A survey of official online sources of high-quality free-of-charge geospatial data for maritime geographic information systems applicationsApr 1, 2017·Christos Kalyvas-Kasopatidis,Athanasios Kokkos,Theodoros Tzouramanis· 0 min read Cite DOITypeJournal articlePublicationInformation Systems, 65, 36–51Last updated on Apr 1, 2017GIS Maritime Geospatial Data Survey AuthorsChristos Kalyvas-Kasopatidis (he/him)AI Security Architect · Vulnerability Intelligence ← Processing skyline queries in temporal databases Apr 3, 2017Modeling multiple modes of operation with Alloy Jan 1, 2012 →