Deployed to https://patrick-morrison.github.io/submerged_landscapes_world_map/
This map shows submerged lands all over the world. It highlights :
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-130m: the lowest sea level during the last ice age (22ka),
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-30m: the deepest most scientific divers can work,
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and 0m - present day land.
The image was generated by styling all the GEBCO world bathymetry in QGIS. Similar steps can be found here.
They were then processed into a TMS layer using gdal2tiles, and the pngs optimised:
gdal2tiles.py --zoom=0-7 submerged_world_map_compressed.tif output_folder
find . -type f -iname "*.png" -exec optipng -nb -nc {} \;
Some changes were made to the leaflet file as well, to add styling and a legend.