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der-stefan / OpenTopoMap

A topographic map from OpenStreetMap and SRTM data
https://opentopomap.org
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Suggestion: seabed topography #238

Open c933103 opened 4 years ago

c933103 commented 4 years ago

It would be nice if OpenTopoMap can display underwater contour lines in sea/ocean/etc., and use different shades of color for different water depth

max-dn commented 4 years ago

There are bathymetry data for the oceans in a ~450m grid from the NASA: https://visibleearth.nasa.gov/images/73963/bathymetry That is enough for shading the oceans in Zoom 0-12 (or 14?), but not for contour lines. For lakes I think there are no free elevation data (we use SRTM and the satellite didn't see under water)

c933103 commented 4 years ago

What about the GEBCO "The General Bathymetric Chart of the Oceans"? They said their grid data have been placed in public domain.

max-dn commented 4 years ago

GEBCO is a 30-arcsec-grid, so it's about 900m. I think it's enought for low zoom levels and it could be pretty,if you can design the border from river mouthes and lagoons to the sea without changing colour.