NOS SeaBeam
The original data sets were extracted from the NOS GEODAS database CD ROMs, available from the National Geophysical Data Center (NGDC). The source file is a subset of SEABEAM file from the NOS bathymetric soundings. SEABEAM general instrument is 16 beams, 12 kHz. 5 Beams of actual data were extracted from each return. Sampling rate varies from 10 to 30 seconds along the track. The projection is geographic, the units are decimal degrees, and Datum is North American Datum 1983. The soundings are in meters from Mean Lower Low Water, and the horizontal positioning accuracy is variable, but assumed to be within 20 meters for GPS and within 50 meters for LoranC.
Main Hawaiian Islands
Download map: MainHI_NOSSeaBeam (PDF ~17Mb; JPG ~6Mb )
Kauai
This data is not available here.
Oahu
This data is not available here.
Maui
This data is not available here.
Hawaii (Big Island)
Download map: Hawaii_NOSSeaBeam (PDF ~10Mb; JPG ~7Mb )
