ある物体が検出されるには、伝導性に不連続性があり進行してきた波を反射する必要がある。レーダー波（マイクロ波またはラジオ帯域）は金属物によって効率よく反射されるが、雨滴や岩といった非金属は反射を起こしにくく、物質によってはまったく反射が検出できず、レーダーでは見つからない場合がある。エアロゾルや分子のような極めて小さな対象は特に不得手である。
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[NARRATOR] Introducing to this 'inherent variability,' there was something else to take into consideration. [GARY SHIGENAKA] "And another issue that manufactured it one of a kind at time of your spill was The point that it definitely was nevertheless recovering from An additional big disturbance that occurred accurately 25 yrs ahead of the Exxon Valdez
As a result of the disaster, NOAA place added assets toward spill reaction, such as developing a hazardous product reaction division to deliver scientific abilities for the duration of a spill, putting scientific assistance coordinators around the nation, and developing strategies to assess and design oil trajectories.
[NARRATOR] The exception was a checking program of orcas that were ongoing in the Audio for a minimum of 5 years before the spill. [GARY SHIGENAKA] "That pre-spill information and facts showed that a little something in 1989 considerably decreased the quantities of orcas in two groups that frequents Prince William Seem and that's something which's mostly unheard of in commonly stable populations of huge marine get more info mammals. After which you can the continuing checking once the spill has proven a very disturbing recovery pattern.
I don't Assume any individual truly predicted that following 25 decades and we don't thoroughly understand why. I imagine that's something which'll be important to try out to figure out for the future."
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レーザーの光束は通常極めて絞り込まれ、細いビームとなっているので、極めて高い光学的解像度を以て大気の特徴をマップすることができる。更に、多くの化学物質において、可視光はマイクロ波に比べ強く相互作用するので、それらを検出する感度が高い。各種波長のレーザーを上手に組み合わせれば、散乱光の強度と波長との関係から、大気の組成を離れた所から調べることができる。
So we could say they were correctly recovered. So you put that into a clear up context therefore you try out to determine exactly what the tradeoffs are. Will you be ready to take that kind of a price to receive extra oil out with the atmosphere, and that's something which occurs constantly concerning in creating your choices for oil spill cleanse up strategies." [NARRATOR] And then there are still things that science won't be able to still make clear. I requested Gary what's most astonishing currently concerning this spill right after so a few years.
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この他、航空レーザーもありますが非常に高額であり操縦者も必要とするので、専門の会社に測量を依頼してデータを購入する方法が一般的です。