What is Remote Sensing?
Remote Sensing is the science of acquiring, processing and interpreting images that record the interaction between electromagnetic energy and matter. (Sabins, 1996)
Remote Sensing is the science and art of obtaining information about an object, area, or phenomenon through the analysis of data acquired by a device that is not in contact with the object, area, or phenomenon under investigation. (Lillesand and Kiefer, 1994).
Why Remote Sensing?
Remote Sensing Concepts:
Electromagnetic Spectrum:
The Electromagnetic Spectrum represents a continuum of electromagnetic radiation arranged on the basis of wavelength or frequency. Electromagnetic spectrum ranges from shorter wavelengths (gamma rays and x-rays) to the longer wavelengths (microwave and radio waves)
Classification of Electromagnetic Radiation:
Type of Remote Sensing with respect to wavelength regions:
Energy Interaction with Atmosphere:
- Scattering
- Absorption
- Refraction
Energy Interaction with Earth Surface:
- Radiation
- Reflection
- Transmission & Absorption
- Earth’s Emission
Stages in Remote Sensing Process:
- Energy Source
- Energy Interaction with the atmosphere
- Interaction
- Recording of Energy by Sensor
- Data Transmission and Processing
- Image Processing and Analysis
- Applications
Trends in Application:
Remote Sensing Applications in Agriculture:
- Crop health monitoring
- Command area management
- Land degradation
- Watershed management
- Crop Acreage estimation & Forecasting
- Agro-Climatic Information System
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