Research Group (HMRG).

Gridded bathymetry (5 m cell size) of the shelf and slope environments of Johnston Atoll, Pacific Remote Island Areas, Central Pacific. Almost complete bottom coverage was achieved in depths between 8 and 4100 meters. (5m grid includes data to 150m). The bathymetry dataset includes Simrad EM300, EM3002D, and Reson 8101ER multibeam data collected between Jan. 18-23, 2006.

Gridded bathymetry (20 m cell size) of the shelf and slope environments of Johnston Atoll, Pacific Remote Island Areas, Central Pacific. Almost complete bottom coverage was achieved in depths between 8 and 4100 meters. The bathymetry dataset includes Simrad EM300, EM3002D, and Reson 8101ER multibeam data collected between Jan. 18-23, 2006.

Gridded (10 m cell size) bathymetry of the slope environment of Swains Island, American Samoa, South Pacific. Almost complete bottom coverage was achieved in depths between 7 and 4800 meters (10 m grid includes data to 300 m). The bathymetry dataset includes Simrad EM300 and Reson 8101ER multibeam data collected from the 10th - 13th of February 2006.

Gridded bathymetry (20 m cell size) of the shelf and slope environments of Johnston Atoll, Pacific Remote Island Areas, Central Pacific. Almost complete bottom coverage was achieved in depths between 8 and 4100 meters. The bathymetry dataset includes Simrad EM300, EM3002D, and Reson 8101ER multibeam data collected between Jan. 18-23, 2006.

Gridded bathymetry (5 m cell size) of the shelf and slope environments of Johnston Atoll, Pacific Remote Island Areas, Central Pacific. Almost complete bottom coverage was achieved in depths between 8 and 4100 meters. (5 m grid includes data to 150 m). The bathymetry dataset includes Simrad EM300, EM3002D, and Reson 8101ER multibeam data collected between Jan. 18-23, 2006.

A 5-m resolution gridded digital elevation model (DEM) grayscale hillshade for the bathymetry (ocean depth) surrounding Tutuila Island in American Samoa compiled from ship-borne multibeam sonar surveys merged with coastal bathymetry derived from multipectral IKONOS satellite data. Almost complete bottom coverage was achieved in depths between 0 and 250 m. Data collected by the Pacific Islands Benthic Habitat Mapping Center (PIBHMC) in support of NOAA's Coral Reef Conservation Program. Not to be used for navigational purposes. For the related dataset containing numeric bathymetry values for this image layer, see http://pacioos.org/metadata/pibhmc_bathy_5m_tutuila.html

Gridded (10 m cell size) bathymetry of the slope environment of Swains Island, American Samoa, South Pacific. Almost complete bottom coverage was achieved in depths between 7 and 4800 meters (10 m grid includes data to 300 m). The bathymetry dataset includes Simrad EM300 and Reson 8101ER multibeam data collected from the 10th - 13th of February 2006.

Gridded multibeam bathymetry is integrated with bathymetry derived from multispectral IKONOS satellite data. Gridded (5 m cell size) multibeam bathymetry collected aboard NOAA Ship Hiialaka'i and R/V AHI. Bathymetry values shallower than 25 m were derived by gauging the relative attenuation of blue and green spectral radiance as a function of depth. A multiple linear regression analysis of linearized blue and green band spectral values against depth determined the variables of y-intercept, blue slope and green slope values. Variables then used in multivariate slope intercept formula to derive depth. Variables were adjusted to improve the statistical accuracy and spatial coverage of the final derived bathymetry product. Digital image processing to derive depths conducted with the ENVI 4.5 software program while data editing and integration was performed using ArcGIS 9.3. This dataset is for the shelf environment of Tutuila Island, American Samoa, USA.