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Global Multi-Resolution Topography (GMRT) - Making bathymetry data openly accessible

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Vicki Ferrini
Vicki Ferrini

The Global Multi-Resolution Topography (GMRT) synthesis is a multi-resolutional compilation of edited multibeam sonar data collected by scientists and institutions worldwide, merged into a single continuously updated compilation of global elevation data. The GMRT Synthesis, which began in 1992, brings together a variety of elevation sources, which are delivered as multi-resolutional images and grids of land and ocean elevations.

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Global Multi-Resolution Topography (GMRT) Synthesis Vicki Ferrini, Suzanne Carbotte, William Ryan, Suzanne O’Hara Lamont-Doherty Earth Observatory Columbia University
MBES Data Workflow
Increasing Emphasis on Open Data Access • • • • • • Acquisition Costs Spatial & Temporal Change Scientific Reproducibility Federal Data Policy Compliance New Possibilities Big Data
Global Multi-Resolution Topography (GMRT) - Making bathymetry data openly accessible
MBES Data Available via NGDC
How can we make data accessible to non-specialists? ?? Swath files & grids Broad access to content for: • Interdisciplinary research • Citizen scientists • Educators
GMRT Synthesis - Dynamically maintained - Multi-resolution - Images, grids, mask - 9 resolution levels to 100 m* - Full attribution to sources & contributing scientists - Source Data Includes: - ASTER, NED, GEBCO_08, IBCAO, BEDMAP *50 -Contributed grids m in places
GMRT Overview Global coverage 100m swath data and grids User experiences seamless transition between resolutions based on chosen zoom level
GMRT History • 1992 – Ridge Multibeam Synthesis Project • 2003 – Expanded to include US-funded data from Southern Ocean • 2004 – present -Expanded to include public domain data from throughout global oceans http://gmrt.marine-geo.org GMRTv2.4 - 687cruises (April 2013) ongoing growth by ~ 80 cruises/yr
GMRT Components Global & Regional Grids (>= 500 m res.) e.g. GEBCO_08, IBCAO Contributed Grids (< 500 m res.) LDEO 100-m compilation* (raw & processed swath files in public domain) MB files metadata *LDEO team performs QC of ping files
GMRT Evolution – MBES Content + 44 regional contributed grids from international sources
GMRT v1.x
GMRT v2.4
MBES Source Data in GMRTv2.4 • Kongsberg** • EM120, EM122, EM300, EM302, EM1002, EM3000 • SeaBeam • Classic, 2000, 2100, 2101, 2102, 2112 • Hydrosweep • DS, DS2 **Majority of ships US Academic Research Fleet now carry Kongsberg MBES
# cruises MBES Source Data in GMRT v2.4 year of cruise
GMRT: MB Data Preparation • • • • • • • • • Bad navigation Noisy outer beams Attitude problems Bad soundings Instrument problems Bad weather Sound velocity Slow speed in turns Quality assessment for grid weighting and resolution
GMRT MB Prep Workflow MB files Preprocess & Auto-QA Problems Manual assessment Reprocess Address Problems *MB System* Problems No problems Approval Phase Approved Add to tile set
Tools for Quality Assessment *Interface can be used to QA/QC swath data & gridded data
Tools for Quality Assessment
GMRT: Access • Images & gridded data • Desktop Apps • GeoMapApp • Virtual Ocean • Web App • CM&G • Web Map Service • Images & Mask • iPad/iPhone • Earth Observer
GMRT : Attribution
GMRT : Attribution
GMRT: Attribution & Source Data Access
GMRT : Attribution
Complementary Fleet-Wide Efforts GOAL: Well-documented high-quality publicly available data MAC 2011 R2R 2009 GMRT 1992
MBES Raw Data Preservation • • • • 680 file sets 253,681 files ~ 6.1 TB from 601 cruises as of Apr 15, 2013
Broadening Access through Collaboration • • • • GEBCO Google Microsoft ESRI
To Learn More about GMRT… Ryan et al., 2009 http://gmrt.marine-geo.org
Questions? ferrini@ldeo.columbia.edu

More Related Content

Global Multi-Resolution Topography (GMRT) - Making bathymetry data openly accessible

  • 1. Global Multi-Resolution Topography (GMRT) Synthesis Vicki Ferrini, Suzanne Carbotte, William Ryan, Suzanne O’Hara Lamont-Doherty Earth Observatory Columbia University
  • 3. Increasing Emphasis on Open Data Access • • • • • • Acquisition Costs Spatial & Temporal Change Scientific Reproducibility Federal Data Policy Compliance New Possibilities Big Data
  • 6. How can we make data accessible to non-specialists? ?? Swath files & grids Broad access to content for: • Interdisciplinary research • Citizen scientists • Educators
  • 7. GMRT Synthesis - Dynamically maintained - Multi-resolution - Images, grids, mask - 9 resolution levels to 100 m* - Full attribution to sources & contributing scientists - Source Data Includes: - ASTER, NED, GEBCO_08, IBCAO, BEDMAP *50 -Contributed grids m in places
  • 8. GMRT Overview Global coverage 100m swath data and grids User experiences seamless transition between resolutions based on chosen zoom level
  • 9. GMRT History • 1992 – Ridge Multibeam Synthesis Project • 2003 – Expanded to include US-funded data from Southern Ocean • 2004 – present -Expanded to include public domain data from throughout global oceans http://gmrt.marine-geo.org GMRTv2.4 - 687cruises (April 2013) ongoing growth by ~ 80 cruises/yr
  • 10. GMRT Components Global & Regional Grids (>= 500 m res.) e.g. GEBCO_08, IBCAO Contributed Grids (< 500 m res.) LDEO 100-m compilation* (raw & processed swath files in public domain) MB files metadata *LDEO team performs QC of ping files
  • 11. GMRT Evolution – MBES Content + 44 regional contributed grids from international sources
  • 14. MBES Source Data in GMRTv2.4 • Kongsberg** • EM120, EM122, EM300, EM302, EM1002, EM3000 • SeaBeam • Classic, 2000, 2100, 2101, 2102, 2112 • Hydrosweep • DS, DS2 **Majority of ships US Academic Research Fleet now carry Kongsberg MBES
  • 15. # cruises MBES Source Data in GMRT v2.4 year of cruise
  • 16. GMRT: MB Data Preparation • • • • • • • • • Bad navigation Noisy outer beams Attitude problems Bad soundings Instrument problems Bad weather Sound velocity Slow speed in turns Quality assessment for grid weighting and resolution
  • 17. GMRT MB Prep Workflow MB files Preprocess & Auto-QA Problems Manual assessment Reprocess Address Problems *MB System* Problems No problems Approval Phase Approved Add to tile set
  • 18. Tools for Quality Assessment *Interface can be used to QA/QC swath data & gridded data
  • 19. Tools for Quality Assessment
  • 20. GMRT: Access • Images & gridded data • Desktop Apps • GeoMapApp • Virtual Ocean • Web App • CM&G • Web Map Service • Images & Mask • iPad/iPhone • Earth Observer
  • 23. GMRT: Attribution & Source Data Access
  • 25. Complementary Fleet-Wide Efforts GOAL: Well-documented high-quality publicly available data MAC 2011 R2R 2009 GMRT 1992
  • 26. MBES Raw Data Preservation • • • • 680 file sets 253,681 files ~ 6.1 TB from 601 cruises as of Apr 15, 2013
  • 28. To Learn More about GMRT… Ryan et al., 2009 http://gmrt.marine-geo.org

Editor's Notes

  1. Seafloor bathy data are needed for a broad spectrum of studies. But coverage is exceedingly sparse and all multibeam are of high value
  2. Seafloor bathy data are needed for a broad spectrum of studies. But coverage is exceedingly sparse and all multibeam are of high value
  3. Through geomapapp the original data source can be identified. Here by clicking on the Italian data set Bouvet-Ligi, the location of the survey is highlighted in enclosed box on map view