The Marine Geoscience Data System and the Global Multi-Resolution

Topography Synthesis: Online Resources for

Exploring Ocean Mapping DataJohn Morton, Vicki Ferrini*, Suzanne Carbotte,

and the MGDS Team

MGDS Tools & Services• GMRT Synthesis• GeoMapApp• Marine-Geo Digital Library

Specialist

Non-specialist

GMRT Synthesis: Overview• Open-access global elevation product

– Focus on bathymetry• Support specialists & non-specialists• Multi-resolutional synthesis

– GEBCO_2014 + MBES + land + grids– MBES at full-native resolution (100m+)

• Tiled Global Compilation– Images, grids, mask– Mercator, South Polar, North Polar– 2 scheduled releases / year

(~80 cruises)• Attribution to data contributors• Access to source data• Multiple Apps for Access

Multibeam Data* Preparation• Bad navigation• Noisy outer beams• Attitude problems• Bad soundings• Instrument problems• Bad weather• Sound velocity• Attitude Offsets• Slow speed in turns• Grid weighting • Resolution (100, 50, 25 m)

*LDEO team processes swath files (public domain, primarily US Academic)

• Compilation began in 1992• Includes data from 1980 - present• Current version of GMRT (v.3.1, Nov. 2015)

• 875 Cruises• > 4.4 Million trackline km• > 175K processed swath files• 28.6 Million km2 (~8% ocean)

Multibeam Data in GMRT

GMRT Access• GMRT MapTool• Web Services • GeoMapApp• Earth Observer• Partner Products

(MB component only)– Google Ocean Basemap– Esri Ocean Basemap– GEBCO 2014

http://gmrt.marine-geo.org

GMRT MapTool

http://www.marine-geo.org/tools/GMRTMapTool/

GMRT – Web Services• Web Map Services

– Mercator • masked, un-masked, track-lines

– South Polar • masked, un-masked, track-lines

• RESTful Web Services– GridServer– ImageServer– PointServer– ProfileServer– Attribution Service

• Desktop Java Application• Core capabilities

– Grids/images, tabular data (plot, interrogate, interact)

– Load data, save sessions• Access to 1000s of datasets

– Bathymetry, Bottom Photos, Sidescan & more!

– Links to original data sources• Custom Portals

– IODP, Seismic, Trackline geophysics, Photos

GeoMapApp

GeoMapApp

Grid Functionality

Marine-Geo Digital Library• Interactive Digital Library• > 670,000 files from > 2,600 programs • Field data + Derived Products

– Bathymetry, Photos, Interpretations– Ships, submersibles, towed platforms

• Links to Publications• Data Portals• Data DOIs• Analytics

Marine-Geo Search• Map/Text search • Multiple parameters

– Device, Data Type, Investigator, Date, Spatial Extent, Platform, Publication, etc

Select/Download

Next Steps…• GMRT

– More content!– SP rebuild (underway)– NP rebuild/web services– Derivative products (e.g. Rugosity)

• GeoMapApp– Enable functionality in web-interface

• Marine-Geo Digital Library– Enhance map interfaces– Display/access of data file content