OCNMS SoNAR MOSAIC
Survey HMPR-114-2004-02
A zipped extent shapefile may be obtained here (if you have difficulty, try right click and ‘save target as…’)
Projection: NAD_1983_HARN_StatePlane_Washington_South_FIPS_4602, Units Foot_US
This survey consists of two mosaics. Data is directly downloadable at the following locations:
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sidescan mosaic b |
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sidescan mosaic c |
Physical Description
These data are side scan sonar mosaics in GeoTiff format. Resolution is 1 Meter.
Projection: WGS_1984_UTM_Zone_10N, Units Meters
This side scan sonar image of the sea floor was mosaiced from data collected in August 2004 onboard the NOAA vessel Tatoosh. An EG&G 272 side scan system was used for geophysical surveying using 100Khz data. A Trimble DSM212L differential GPS was used for positioning. Navigation from the GPS were logged in Hypack version 2.6 (Coastal
Oceanographics). Isis Sonar (Triton Imaging International) was used to log the sonar packets and cable counter data. Sonar data were captured using at an 112m range scale setting.
Accuracy of the horizontal coordinates is on the order of 10-30m based on the uncertainty in position of side scan sonar towfish relative to ships gps position. Horizontal layback is more accurate than lateral offsets since any lateral offset in the towfish position (due to side currents) is unaccounted for in the layback calculations.
Ancillary Data
Several survey-specific datasets pertaining to groundtruthing, the survey track, seabed samples, etc are provided on the OCNMS Data Catalog under 114-2004-02.
Derived Data Products
Survey-specific Digital Terrain Models (DTM’s) and habitat polygons are provided on the OCNMS Data Catalog under 114-2004-02.
Other Useful Information
This page contains content copied from OCNMS’s Data Catalog. Please see their webpage for comprehensive information on OCNMS SoNAR data and data products
Also, see their Benthic Mapping webpage. Overviews of side scan sonar and multibeam sonar are available as well as a comprehensive overview of their benthic mapping program.
A comprehensive citable report pertaining to this specific survey is can be downloaded here in *.pdf format.
Questions? Commemts?
Contact Keven Bennett kbenet@u.washington.edu