appendix C. glossary 241
Reference globe.
See Generating globe.
Registration. The alignment of multiple images, such as the various flaps used to prepare a
color map.
Remote sensing. Detection and/or recording of data about an object without being in physical
contact with the object.
Representative fraction. The scale of a map expressed as a fraction or ratio that relates dis-
tance on the map to distance on the ground in the same units. Also called “natural
scale” or “fractional scale.”
RGB. The additive primary colors: red, green, and blue.
Rhumb line. A line that cuts all meridians at a constant angle. Also called a “line of constant
compass
direction,” “line
of constant bearing,” or “loxodrome.”
Sans serif. Type styles that do not have serifs.
Saturation. The “colorfulness” or vividness of a color. The closer a hue is to gray, the less
saturated it is. Also called “chroma.”
Scale. The ratio of the distances on a map, globe, model, or profile to the actual distances
they represent.
Scale factor. The ratio of the scale of a projection to that of the generating globe. The scale
factor at standard points or along standard lines is 1.0.
