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Ppt on remote sensing system Ppt on remote sensing system Presentation Transcript

  • INTRODUCTION
  • Remote sensing system The gathering of information from an object or surface without direct contact.
  • 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.
  • Types Passive Remote Sensing  Photography  Radiometers  Infrared Active Remote Sensing  RADAR  LiDAR
  • Applications Forestry Agriculture Hydrology Sea Ice Land Cover & Land Use
  • Techniques Spectral Signatures Image Acquisition Spatial Resolution Spectral Resolution Multispectral Images Radiometric Resolution
  •  signatures produced by wavelength-dependent absorption. the ratio of reflected energy to incident energy as a function.
  •  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.
  •  a function of the design of the sensor detectors in a remote sensor measures energy received from a finite patch of the ground surface
  •  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
  •  Quantized incoming energy analyze the numerical values in the bands of a multispectral image
  • High Resolutions Low ResolutionMulti Spectral Hyper Spectral:
  • System Used Optical System  Panchromatic imaging system  Multispectral imaging system  Super spectral Imaging System  Hyper spectral Imaging System RADAR System LiDAR System
  • 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.
  • 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
  • Multispectral Imaging System Uses a multi channel detector and records radiation with a narrow range Brightness and color informatics are available
  • Super Spectral Imaging System Finer spectral feature that capture by the sensors.
  • RADAR System Radio Detection And Ranging Object detection system which uses electromagnetic waves determine range, direction or speed
  • How it Works Detect the presence of an object at a distance Detect the speed of an object Map something  Echo  Doppler Shift
  • LiDAR System Light Detection And Ranging Measures distance by sending pulses of laser light that strike and reflect from the surface of earth.
  • REFERENCES http://www.howstuffworks.com/radar.htm http://www.physicalgeography.net/fundamentals/ 2e.html www.howstuffworks.com www.remotesearch.in http://www.tutavivito.com