How do plants use sunlight

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Satellite Eyes by Virginia Venturini University
of Cincinnati Program STEP
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TRIVIA (?)
Why are plants green in spring/summer and brown
in fall?
Take 3 min to think about this question - Attempt
an answer
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Photosynthesis

• Objectives
• The students will describe how chlorophyll uses
  different lights for photosynthesis.
• The student will analyze absorbed and reflected
  lights by looking at satellite images sensed with
  green, red and near infrared sensors.

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Photosynthesis

• We know that
• Chlorophyll pigments absorb sunlight in order to
  get energy.
• Let us see
• Do they absorb all of the sunlight?

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How do plants use sunlight?
Chlorophyll pigments absorb 90 of the Red and
Blue lights or energy. Reflect back about 20
Green light Reason why we see them green!
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What can satellites see?
Satellite electromagnetic sensors let us see
beyond the visible...
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How do imaging satellites work?
satellite eyes or sensors
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Remote Sensing Images
human eye
satellite eyes
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Why are plants green in spring/summer and brown
in autumn?
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Vegetation
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Questions

• Do you think plants are the only thing that
  absorb and reflect different lights?
• How does pure water use light? (take a guess!)

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What else can we see from these satellite eyes?

• Oil spills in seas
• Deforestation
• Hurricanes and severe storms
• Fires
• Algae bloom in seas and rivers
• Much more

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Oil Spill - Spain Nov 17, 2002
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Oil Spill - Spain Nov 17, 2002
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Deforestation in Brazil
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Deforestation in Rondonia - Brazil
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Severe StormsFloyd - 1999
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Severe StormsAndrew
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Forest Fires - Oct 23 2002
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Forest Fires in Asia 2004
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Bloomed Black Sea
Mediterranean Sea
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Urban Growth Atlanta
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Ohio State - Mosaic from LandSat7
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Essay
This is science fiction. You are in living in
2200. In 2100 human beings vision had improved.
Now humans can see ultraviolet light as violet
rays and near infrared energy as golden color.
Describe how you would see your school back yard.