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For ERA-Interim atmospheric data the point interval on the native Gaussian grid is about 0.75 degrees. You can specify a custom grid on the data server web interface, or using the ECMWF WebAPI CDS API or using the MARS client (if you have access to it). On the web interface the default grid for ERA-Interim is lat/long, with a default resolution of 0.75x0.75 degrees (about 80km), approximating the irregular grid spacing on the native Gaussian grid.
ERA-Interim Ocean-Wave data are natively stored on the wave model’s reduced 1.0 degrees latitude/longitude grid.
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[1] When data is interpolated, all continuous fields (e.g. precipitation, temperature) are interpolated by bilinear interpolation, and discrete fields (e.g. vegetation, precipitation type, soil type) and Wave 2D spectra are interpolated by nearest-neighbour. For more information about our grids and interpolations see in this presentation https://confluence.ecmwf.int/download/attachments/55122669/intro-interpolation-2016.pdf?api=v2
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This document has been produced in the context of the Copernicus Atmosphere Monitoring Service (CAMS) and theCopernicus Climate Change Service (C3S). The activities leading to these results have been contracted by the European Centre for Medium-Range Weather Forecasts, operator of CAMS and C3S on behalf of the European Union (Delegation Agreement signed on 11/11/2014 and Contribution Agreement signed on 22/07/2021). All information in this document is provided "as is" and no guarantee or warranty is given that the information is fit for any particular purpose. The users thereof use the information at their sole risk and liability. For the avoidance of all doubt , the European Commission and the European Centre for Medium - Range Weather Forecasts have no liability in respect of this document, which is merely representing the author's view. |
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