Even once all the coastal areas are covered with high-resolution relief shading, enhancements to relief shading will continue, Cirillo says. “We plan to augment the data continuously with future updates,” he explains. One thing that shaded-relief bathymetry cannot show is bottom composition. “As the name implies, it is a virtual three-dimensional relief map, so it only depicts the changes in elevation of the ocean floor, albeit in remarkable detail,” Kaste says. It won’t tell you if the bottom is hard limestone or soft mud, but relief patterns can lead to inferences. For example, an abrupt, isolated high spot is likely composed of a hard substance such as rock or coral — structure that will certainly attract fish.