gre考试阅读真题解析(B)
<p> <span word="The">The</span> <span word="term">term</span> <span word="remote">remote</span> <span word="sensing">sensing</span><span word="refers">refers</span> <span word="to">to</span> <span word="the">the</span> <span word="techniques">techniques</span> <span word="of">of</span> <span word="measurement">measurement</span> <span word="and">and</span> <span word="interpretation">interpretation</span> <span word="of">of</span> <span word="phenomena">phenomena</span> <span word="from">from</span> <span word="a">a</span> <span word="distance">distance</span>. <span word="Prior">Prior</span> <span word="to">to</span> <span word="the">the</span> <span word="mid">mid</span>-1960<span word="s">s</span> <span word="the">the</span> <span word="interpretation">interpretation</span> <span word="of">of</span> <span word="film">film</span> <span word="images">images</span> <span word="was">was</span> <span word="the">the</span> <span word="primary">primary</span> <span word="means">means</span> <span word="for">for</span> <span word="remote">remote</span> <span word="sensing">sensing</span> <span word="of">of</span> <span word="the">the</span> <span word="Earths">Earths</span> <span word="geologic">geologic</span> <span word="features">features</span>. <span word="With">With</span> <span word="the">the</span> <span word="development">development</span> <span word="of">of</span> <span word="the">the</span> <span word="optomechanical">optomechanical</span> <span word="scanner">scanner</span>, <span word="scientists">scientists</span> <span word="began">began</span> <span word="to">to</span> <span word="construct">construct</span> <span word="digital">digital</span> <span word="multispectral">multispectral</span> <span word="images">images</span> <span word="using">using</span> <span word="data">data</span> <span word="beyond">beyond</span> <span word="the">the</span> <span word="sensitivity">sensitivity</span> <span word="range">range</span> <span word="of">of</span> <span word="visible">visible</span> <span word="light">light</span> <span word="photography">photography</span>. <span word="These">These</span> <span word="images">images</span> <span word="are">are</span> <span word="constructed">constructed</span> <span word="by">by</span> <span word="mechanically">mechanically</span> <span word="aligning">aligning</span> <span word="pictorial">pictorial</span> <span word="representations">representations</span> <span word="of">of</span> <span word="such">such</span> <span word="phenomena">phenomena</span> <span word="as">as</span> <span word="the">the</span> <span word="reflection">reflection</span> <span word="of">of</span> <span word="light">light</span> <span word="waves">waves</span> <span word="outside">outside</span> <span word="the">the</span> <span word="visible">visible</span> <span word="spectrum">spectrum</span>, <span word="the">the</span> <span word="refraction">refraction</span> <span word="of">of</span> <span word="radio">radio</span> <span word="waves">waves</span>, <span word="and">and</span> <span word="the">the</span> <span word="daily">daily</span> <span word="changes">changes</span> <span word="in">in</span> <span word="temperature">temperature</span> <span word="in">in</span> <span word="areas">areas</span> <span word="on">on</span> <span word="the">the</span> <span word="Earths">Earths</span> <span word="surface">surface</span>. <span word="Digital">Digital</span> <span word="multispectral">multispectral</span> <span word="imaging">imaging</span> <span word="has">has</span> <span word="now">now</span> <span word="become">become</span> <span word="the">the</span> <span word="basic">basic</span> <span word="tool">tool</span> <span word="in">in</span> <span word="geologic">geologic</span> <span word="remote">remote</span> <span word="sensing">sensing</span> <span word="from">from</span> <span word="satellites">satellites</span>.</p><p> <span word="The">The</span> <span word="advantage">advantage</span> <span word="of">of</span> <span word="digital">digital</span> <span word="over">over</span> <span word="photographic">photographic</span> <span word="imaging">imaging</span> <span word="is">is</span> <span word="evident">evident</span>: <span word="the">the</span> <span word="resulting">resulting</span> <span word="numerical">numerical</span> <span word="data">data</span> <span word="are">are</span> <span word="precisely">precisely</span> <span word="known">known</span>, <span word="and">and</span> <span word="digital">digital</span> <span word="data">data</span> <span word="are">are</span> <span word="not">not</span> <span word="subject">subject</span> <span word="to">to</span> <span word="the">the</span> <span word="vagaries">vagaries</span> <span word="of">of</span> <span word="difficult">difficult</span>-<span word="to">to</span>-<span word="control">control</span> <span word="chemical">chemical</span> <span word="processing">processing</span>. <span word="With">With</span> <span word="digital">digital</span> <span word="processing">processing</span>, <span word="it">it</span> <span word="is">is</span> <span word="possible">possible</span> <span word="to">to</span> <span word="combine">combine</span> <span word="a">a</span> <span word="large">large</span> <span word="number">number</span> <span word="of">of</span> <span word="spectral">spectral</span> <span word="images">images</span>. <span word="The">The</span> <span word="acquisition">acquisition</span> <span word="of">of</span> <span word="the">the</span> <span word="first">first</span> <span word="multispectral">multispectral</span> <span word="digital">digital</span> <span word="data">data</span> <span word="set">set</span> <span word="from">from</span> <span word="the">the</span> <span word="multispectral">multispectral</span> <span word="scanner">scanner</span> <span word="aboard">aboard</span> <span word="the">the</span> <span word="satellite">satellite</span> <span word="Landsat">Landsat</span> 地球资源卫星) <span word="in">in</span> 1972 <span word="consequently">consequently</span> <span word="attracted">attracted</span> <span word="the">the</span> <span word="attention">attention</span> <span word="of">of</span> <span word="the">the</span> <span word="entire">entire</span> <span word="geologic">geologic</span> <span word="community">community</span>. <span word="Landsat">Landsat</span> <span word="MSS">MSS</span> <span word="data">data</span> <span word="are">are</span> <span word="now">now</span> <span word="being">being</span> <span word="applied">applied</span> <span word="to">to</span> <span word="a">a</span> <span word="variety">variety</span> <span word="of">of</span> <span word="geologic">geologic</span> <span word="problems">problems</span> <span word="that">that</span> <span word="are">are</span> <span word="difficult">difficult</span> <span word="to">to</span> <span word="solve">solve</span> <span word="by">by</span> <span word="conventional">conventional</span> <span word="methods">methods</span> <span word="alone">alone</span>. <span word="These">These</span> <span word="include">include</span> <span word="specific">specific</span> <span word="problems">problems</span> <span word="in">in</span> <span word="mineral">mineral</span> <span word="and">and</span> <span word="energy">energy</span> <span word="resource">resource</span> <span word="exploration">exploration</span> <span word="and">and</span> <span word="the">the</span> <span word="charting">charting</span> <span word="of">of</span> <span word="glaciers">glaciers</span> <span word="and">and</span> <span word="shallow">shallow</span> <span word="seas">seas</span>.</p>
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