GMT (Generic Mapping Tools) shell script building a land/water mask grid from GSHHG shorelines with grdlandmask (land = 1, ocean = NaN) and rendering it over an ETOPO1 relief basemap for the Kuril-Kamchatka Trench area.
cartography geoscience generic-mapping-tools geophysics scientific-visualization gmt shell-scripting topography shoreline bathymetry map-projection raster-processing geospatial-visualization land-sea-mask land-mask gshhg grid-processing coastline-masking raster-masking grdlandmask
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Updated
Sep 12, 2026 - Shell