Base Map / Basemap

Base Map - A map showing certain fundamental information used as a base upon which additional data of specialized nature are compiled.

[Category=Geospatial ]

Source: City of Toronto, 21 November 2013 08:56:33, http://www1.toronto.ca/wps/portal/contentonly?vgnextoid=7fdf38379bac0410VgnVCM10000071d60f89RCRD&vgnextfmt=default

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basemap - 

(1) [data analysis] A map depicting background reference information such as landforms, roads, landmarks, and political boundaries, onto which other thematic information is placed. A basemap is used for locational reference and often includes a geodetic control network as part of its structure.

(2) [data analysis] A map to which GIS data layers are registered and rescaled.

[Category=Geospatial ]

Source: esri, 29 January 2012 09:06:23, http://support.esri.com/en/knowledgebase/GISDictionary/term/abbreviation