REMOTE SENSING SYSTEM

INTRODUCTION

Remote sensing system

The gathering of information from an object or surface without direct contact.

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.

Types Passive Remote Sensing

Photography Radiometers Infrared

Active Remote Sensing RADAR LiDAR

ApplicationsForestry

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.

Spectral Signature

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

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

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

Quantized incoming energyanalyze the numerical values in the bands of

a multispectral image

Radiometric Resolution

High Resolutions Low Resolution

Multi Spectral Hyper Spectral:

Resolutions

System UsedOptical System

Panchromatic imaging system Multispectral imaging system Super spectral Imaging System Hyper spectral Imaging System

RADAR System

LiDAR System

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.

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

Multispectral Imaging SystemUses a multi channel detector and records radiation

with a narrow range

Brightness and color informatics are available

Super Spectral Imaging SystemFiner spectral feature that capture by the sensors.

RADAR SystemRadio Detection And RangingObject detection system which uses electromagnetic

waves determine range, direction or speed

How it WorksDetect the presence of an object at a distanceDetect the speed of an objectMap something

Echo Doppler Shift

LiDAR SystemLight Detection And RangingMeasures distance by sending pulses of laser light that

strike and reflect from the surface of earth.

REFERENCEShttp://www.howstuffworks.com/radar.htmhttp://www.physicalgeography.net/fundamentals/

2e.htmlwww.howstuffworks.comwww.remotesearch.inhttp://www.tutavivito.com