Chapter 3

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For point symbolization, the visual variables of hue, orientation and shape can be changed by the use of an INFO lookup table that relates nominal distinctions to different symbols; the visual variables of size and value can be used to symbolize ordinal and interval/ratio data either with a lookup table or with data from the file attribute table. For lookup tables use, one of the methods discussed in Chapter Two should be used to generate a lookup table. The AMLs discussed in this chapter generally require some of the additional information that the lookup table generating AMLs in Chapter Two provide.