Introduction
Remote Sensing is the science and art of acquiring information (spectral, spatial, temporal) about material objects, area, or phenomenon, without coming into physical contact with the objects, or area, or phenomenon under investigation. Without direct contact, some means of transferring information through space must be utilised. In remote sensing, information transfer is accomplished by use of electromagnetic radiation (EMR). EMR is a form of energy that reveals its presence by the observable effects it produces when it strikes the matter. EMR is considered to span the spectrum of wavelengths from 10-10 mm to cosmic rays up to 1010 mm, the broadcast wavelengths, which extend from 0.30-15 mm.

Types

1. In respect to the type of Energy Resources:
   Passive Remote Sensing: Makes use of sensors that detect the reflected or emitted electro-magnetic radiation from natural sources.
   
   Active remote Sensing: Makes use of sensors that detect reflected responses from objects that are irradiated from artificially-generated energy sources, such as radar.
   
   
2. In respect to Wavelength Regions:
   Remote Sensing is classified into three types in respect to the wavelength regions
   • Visible and Reflective Infrared Remote Sensing.
   • Thermal Infrared Remote Sensing.
   • Microwave Remote Sensing.

Some Interesting Links :

• Principles of Remote Sensing
  An Article from the Virtual Science Centre
  
• About Remote Sensing
  From Australia's National mapping Agency
  
• Remote Sensing
  An Overview of Remote Sensing
  
• Remote Sensing of the Global Environment
  An Article by David J. Schneider, Michigan Technological University
  
• RS introduction
  This unit introduces basic concepts of remote sensing of the environment - University of Texas
  
• The Concept of Remote Sensing
  Historical & Technical Perspectives of Remote Sensing
  
• RS Introduction and History
  An Article from Earth Observatory, NASA
  
• Remote Sensing
  Introduction to Remote Sensing for Agriculture - An Article by U. S. Water Conservation Laboratory
  
• Remote Sensing
  Introduction to Satellites and Remote Sensing
  
• The philosophical underpinnings of remote sensing
  The Philosophy behind Remote Sensing can perhaps....- An Article by GDSPDS
  
• GOES 3.9um Channel Tutorial
  An excellent tutorial on Thermal Remote Sensing
  

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