overlay - The process of superimposing two or more maps, through registration to a common co-ordinate system, such that the resultant maps contain the data from both maps for selected features. Although the term overlay can be applied to paper based maps, more often it applies to the use of digital data, nevertheless, the principal is the same.
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дс тдрлими цюлютдажкию дроемжки аиакиохдйис лидр
http://www.geo.ed.ac.uk/agidexe/term;
