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The growing use of colour in thematic map design and production, particularly in GIS based mapping environments, brings to notice a state of affairs where at least certain basic rules are required to be made to help in better, effective and efficient use of colour. One approach towards this end appears in efforts towards making the map image and input from it more compatible with the human visual processing system. This entails selection and structuring of the visual variables and the ensuing sign system of map graphics into a map image in a way in which such structuring results in an increase in the efficiency of information processing system. Many aspects of use of these visual variables from the commonly used term colour i.e. hue, value and chroma in symbolisation of thematic maps have not been investigated individually in the areas as segregation of map image’s focal realm form its peripheral realm or in other words the figure from its ground, organising perceptual groups, creating visual hierarchies by depth cues. The present paper attempts to fill certain gaps in studies related to the effects of the use of visual variables hue, value and chroma individually or in combination in map symbolisation on the preattentive stage of visual processing of information. These effects will be studied in case of area symbolised and line symbolised maps including those graduated point symbolised maps where colour dimensions are used as area fills in the blank outline symbol forms. Evidence in support of these effects will be sought from the experimental studies in design research in thematic cartography and psychology.

Functional Role of Colour in Preattentive Cognitive Processing from Thematic Map Images