Logically or not, people prefer colorful maps. Most textbook cartographers would approve of this, since they have long argued that it is the lightness and darkness of colors, not different color hues, that most logically represent quantitative data. Color ramps are sequences of colors that vary from light to dark, where the darkest color is used to represent the highest value range. Users may choose a group of predefined colors, known as a color ramp, or they may specify their own custom colors. ![]() ![]() Users can adjust the number of classes, the class break values that separate the classes, and the colors used to symbolize the classes. Because our ability to discriminate among colors is limited, attribute data values at the ratio or interval level are usually sorted into four to eight ordinal level categories.
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