General Bathymetric Chart of the Oceans (GEBCO) 2019 (Polar Stereographic)

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Map preview of General Bathymetric Chart of the Oceans (GEBCO) 2019 (Polar Stereographic)Global

About this dataset

The GEBCO_2019 Grid was the first global bathymetric grid released by the General Bathymetric Chart of the Oceans (GEBCO) that had been developed through the Nippon Foundation-GEBCO Seabed 2030 Project. The GEBCO_2019 product provides global coverage, spanning 89° 59' 52.5''N, 179° 59' 52.5''W to 89° 59' 52.5''S, 179° 59' 52.5''E on a 15 arc-second grid. It consists of 43200 rows x 86400 columns, giving 3,732,480,000 data points. The data values are pixel-centre registered i.e. they refer to elevations at the centre of grid cells. The data are available to free download according to the Terms of Use provided by https://www.gebco.net/. The GEBCO_2019 Grid has been projected to WGS 84 / IBCAO Polar Stereographic (EPSG:3996) and clipped to 50° N. GEBCO Compilation Group (2021) GEBCO 2021 Grid (doi:10.5285/c6612cbe-50b3-0cff-e053-6c86abc09f8f). Map cartography and styling compiled by Christian Brogaard Pedersen (cbp@geus.dk), Geological Survey of Denmark and Greenland (GEUS).  Disclaimer: The GEBCO Grid should NOT be used for navigation or for any other purpose involving safety at sea. The GEBCO Grid is made available 'as is'. While every effort has been made to ensure reliability within the limits of present knowledge, the accuracy and completeness of The GEBCO Grid cannot be guaranteed. No responsibility can be accepted by GEBCO, IHO, IOC, or those involved in its creation or publication for any consequential loss, injury or damage arising from its use or for determining the fitness of The GEBCO Grid for any particular use. The GEBCO Grid is based on bathymetric data from many different sources of varying quality and coverage. As The GEBCO Grid is an information product created by interpolation of measured data, the resolution of The GEBCO Grid may be significantly different to that of the resolution of the underlying measured data. Purpose The purpose of the dataset is to serve as a common bathymetric background map in the ISAAFFIK Arctic Gateway portal and to support visualisation and contextualisation of marine, geological and geophysical datasets in Arctic regions. Supplemental Information The dataset is based on GEBCO 2019 and must not be used for navigation purposes. The dataset has been created as a background map for the ISAAFFIK Arctic Gateway and is published as a Web Map Tile Service (WMTS) via GEUS’ ArcGIS Server. GEUS has only carried out a reprojection and publication of the original dataset. Lineage The GEBCO_2019 Grid is released by the General Bathymetric Chart of the Oceans (GEBCO) and has been developed through the Nippon Foundation-GEBCO Seabed 2030 Project with all rights reserved. The Seabed 2030 Project aims to bring together all available bathymetric data to produce the definitive map of the world ocean floor and make it available to all. The GEBCO_2019 product provides global coverage with a continuous, global terrain model for ocean and land with a spatial resolution of 15 arc-seconds grid. It consists of 86400 rows x 43200 columns, giving 3,732,480,000 data points. The data values are pixel-center registered i.e. they refer to elevations at the center of grid cells. The grid uses as a ‘base’ Version 1 of the SRTM15+ data set (Olson et al, 2014). This data set is a fusion of land topography with measured and estimated seafloor topography. It is largely based on version 11 of SRTM30+ (Becker et al, 2009; Sandwell et al, 2014), augmented with the gridded bathymetric data sets developed by the four Seabed 2030 Regional Centers. The published data were recalculated on a cell-registered grid for use by GEBCO. The majority of the work, for the non-polar regions, was done using the 'remove-restore' procedure (Smith and Sandwell, 1997; Becker, Sandwell and Smith, 2009 and Hell and Jakobsson, 2011). This is a two-stage process of computing the difference between the new data and the 'base' grid, gridding the difference and adding this difference back to the existing base grid. The aim is to achieve a smooth transition between the 'new' and 'base' data sets with the minimum of perturbation of the existing base data set. For the polar data sets, and the adjoining North Sea, are supplied in the form of complete grids. These data sets were included using feather blending techniques from GlobalMapper software version 11.01, made available by Blue Marble Geographic.

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