30 arc-second grid

(20150318)

In version 20141103 of GEBCO_2014, there is a 500m (approximate) shift in latitude northwards of the data set compared to the source IBCSO grid in the region south of 60°S. This error appears to have occurred during the process to include the IBCSO grid into GEBCO.

This error has now been corrected and the area south of 60°S has now been replaced in GEBCO_2014 with a re-processed version of the IBCSO grid.

(20141103)

1. Southern Ocean (south of 60°S): International Bathymetric Chart of the Southern Ocean (IBCSO) V1
2. Arctic Ocean (north of 64°N): International Bathymetric Chart of the Arctic Ocean (IBCAO) V3
3. European Marine Observation and Data Network (EMODnet), 2013 data set
4. Baltic Sea Bathymetry Database (BSBD)
5. Waters around Australia: Australian Bathymetry and Topography Grid, June 2009
6. Bathymetry data for all ocean regions: From the Global Multi-Resolution Topography (GMRT) synthesis, provided by the Lamont-Doherty Earth Observatory at Columbia University
7. Japan Coast Guard Grid for the North Western Pacific Ocean region
8. South China Sea region: update based on sounding data extracted from Electronic Navigation Charts (ENC), provided by the East Asia Hydrographic Commission
9. North American Great Lakes: Bathymetric grids provided by the US National Oceanic and Atmospheric Administration (NOAA), National Geophysical Data Center (NGDC), U.S
10. 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”
11. Indian Ocean, region off Sumatra: Bathymetric survey carried out by HMS Scott in 2005
12. Waters off the West Coast of Africa: update based on bathymetry data from Olex
13. Northwest European Continental Shelf area: update based on bathymetry data from Olex
14. 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”)
15. Waters off Chile, update based on ENC sounding data

1. Bathymetric grids for the Black Sea region provided by Dr. John Hall, Geological Survey of Israel (retired), based on bathymetric soundings digitised from Russian hydrographic charts. Information about the source data set can be found in: Bathymetric compilations of the seas around Israel I: The Caspian and Black Seas, J.K. Hall, Geological Survey of Israel, Current Research, Vol. 13, December 2002.
2. Bathymetric grids for the Caspian Sea region provided by Dr. John Hall, Geological Survey of Israel (retired), based on bathymetric soundings digitised from Russian hydrographic charts. Information about the source data set can be found in: Bathymetric compilations of the seas around Israel I: The Caspian and Black Seas, J.K. Hall, Geological Survey of Israel, Current Research, Vol. 13, December 2002.
3. Bathymetric grid for the Weddell Sea provided by the Alfred Wegener Institute for Polar and Marine Research (AWI). The grid is based on the Bathymetric Chart of the Weddell Sea (BCWS).

The grid value at this location is taken from the Caspian Sea grid. This grid has been generated from a data set of soundings using a kriging gridding algorithm.

SID grid cells that contain a sounding(s) from the Caspian Sea source data set are coded as ‘1100’.

SID grid cells that contain a sounding(s) from the Black Sea source data set are coded as ‘1200’.

SID grid cells which contain trackline control from the Weddell Sea source data set are coded as ‘1300’.

For the Caspian Sea grid, cells that do not contain a sounding(s) are coded as ‘110’.

For the Black Sea grid, cells that do not contain a sounding(s) are coded as ‘120’.

The grid cell at this location is ‘crossed’ by trackline control information, i.e. survey track or isolated sounding, from the Weddell Sea source data set.

For the Weddell Sea grid, cells which do not contain trackline control are coded as ‘130’.

The grid value at this location is taken from the IBCSO V1 grid and is based on data from the GEBCO_08 Grid. At this location, the GEBCO_08 is based on interpolation guided by satellite-derived gravity data.