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DEFINITION: A map showing certain fundamental information, on
which is compiled additional data of specialized nature. Also a map to which all
other maps and GIS map layers are registered and re-scaled. [From: http://fwie.fw.vt.edu/rhgiles/appendices/glossb.htm]
- Coastlines
- Relief Data - Bathymetry (of the seafloor) and topography (of the land)
- Contours - Depth displayed
as lines (hand- or computer drawn) of equal altitude (land; topography) or
equal depth (sea; bathymetry)
- Grids - Orthogonal arrays of relief
values, arranged in rows and columns that reflect geographic coordinates or
projected coordinate systems
- General Images - Graphical representations of global relief data or
pseudo-color representations of other remotely-sensed geophysical data
- Gazetteers - Structured lists of land and sea feature names
- Ancillary Data - Area of Interest polygons; land and sea masks; graticules
- Where Else to Look: Human Environment
(borders and other geopolitical boundary features)
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