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中古世纪的新郎订婚时,把婚戒先在新娘左手的三只手指上轮流戴,以象征圣父、圣子和圣灵三位一体。
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Passive systems beam artificially produced energy to a target and record the reflected component.
Active systems detect only energy emanating naturally from an object, such as reflected sunlight or thermal infrared emissions.
“Image-oriented” capitalizes on the pictorial aspects of the data and utilizes analysis methods which rely heavily on the generation of an image.
“Numerical-oriented” results directly from the development of the computer and because it emphasizes the quantitative aspects of the data, treating the data abstractly as a collection of measurement.
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