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Geomorphometry is the science of quantitative terrain characterization and analysis, and has traditionally focused on the investigation of terrestrial and planetary landscapes. However, applications of marine geomorphometry have now moved beyond the simple adoption of techniques developed for terrestrial studies, driven by the rise in the acquisition of high-resolution seafloor data and by the availability of user-friendly spatial analytical tools. Considering that the seafloor represents 71% of the surface of our planet, this is an important step towards understanding the Earth in its entirety.This volume is the first one dedicated to marine applications of geomorphometry. It showcases studies addressing the five steps of geomorphometry: sampling a surface (e.g., the seafloor), generating a Digital Terrain Model (DTM) from samples, preprocessing the DTM for subsequent analyses (e.g., correcting for errors and artifacts), deriving terrain attributes and/or extracting terrain features from the DTM, and using and explaining those terrain attributes and features in a given context. Throughout these studies, authors address a range of challenges and issues associated with applying geomorphometric techniques to the complex marine environment, including issues related to spatial scale, data quality, and linking seafloor topography with physical, geological, biological, and ecological processes. As marine geomorphometry becomes increasingly recognized as a sub-discipline of geomorphometry, this volume brings together a collection of research articles that reflect the types of studies that are helping to chart the course for the future of marine geomorphometry.

geomorphology --- simulation --- accuracy --- spatial scale --- marine geomorphology --- surface roughness --- forage fish --- satellite imagery --- thalwegs --- digital elevation models (DEMs) --- Seabed 2030 --- Pacific sand lance --- Acoustic applications --- python --- Nippon Foundation/GEBCO --- Oceanic Shoals Australian Marine Park --- submarine topography --- multi beam echosounder --- sedimentation --- bedforms --- carbonate banks --- polychaete --- cold-water coral --- multiscale --- automated-mapping --- semi-automated mapping --- sediment habitats --- Atlantic Ocean --- Northwestern Australia --- random forest --- benthic habitat mapping --- paleoclimate --- submerged glacial bedforms --- seafloor --- currents --- Cenomanian–Turonian --- Multibeam bathymetry --- geomorphometry --- ArcGIS --- filter --- seabed mapping --- coral reefs --- eastern Brazilian shelf --- digital terrain analysis --- multibeam spatial resolution --- multibeam --- multibeam sonar --- Timor Sea --- seafloor geomorphometry --- shelf-slope-rise --- terrain analysis --- seafloor mapping technologies --- spatial analysis --- Canary Basin --- paleobathymetry --- Bonaparte Basin --- pockmarks --- benthic habitats --- Malin Basin --- geographic object-based image analysis --- seafloor mapping standards and protocols --- GIS --- Bering Sea --- object segmentation --- Barents Sea --- bathymetry --- carbonate mound --- underwater acoustics --- integration artefacts --- multibeam echosounder --- domes --- global bathymetry --- Random Forests --- North Sea --- spatial prediction --- Glaciated Margin --- marine geology --- image segmentation --- shelf morphology --- Alaska --- paleoceanography --- confidence --- swath geometry --- volcanoes --- deglaciation --- Cretaceous --- DEM --- habitat mapping --- marine remote sensing --- reconstruction --- acoustic-seismic profiling --- canyons