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Selection
Before you begin the generalisation process, a selection of available information must be made that is consistent with the purpose of the map. Thus, the selection process of generalisation can be defined as the "intellectual process of deciding which information will be necessary to carry out the purpose of the map successfully". No modification of the information is required in selection. The choice is either to depict secondary roads or not to depict secondary roads, to name or not name by lettering all cities below 50 000 population, etc. Selection is a critical process and may involve working very closely with the map user.
This example will show you the selection done on the federal map by Swisstopo (external link): on
the 1:50 000 map, the small public highways are depicted. Whereas on the 1:500 000 they are not. This is done
in order to increase the effectiveness of the communication by counteracting the undesirable consequences of
reduction.
Selection example, source: national maps, reproduced with the permission of swisstopo (BA057224), www.swisstopo.ch (Swisstopo) |
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