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.
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.