OCNMS SoNAR MOSAIC
Survey HMPR-115-2004-03
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 one mosaic. Data is directly downloadable at the following location:
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backscatter mosaic |
Physical Description
These data are multibeam sonar mosaics in GeoTiff format. Resolution is 1 Meter.
Projection: WGS_1984_UTM_Zone_10N, Units Meters
This multibeam backscatter sonar image of the sea floor (0-200 m water depths) was mosaiced from data collected from various mapping efforts each October from 2001-2004. Reson 8101 (240 kHz) and Reson 8125 (455kHz) multibeam echosounders were hull mounted to survey launches and deployed from the NOAA ship Rainier. Either Trimble or CSI wireless DGPS were used for launch positioning. TSS or Applanix Pos/MV were used to compensate for vessel motion. A Seabird SVP 19 plus was used to correct for sound velocity refraction. Navigation and line planning were accomplished with Hypack. Sonar packets, motion sensor, and navigation data were logged in Isis Sonar as XTF files. Backscatter was normalized using propietary software developed by the University of New Brunswick Ocean Mapping Group.
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 115-2004-03.
Derived Data Products
Survey-specific Digital Terrain Models (DTM’s), bathymetry contours, and habitat polygons are provided on the OCNMS Data Catalog under 115-2004-03.
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