The technique, which uses imagery captured by the Landsat program, works specifically to determine ocean depth, or bathymetry ... for refined shallow-water maps, but producing them is a ...

Ocean depth is divided into zones: littoral, bathyal, abyssal and hadal. The deepest part of the ocean, the hadal zone, is anywhere deeper than six kilometres. What is the average depth of the ocean?

NGM MAPS. Source: “spatial and temporal changes in cumulative human impacts on the world’s ocean,” Ben S. Halpern and others, Nature Communications; UNEP-WCMC, World Database on Protected ...