ppt on remote sensing system
TRANSCRIPT
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REMOTE SENSING SYSTEM
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INTRODUCTION
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Remote sensing system
The gathering of information from an object or surface without direct contact.
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History1858 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.
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Types Passive Remote Sensing
Photography Radiometers Infrared
Active Remote Sensing RADAR LiDAR
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ApplicationsForestry
Agriculture
Hydrology
Sea Ice
Land Cover & Land Use
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Techniques Spectral Signatures
Image Acquisition
Spatial Resolution
Spectral Resolution
Multispectral Images
Radiometric Resolution
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signatures produced by wavelength-dependent absorption.
the ratio of reflected energy to incident energy as a function.
Spectral Signature
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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.
Image Acquisition
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a function of the design of the sensordetectors in a remote sensor measures
energy received from a finite patch of the ground surface
Spatial Resolution
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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
Multispectral Images
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Quantized incoming energyanalyze the numerical values in the bands of
a multispectral image
Radiometric Resolution
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High Resolutions Low Resolution
Multi Spectral Hyper Spectral:
Resolutions
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System UsedOptical System
Panchromatic imaging system Multispectral imaging system Super spectral Imaging System Hyper spectral Imaging System
RADAR System
LiDAR System
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Optical Remote SystemOptical remote sensing makes use of visible, near
infrared and short-wave infrared sensors to form images of the earth's surface by detecting the solar radiation reflected from targets on the ground.
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Panchromatic Imaging SystemA single channel sensor is used to detect radiationIf range of wavelength and the visible range become
same then the imagery will appear as a black and white photograph taken from space
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Multispectral Imaging SystemUses a multi channel detector and records radiation
with a narrow range
Brightness and color informatics are available
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Super Spectral Imaging SystemFiner spectral feature that capture by the sensors.
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RADAR SystemRadio Detection And RangingObject detection system which uses electromagnetic
waves determine range, direction or speed
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How it WorksDetect the presence of an object at a distanceDetect the speed of an objectMap something
Echo Doppler Shift
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LiDAR SystemLight Detection And RangingMeasures distance by sending pulses of laser light that
strike and reflect from the surface of earth.
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REFERENCEShttp://www.howstuffworks.com/radar.htmhttp://www.physicalgeography.net/fundamentals/
2e.htmlwww.howstuffworks.comwww.remotesearch.inhttp://www.tutavivito.com
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