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  • WVS+ based landmass and oceanic mask derived for processing SRTM-GTopo30 DEMs. SRTM is Shuttle Radar Topography Mission; GT30/GTopo30 is Global Topographic 30 arc second DEM database, nominal 1km postings; DEM is Digital Elevation Model. The WVS_MASK grid data layer is comprised of 10800x11400 derivative vector coastline - administrative features derived based on 1:250 000 data originally from WVS+.