Global Bathymetry Coverage
1224Tools Bathymetry provides global bathymetric contour tiles designed
for use as an overlay on existing web and mobile maps.
The dataset is derived from GEBCO 2026 and processed into transparent
XYZ PNG tiles for straightforward integration with mapping libraries
and SDKs.
Coverage at a Glance
Global Ocean Coverage
Bathymetric contour data is available globally within the supported
Web Mercator map area. Tiles are generated only where relevant contour
lines exist, so deep-ocean areas without contours in the supported
depth range may return no tile.
Data Source
The bathymetric data is derived from GEBCO 2026, using the global
15 arc-second bathymetric grid as the source dataset.
Depth Range
Contours are provided from 10 m to 200 m depth at the following levels:
10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 120, 140, 160, 180 and 200 m.
Zoom Levels
Native bathymetric contour tiles are provided from Z7 through Z13.
Higher zoom levels can be displayed by overzooming Z13 tiles, but this
does not add additional bathymetric detail.
Tile Format
Tiles are delivered as standard 256 × 256 pixel XYZ PNG tiles with
transparent backgrounds, allowing the bathymetry layer to be placed
over an existing map.
Source Resolution and Processing
The source dataset has a 15 arc-second grid resolution. Processing and
interpolation are used to produce smoother contour geometry for map
display, but they do not increase the underlying measurement accuracy
of the source data.
Known Limitations
Coastline Alignment
Bathymetric contours may not align perfectly with the coastline shown
by every basemap provider. Differences in source datasets, coastline
geometry, map scale and rendering can result in visible offsets,
particularly around small islands and complex shorelines.
Interpolation is used to smooth contour geometry for map display, but
it does not improve the positional accuracy or underlying resolution
of the source data. The contours should be treated as a bathymetric
visualization layer rather than as a precise shoreline or nautical chart.
Navigation and Safety
1224Tools Bathymetry is intended for visualization and application
development. It is not intended for navigation, collision avoidance
or other safety-critical marine operations.