Updating the GEBCO Grid
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1 Updating the GEBCO Grid PAULINE WEATHERALL, GEBCO DIGITAL ATLAS MANAGER, BRITISH OCEANOGRAPHIC DATA CENTRE (BODC), NATIONAL OCEANOGRAPHY CENTRE (NOC), LIVERPOOL, UK. GEBCO TSCOM and SCRUM meeting, Kuala Lumpur, Malaysia, October 2015
2 New version of the GEBCO grid released in December 2014 GEBCO_2014
3 GEBCO_2014 Grid Global terrain model at 30 arc-second intervals Update to previous grid, GEBCO_08, last published in 2010 Base grid is SRTM30_plus v5 Accompanied by a Source Identifier grid (SID) shows which grid cells are constrained by data/grids and those based on interpolation GEBCO_2014 includes new data from a number of regional mapping projects and from contributed data sets
4 GEBCO_2014 Grid New data sets contributed in the form of Pre-existing grids, e.g. IBCAO, EMODnet Soundings, e.g. ENC data sets Trackline data Methodology used to include data on top of the base grid largely depends on the data type Methods used to include pre-existing grids: mainly remove-restore procedure
5 GEBCO_2014 Grid new data sets International Bathymetric Chart of the Arctic Ocean (IBCAO) version 3 International Bathymetric Chart of the Southern Ocean (IBCSO) version 1 EMODNet Bathymetry grid 2013 release (NOAA), National Geophysical Data Center (NGDC), U.S North Atlantic Ocean, Gulf of Cadiz region: Bathymetric compilation produced under the European Science Foundation (ESF) Euromargins SWIM project Earthquake and Tsunami hazards of active faults at the South West Iberian Margin: deep structure, high-resolution imaging and paleoseismic signature Baltic Sea Bathymetry Data Base Waters around Australia: Australian Bathymetry and Topography Grid, June 2009 Bathymetry data for all ocean regions: From the Global Multi-Resolution Topography (GMRT) Data Synthesis, provided by the Lamont-Doherty Earth Observatory at Columbia University Japan Coast Guard Grid for the North Western Pacific Ocean region Indian Ocean, region off Sumatra: Bathymetric survey carried out by HMS Scott in 2005 Waters off the West Coast of Africa: update based on bathymetry data from Olex Northwest European Continental Shelf area: update based on bathymetry data from Olex South Pacific Ocean, Coral Sea region, update to correct an error in the GEBCO grid due to the inclusion of an erroneous island ( Sandy Island ) South China Sea region: update based on sounding data extracted from Electronic Navigation Charts (ENC), provided Waters off Chile, update based on ENC sounding data by the East Asia Hydrographic Commission North American Great Lakes: Bathymetric grids provided by the US National Oceanic and Atmospheric Administration
6 GEBCO_2014 Grid Coverage of GEBCO_2014 Source Identifier grid grid cells based on interpolation (where identified) are shown in white
7 GEBCO_2014 Grid Coverage of news data sets included in GEBCO_2014
8 GEBCO_2014 EMODnet grid
9 GEBCO_2014 GEBCO_08 grid
10 GEBCO_2014 GEBCO_2014
11 GEBCO_2014 Grid Example comparison between previous grid GEBCO_08 and GEBCO_2014 Further comparison imagery and data set documentation available on GEBCO s web site: n_ /
12 Making GEBCO s grids available GEBCO s gridded data sets are available to download from:
13 Making GEBCO s grids available Data accessible for user-defined areas or global grid files Export formats: One dimensional (1D) netcdf grid (aimed for use with GDA) CF compliant netcdf (2D) Esri ASCII raster Data GeoTiff
14 Other GEBCO-related work at BODC Development of a contour data set for the GEBCO_2014 Grid Web Map Service (WMS) update work WMS development work for delivering metadata for the SID grid Statistics on data downloads and access to GEBCO s web site included in: gebco_report_october_2015.pdf
15 Thank you
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