OCNMS Raster Digital Terrain Models (DTMs)
Survey HMPR-113-2004-01
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
These data consist of four tiles. Note that area d is not represented. Data is directly downloadable at the following locations.
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digital terrain model p |
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digital terrain model q |
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digital terrain model r |
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digital terrain model t |
Physical Description
These data are ASCII Grid (*.asc) format. Resolution is 10 Meters.
Projection: WGS_1984_UTM_Zone_10N, Units Meters
Vertical Datum: MLLW, Units Meters
In 2002 and 2003, hydrographic survey data were collected using Reson 8101 multibeam echosounders outfit to 9.8m survey launches. Bathymetry data were cleaned of anomalies using Caris HIPS software, creating BASE (Bathymetry Associated with Statistical Error) surfaces for each of three survey blocks with the CUBE (Combined Uncertainty Bathymetric Estimator) method (Calder and Mayer 2003). Accepted XYZ values from the CUBE surface were ultimately converted to ESRI Arc ascii grid format.
Horizontal Accuracy:
The data meet NOAA NOS hydrographic specifications which can be found at http://chartmaker.ncd.noaa.gov/hsd/specs/specs.htm. NOS specification for hydrographic positioning is that the toal error in position of soundings, dangers, and all other significant features, at the 95 percent confidence level, will not exceed 5 meters +5 percent of the depth. This accuracy requirement is independent of survey scale.
Vertical Accuracy:
See NOS hydrographic stanards http://chartmaker.ncd.noaa.gov/hsd/specs/CHAPTER5.htm.
Related Data Products
Survey specific habitat polygons are provided on the OCNMS Data Catalog under 113-2004-01. Also, see OCNMS SoNAR Mosaic HMPR-113-2004-01.
Other Useful Information
Import of ASCII Grid (*.asc) using your particular GIS software’s import utilities will be required.
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