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Update docs for GEBCO 2025 (#137)
* Update changelog and rst file * Update day
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‎docs/changes.rst‎

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Changelog
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---------
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2025-08-13
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^^^^^^^^^^
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- ``earth_gebco``: Update dataset source from version 2024 to 2025.[`GEBCO Compilation Group, 2025, GEBCO 2025 Grid <https://www.gebco.net/data_and_products/gridded_bathymetry_data/>`_].
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- ``earth_gebcosi``: Update dataset source from version 2024 to 2025.[`GEBCO Compilation Group, 2025, GEBCO 2025 Grid <https://www.gebco.net/data_and_products/gridded_bathymetry_data/>`_].
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2025-05-02
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^^^^^^^^^^
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‎docs/earth-gebco.rst‎

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==== ================= === ======= ================================================
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Code Dimensions Reg Size Description
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==== ================= === ======= ================================================
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01d 360 x 180 g,p 103 KB 1 arc degree global relief (GEBCO 2024 @ 315 km)
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30m 720 x 360 g,p 350 KB 30 arc minute global relief (GEBCO 2024 @ 157 km)
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20m 1080 x 540 g,p 729 KB 20 arc minute global relief (GEBCO 2024 @ 105 km)
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15m 1440 x 720 g,p 1.3 MB 15 arc minute global relief (GEBCO 2024 @ 79 km)
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10m 2160 x 1080 g,p 2.7 MB 10 arc minute global relief (GEBCO 2024 @ 52 km)
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06m 3600 x 1800 g,p 7.1 MB 6 arc minute global relief (GEBCO 2024 @ 32 km)
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05m 4320 x 2160 g,p 10 MB 5 arc minute global relief (GEBCO 2024 @ 26 km)
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04m 5400 x 2700 g,p 16 MB 4 arc minute global relief (GEBCO 2024 @ 21 km)
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03m 7200 x 3600 g,p 27 MB 3 arc minute global relief (GEBCO 2024 @ 16 km)
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02m 10800 x 5400 g,p 58 MB 2 arc minute global relief (GEBCO 2024 @ 11 km)
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01m 21600 x 10800 g,p 211 MB 1 arc minute global relief (GEBCO 2024 @ 1.9 km)
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30s 43200 x 21600 g,p 752 MB 30 arc second global relief (GEBCO 2024 @ 2.6 km)
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15s 86400 x 43200 p 2.6 GB 15 arc second global relief (GEBCO 2024 original)
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01d 360 x 180 g,p 103 KB 1 arc degree global relief (GEBCO 2025 @ 315 km)
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30m 720 x 360 g,p 350 KB 30 arc minute global relief (GEBCO 2025 @ 157 km)
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20m 1080 x 540 g,p 729 KB 20 arc minute global relief (GEBCO 2025 @ 105 km)
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15m 1440 x 720 g,p 1.3 MB 15 arc minute global relief (GEBCO 2025 @ 79 km)
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10m 2160 x 1080 g,p 2.7 MB 10 arc minute global relief (GEBCO 2025 @ 52 km)
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06m 3600 x 1800 g,p 7.1 MB 6 arc minute global relief (GEBCO 2025 @ 32 km)
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05m 4320 x 2160 g,p 10 MB 5 arc minute global relief (GEBCO 2025 @ 26 km)
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04m 5400 x 2700 g,p 16 MB 4 arc minute global relief (GEBCO 2025 @ 21 km)
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03m 7200 x 3600 g,p 27 MB 3 arc minute global relief (GEBCO 2025 @ 16 km)
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02m 10800 x 5400 g,p 58 MB 2 arc minute global relief (GEBCO 2025 @ 11 km)
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01m 21600 x 10800 g,p 211 MB 1 arc minute global relief (GEBCO 2025 @ 1.9 km)
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30s 43200 x 21600 g,p 752 MB 30 arc second global relief (GEBCO 2025 @ 2.6 km)
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15s 86400 x 43200 p 2.6 GB 15 arc second global relief (GEBCO 2025 original)
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03s 432000 x 216000 g 6.8 GB 3 arc second global relief (SRTM3S original)
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01s 1296000 x 432000 g 41 GB 1 arc second global relief (SRTM1S original)
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==== ================= === ======= ================================================
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Technical Information
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~~~~~~~~~~~~~~~~~~~~~
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As you see, the 30s and lower resolutions are all derivatives of GEBCO's 2024 15 arc second grids
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(GEBCO_Compilation_Group, 2024). We have downsampled it via Cartesian Gaussian filtering to prevent
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As you see, the 30s and lower resolutions are all derivatives of GEBCO's 2025 15 arc second grids
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(GEBCO_Compilation_Group, 2025). We have downsampled it via Cartesian Gaussian filtering to prevent
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aliasing while preserving the latitude-dependent resolution in the original 15 arc sec grid.
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The full (6 sigma) filter-widths are indicated in parenthesis. The 3 and 1 arc second data
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are the SRTM 1x1 degree tiles from NASA. **Note**: The 3 and 1 arc second grids only extend
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tiles to fill in the missing ocean values. If you just want the original land-only SRTM tiles
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you may use the special names @srtm_relief_03s or @srtm_relief_01s instead. Almost all grids
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are available in both gridline- and pixel-registered formats except the original pixel-registered
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GEBCO 2024 (here called @earth_gebco_15s) and the gridline-registered SRTM tiles.
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GEBCO 2025 (here called @earth_gebco_15s) and the gridline-registered SRTM tiles.
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Data References
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~~~~~~~~~~~~~~~
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#. GEBCO Compilation Group (2024) GEBCO 2024 Grid (https://doi.org/10.5285/1c44ce99-0a0d-5f4f-e063-7086abc0ea0f)
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#. GEBCO Compilation Group (2025) GEBCO 2025 Grid (https://doi.org/10.5285/37c52e96-24ea-67ce-e063-7086abc05f29)
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#. SRTMGL3 tiles: [https://lpdaac.usgs.gov/products/srtmgl3v003].
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#. SRTMGL1 tiles: [https://lpdaac.usgs.gov/products/srtmgl1v003].

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