Introduction — The GEBCO_2014 GridThe GEBCO_2014 Grid is a continuous terrain model for ocean and land with a spatial resolution of 30 arc seconds. It is an updated version of the GEBCO_08 Grid.The GEBCO_08 Grid was first published in January 2009. The bathymetric portion of the grid was developed from a database of ship track soundings with interpolation between soundings guided by satellite-derived gravity data.Since its initial release, the GEBCO community has been working on updating this data set. Where they improve on this 'base grid', data sets generated by other methods have been included.Recognising the importance of local expertise when building a global bathymetric grid, GEBCO has been working with regional mapping groups to improve its global bathymetric model. This release of the grid benefits from collaborations with a number of regional groups. Further details can be found in Annex A and on our regional mapping web pages: www.gebco.net/regional_mapping/mapping_projects/Details on the development of the grid are given below along with information on its update history.For information on the data sets referenced in this document, please see the References and Links section and AnnexA below.