Transcript Remote Sensing

Create a “False Color” image
You can transform
electromagnetic radiation
from one frequency to another frequency
The electromagnetic spectrum includes a wide range
of frequencies of electromagnetic radiation.
The human eye can only see the visible light.
Colors can be used to represent electromagnetic radiation
that we can not see.
http://chandra.harvard.edu/photo/false_color.html
Meteorologists use radar to study the reflection of radio
waves from raindrops or snowflakes
so that they can determine rates and types of precipitation.
http://science.nasa.gov/headlines/y2007/02mar_rainandsnow.htm
Reflected radio waves are not visible to the human eye.
Different colors of visible light can be used to represent
different amounts of reflected radio waves.
This results in a “false color” image
of precipitation rates and amounts used in weather reports.
http://www.google.com/webhp?hl=en
Changes in the way that ice causes radio waves to
scatter can be used to determine the age of ice.
http://eosweb.larc.nasa.gov/HPDOCS/misr/misr_html/beaufort_sea_ice.html
Your Remote Sensing Design Challenge
• Build a model of a remote sensing satellite.
• Calibrate your model.
• Create a model of a landscape using
different colors of construction paper.
• Use your model of a satellite to analyze light
reflected or emitted from the landscape.
• Create a “false color” image by representing
one color of visible light with a different color
of visible light.
• Create a landscape from a set of remote
sensing data.
The key component of a model of a
remote sensing satellite is a
light emitting diode (LED).
http://electronics.howstuffworks.com/led.htm
LEDs can emit and detect light.
LEDs are usually used to
emit light of a specific
wavelength.
LEDs can also transform
light into an electrical signal.
The frequency of light that a LED detects is
similar to the wavelength of light the LED emits.
The voltage produced by the LED is proportional
to the intensity of the light detected by the LED.
http://mvh.sr.unh.edu/mvhinvestigations/light_investigations.htm
Is heavy rainfall really red?
What king of electromagnetic radiation was
used to produce the image with different
colors of visible light?
http://www.google.com/webhp?hl=en
You used a model of a remote sensing
satellites to construct a
false color image of a landscape.
• What is a “false color” image?
• How was your false color image of a
landscape similar to a false color image of
precipitation used in weather reports?
• How was your false color image of a
landscape different from a false color
image of precipitation?