Geographic information portrayal standard within geographic information standards community in ISO 19117 is
consisted of symbol specification, symbol assignment, portrayal services, cartographic finishing rules and
implementation specification. The portrayal standard specifies a conceptual framework which includes classes,
attributes, associations and operations and is the base of implementation and sharing of the geographic information
portrayal. The portrayal standard associates geographic features with symbols. This paper starts up with the quantitative
methodology for specifying visual variables. Consequently, visual variable values of geographic information portrayal
are taken to be statistically analyzed on shape, size and color. Furthermore, a set of quantitative rules of visual variables
within the geographic information portrayal system are retrieved. Meanwhile, a visual variable model for portrayal is
founded in this paper. At last, the standard definition sharing of the portrayal is implemented with XML, which will
become model base of geographic information portrayal and visual analyses for earth observation data.
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