Ppt on remote sensing system


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Ppt on remote sensing system

  2. 2. Remote sensing system The gathering of information from an object or surface without direct contact.
  3. 3. History 1858 Balloonist G.Tournachon made photographs of Paris from his balloon. Systematic aerial photography developed for military and reconnaissance purposes beginning in World War I and reaching a climax during the Cold War . Artificial satellites in the latter half of the 20th century.
  4. 4. Types Passive Remote Sensing  Photography  Radiometers  Infrared Active Remote Sensing  RADAR  LiDAR
  5. 5. Applications Forestry Agriculture Hydrology Sea Ice Land Cover & Land Use
  6. 6. Techniques Spectral Signatures Image Acquisition Spatial Resolution Spectral Resolution Multispectral Images Radiometric Resolution
  7. 7.  signatures produced by wavelength-dependent absorption. the ratio of reflected energy to incident energy as a function.
  8. 8.  radiant energy that is measured by an aerial or satellite sensor electromagnetic energy returned from the Earth’s surface can be detected by a light-sensitive film.
  9. 9.  a function of the design of the sensor detectors in a remote sensor measures energy received from a finite patch of the ground surface
  10. 10.  Parallel sensor arrays detecting radiation in a small number of broad wavelength bands allow discrimination of different types of : vegetation, rocks and soils, clear and turbid water, and some man-made materials
  11. 11.  Quantized incoming energy analyze the numerical values in the bands of a multispectral image
  12. 12. High Resolutions Low ResolutionMulti Spectral Hyper Spectral:
  13. 13. System Used Optical System  Panchromatic imaging system  Multispectral imaging system  Super spectral Imaging System  Hyper spectral Imaging System RADAR System LiDAR System
  14. 14. Optical Remote System Optical remote sensing makes use of visible, near infrared and short-wave infrared sensors to form images of the earths surface by detecting the solar radiation reflected from targets on the ground.
  15. 15. Panchromatic Imaging System A single channel sensor is used to detect radiation If range of wavelength and the visible range become same then the imagery will appear as a black and white photograph taken from space
  16. 16. Multispectral Imaging System Uses a multi channel detector and records radiation with a narrow range Brightness and color informatics are available
  17. 17. Super Spectral Imaging System Finer spectral feature that capture by the sensors.
  18. 18. RADAR System Radio Detection And Ranging Object detection system which uses electromagnetic waves determine range, direction or speed
  19. 19. How it Works Detect the presence of an object at a distance Detect the speed of an object Map something  Echo  Doppler Shift
  20. 20. LiDAR System Light Detection And Ranging Measures distance by sending pulses of laser light that strike and reflect from the surface of earth.
  21. 21. REFERENCES http://www.howstuffworks.com/radar.htm http://www.physicalgeography.net/fundamentals/ 2e.html www.howstuffworks.com www.remotesearch.in http://www.tutavivito.com