Remote Sensing: INTRO

Technology to acquire, receive information about the Earth's surface without being in the actual surface:

American Society for Photogrammetry and Remote Sensing in 1988: The art, science and technology of obtaining reliable information about physical objects and the environment, through the process of recording, measuring and interpreting imagery and digital representations of energy patterns derived from non-contact sensor systems.

  •             (ENERGY SOURCE ~ RADIATION ~ TARGET INTERACTION)
  •             (RECORDING REFLECTED or EMITTED ENERGY)
  •             (ANALYZING AND INTERPRETING THEM)

Platforms: Aerial Television, Photography, Satellite Optical Sensor, Space Shuttle, Airborne SAR

Technology involves interaction between radiation and targets
*Passive RS* (external source of energy not needed, suffers from variable illumination condition of Sun [influence of atmosphere])
*Active RS*   (own source of energy, illuminations signal controlled)

Illustration of Remote Sensing (Source: Commons)


a. Source of Energy: provides electromagnetic energy
b. Radiation and the atmosphere: interaction with the atmosphere 
c. Target: interaction with the target (signatures are different)
d. recording of the energy and transmission: electromagnetic radiation collected, and transmitted to the earth stations
e. Reception and processing 
f. Interpretation and analysis
g. Application to the domain: weather forecasting, climate change etc.


History:
Hot Air Balloon, 1858AD
Pigeon mounted Camera, 1903
Plane Mounted cameras 1914-1945 WWII
1st spaced Photo, 1947 (K12 camera)
MR 3 spacecraft, US 1963
Apollo Moon Landing Mission
RS starts from 1972 ERTS (Earth Resources Technology Satellite); renamed Landsat
1986 SPOT (10 PAN, 20 m spatial resolution)
1970-1980 Advances in digital image processing
1980s : Hyper-spectral Sensors
1990s: Global Remote Sensing Systems

 
~ROUGH NOTES Based on lectures from IIT Roorkee (Online Course)

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Learner, Loves/Learns agronomy, remote sensing, gis, other interests in writing poetry, learning languages, literature, learning the guitar, (+ve person)