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1 Base Maps, Data, or Layers

Spatial data sets that provide the background upon which more specific thematic data is overlaid and analyzed. As inputs into a GIS, the term base map is usually applied to those sources of information about relatively permanent features including topography, soil data, geology, cadastral divisions, and political divisions. Within a GIS database, such information may become part of a land base to which other information is indexed and referenced.

2 Bathymetry

Bathymetry is the study of underwater depth of the third dimension of lake or ocean floors. In other words, bathymetry is the underwater equivalent to hypsometry.

3 Bearing

horizontal angle at a point relative to a specified direction

4 Bookmark

[ESRI software] A shortcut that saves the current map view, including extents, active layers, and styles for future use.

5 Boundary

set that represents the limit of an entity

6 Buffer

geometric object that contains all direct positions whose distance from a specified geometric object is less than or equal to a given distance