PowerPointPrsentation

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Martin Klenke Hans Werner Schenke
Towards a Circum-Antarctic Bathymetric Data
Infrastructure
Alfred Wegener Institute for Polar and Marine
Research Bremerhaven - Germany Bathymetry and
Geodesy Group
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Outline

• Another SO bathymetry, what for ?
• Where are we now ?
• A local SO data set AWI BCWS
• Is there a need / will it be used ?
• Project workplan / status
• Technical issues
• Organisational framework
• Final remarks

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Antarctic bathymetry, what for ?

• Georeferencing and regionalization of marine
  observations
• Studying marine processes (fluxes,
  sedimentation, etc.)
• Supplying DEMs for ocean circulation modeling
• Studying physiography and tectonics
• Making reliable nautical charts for safe
  navigation
• . . .

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Actual knowledge about antarctic bathymetry
global data sets
Main global sounding database IHO DCDB
co-located with the US NGDC

• Raster contour data sets
• ETOPO 5 grid (bathymetry based on NAVOCEANOs
  DBDB5)
• ETOPO 2 grid (bathymetry based on altimetry,
  DBDB-V, DBDB 5, IBCAO)
• Smith Sandwell 2 minute grids (based on
  satellite altimetry and ship soundings)
• GEBCO Digital Atlas contours (based on the IHO
  DCDB database)

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ETOPO2 sources
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GEODAS query tracklines with bathymetric
information in the Southern Ocean
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Example for a local bathymetry the AWI
Bathymetric Charts of the Weddell Sea
Digital data - R/V Polarstern single and
multibeam data - IHO DCDB data - GEBCO GDA
data National Hydrographic Offices (Charts) -
Argentina - South Africa - SU/Russia - UK
- US Scientific Organizations - AWI - Norsk
Polar Institutt - Sevmorgeologia St. Petersburg
Input spot soundings, contour lines (digital
and analogue), predicted bathymetry Processing s
emi-automatic (human interpretation and computer
aided interpolation ) Products contour set,
grids (2.5 km / 1 km), printed map series
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BCWS grid / GTOPO30 merge


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IBCAO Arctic Ocean bathymetry
IBCAO website at NGDC http//www.ngdc.noaa.gov/m
gg/bathymetry/arctic/arctic.html
Average of unique users per week May 2000 May
2001 1010 (David Divins, NGDC)
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Project work plan

• International data query and collection, in
  parallel construction of the project data base.
• Transfer of
• all existing single beam data, multibeam data and
  respective metadata,
• existing bathymetric charts (contour lines and
  spot soundings),
• existing marine gravity data, and
• free-air gravity models from satellite altimetry
  to the data base.
• Data quality control, analysis, description and
  editing (if necessary).
• Development and test of data fusion techniques to
  merge the heterogeneous data.
• Generation of final products DTMs, contour set,
  metadata infrastructure.
• Creation of a bathymetric map series at scale 11
  Million.
• Provision of all data products via a web
  interface with links to the GIS and RDBMS.

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Technical issues
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Organizational framework

• Synchronisation with existing global bathymetric
  data sets (GDA, ETOPO, etc.) ?
• How to integrate in other Antarctic data
  infrastructures (ADD, Cyber-Atlas, etc.) ?

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Dr. Martin Klenke Alfred Wegener Institute for
Polar and Marine Research P.O. Box 12 01
61 D-27515 Bremerhaven Germany
Contact
E-Mail mklenke_at_awi-bremerhaven.de WWW
http//www.awi-bremerhaven.de/GEO/Bathymetry/
Tel. [phone] Fax 49 (0)
471-4831 1149
Eltanin Impact Area Bellinghausen Sea
Southern Ocean (Source R/V Polarstern multibeam
data)