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GRE阅读题目解析:遥感技术

2017-07-13 09:32:00来源:网络

  GRE阅读题目解析:遥感技术】GRE考试考什么?GRE阅读是重点。新东方在线GRE频道为大家带来GRE阅读题目解析:遥感技术,答案见下一页,希望对大家GRE备考有所帮助。更多精彩尽请关注新东方在线GRE频道!

  查看全部:GRE阅读答案解析(汇总)

  GRE阅读题目解析:遥感技术

  P4

  The term "remote sensing" refers to the techniques of measurement and interpretation of phenomena from a distance. Prior to the mid-1960's the interpretation of film images was the primary means for remote sensing of the Earth's geologic features. With the development of the optomechanical scanner, scientists began to construct digital multispectral images using data beyond the sensitivity range of visible light photography. These images are constructed by mechanically aligning pictorial representations of such phenomena as the reflection of light waves outside the visible spectrum, the refraction of radio waves, and the daily changes in temperature in areas on the Earth's surface. The advantage of digital over photographic imaging is evident: the resulting numerical data are precisely known, and digital data are not subject to the vagaries of difficult-to- control chemical processing.

  8. It can be inferred from the passage that a major disadvantage of photographic imaging in geologic mapping is that such photography

  (A) cannot be used at night

  (B) cannot focus on the details of a geologic area

  (C) must be chemically processed

  (D) is always enhanced by digital reconstruction

  (E) cannot reflect changes over extended periods of time

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