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Welcome Post

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Welcome to my new blog. To begin with, I would highlight the  objective of the blog  briefly. When I first ventured into the field of Remote Sensing and GIS, it was a period when the subject was treated as a tool or device for solving geospatial problems. Even then it had the clout of an academic discipline, which was overlooked by a lot of mainstream academicians. Even now I find it amusing when this rich multi-disciplinary subject is referred to as a mere tool. Nevertheless, I will make a sincere attempt to take the discipline to as many enthusiasts and practitioners of Remote Sensing and GIS as possible in a simple manner.  The entire purpose of this blog will be to provide -  Document-based tutorials; Powerpoint presentations; Project development techniques; Dissertation guidelines; Book reviews; Sample test questions; Practical training (through youtube videos*); To conclude, I would give a brief  introduction  about me. I am a Remote ...
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Basic of Remote Sensing

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Contents What is Remote Sensing? Need for Remote Sensing? Who uses Remote Sensing and Why? Remote Sensing :  The art & science of  acquiring, processing, and interpreting information (images and related data) about the Earth’s surface without  actually being in physical contact between the object and sensor. This is done by sensing & recording reflected or emitted energy  and processing, analyzing and applying that information. The images and related data are obtained from ground-based, air-or space- borne instruments that record the interaction between matter (target) and  electromagnetic radiation. " remotely" means using instruments (sensors) carried by platforms . Need For Remote Sensing Systematic data collection; Global coverage; Repeatability; Inaccessible areas – sometimes the only solution; Multi-purpose information Who Uses Remote Sensing & Why The geographer who looks for changes in the E...
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Electromagnetic Radiation

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Electromagnetic Energy Interactions When the energy being remotely sensed comes from the Sun, the energy: Propagates through the vacuum of space Interacts with the Earth's atmosphere, surface, and atmosphere (reflected, absorbed, transmitted); Reaches the remote sensor (interacts with various optical systems, filters, emulsions, or detectors); Electromagnetic Radiation Transfer of energy from one body to another in the form of electromagnetic waves is referred to as Electromagnetic Radiation. To understand how electromagnetic radiation is created, how it propagates through space, and how it interacts with other matter, it is useful to describe the processes using two different models popularly known as Electromagnetic Radiation Models:  the wave model; the particle model Wave Model of EM Energy An electromagnetic wave is composed of electric and magnetic vectors that are orthogonal to one another and travel from the source ...
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