Remote Sensing

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Remote Sensing
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• More houses, more cars, more congestion, more
  pollution...
• Will it ever end???
• Is there hope??

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• Yes!!!
• We can have a sustainable future.
• How???
• With the use of spatial technologies such as GIS,
  Remote Sensing we can have the knowledge to
  manage our resources better.
• Growth can occur and everyone can have a better
  life
• YOU can be a part of this by being spatial
  technology experts

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• What is Remote Sensing?
• Remote sensing is just a technical term for the
  science of gathering data using a sensor that is
  not in immediate contact with the object being
  studied.
• When you look or hear something, you are using
  Remote Sensing.

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Remote Sensing is getting the Big Picture
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How did Remote Sensing start?

• The hot air balloon
• The airplane
• Photography
• Later cameSatellitesOther technology

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• Today the Earth is constantly monitored by a
  variety of sensors in orbit on satellite and
  airplane platforms. These carry remote sensors,
  which are cameras and electronic scanners that
  send information back to Earth to form images.
• The remote sensors onboard satellites and
  airplanes are collecting information about the
  Earth from above without being in physical
  contact with the planet (sensing without
  touching). The data these sensors provide are a
  powerful source of information about what is
  happening on and to our planet.

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BilSAT(Turkish Republic)
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• The Earth's surfaces reflect incoming energy from
  the sun.
• Think of when you look at a blanket of snow or
  the surface of a water body when it's sunny. It
  almost hurts your eyes to look at them. These
  objects are clearly reflecting the sun's energy
  quite strongly. On the other hand, the surface of
  a road that's been tarred or the black top of a
  roof are not too bright to look at. They are
  absorbing more of the sun's energy than they
  reflect.
• Most of the remote sensing satellites carry
  scanners that record the amount of reflected
  light energy of the sun from the Earth's
  surfaces, be it land, water, or human-created
  objects such as buildings. Specifically, these
  scanners record this reflected energy within
  specific segments of the electromagnetic spectrum
  (EMS)

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Different Land Uses reflect differently
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A- Energy Source (the Sun) B-Energy is
transmitted through the atmosphere and reflected
back into the atmosphere C-Land uses reflects,
absorbs or scatters energy and reflected
back D-Satellites record energy
transmissionsE-Satellites transmit back to
recording station or another satille F-transmissio
n is processed G-Image is interpreted
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Electro-magnetic Spectrum
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Types of Remote Sensing

• Passiveusing reflected energy
• Active beaming energy from a remote source and
  reflection back to the receiver (e.g., radar)

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Infrared Image of Istanbul (2000)

• http//veimages.gsfc.nasa.gov/15515/aster_istanbul
  _lrg.jpg

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Radar Image Istanbul (2005??)

• http//www.universetoday.com/am/uploads/2005-0624i
  stanbul-full.jpg

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• Images are made up of pixels (rasters) that have
  a certain dimension (i.e. 1 square meter to 1
  squre kilometer)
• These images can measure the amount of different
  types of land cover (i.e., forest, urban,
  agriculture etc.) and also change in the
  landscape
• Together with GIS and GIS, Remote Sensing is a
  powerful tool for spatial analysis

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Remote Sensing Applications

• Mapping (generally using high resolution
  satallite images or areal photographs)
• Agriculture
• Urban Planning
• Archelogy
• Environmental Analysis
• Forestry
• Climate and weather
• Hydrology
• Flood control and monitoring
• Many more

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Some interesting links

• http//www.sciencenetlinks.com/Esheet.cfm?DocID47
  
• http//rst.gsfc.nasa.gov/
• http//www.bilten.metu.edu.tr/bilsat/en/root/
• http//landsat.gsfc.nasa.gov/
• http//www.spotimage.fr/html/_167_.php
• http//www.satimagingcorp.com/gallery-ikonos.html