There are more than 100 thousands seamounts, atolls and islands in the World Ocean. Investigation of its relief gives scientists big opportunities in exploration of ocean volcanism and underwater ore deposits. Known seamount catalogs do not give enough information for mathematical analysis of spatial-time regularities in seamount distribution. In order to solve this problem we have developed the algorithm of seamount recognition from bathymetric data and calculation of their morphometric characteristics. GIS-technology and bathymetric data GEBCO_2020 (http://www.gebco.net) has been used for this calculation. The study of seamounts morphometric characteristics also has applied relevance. More than half century has passed after the discovery of iron-manganese ores on the surface of underwater mountains. GIS tools have been used to analyze spatial correlation of ore-crust distribution with different morphometric characteristics of seamounts.