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Basic of Remote Sensing III

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Contents Advantages Limitations Applications Advantages of Remote Sensing : Provides a synoptic view over a large region; Offers Geo-referenced information and digital information; Most of the remote sensors operate in every season, every day, every time and even in tough weather; Limitations : Can be expensive; Can be technically difficult; Not direct; Measure surrogate variables e.g. reflectance (%), brightness temperature, backscatter; Applications of Remote Sensing Urban & Regional Planning Scope: Mapping & updation of city/town maps  Urban sprawl monitoring Town planning Facility management  GIS database development Benefits: Better decision support, planning & management Rapid information updation Infrastructure development monitoring Spatial information analysis Agriculture Scope: Crop acreage estimation Crop modeling for yield & production forecast / estimation Crop & Orchard monitoring Soil sensing ...
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Basic of Remote Sensing IV

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Sources of Electromagnetic Energy There are three main sources of  electromagnetic radiation that are used in  remote sensing:  Solar radiation (natural radiation from the  sun)  Terrestrial radiation (natural radiation  emitted by Earth's surface)  Artificial radiation (from a remote sensing  system) Solar Radiation The Sun yields a continuous spectrum of EM  energy. This Incident radiation can be reflected  from the Earth's surface. This process produces a large amount of  short wavelength energy (from 0.4 - 0.7 µm;  blue, green, and red light). It can also be emitted by the Earth's  surface. Such emitted radiation is typically  of a longer wavelength, in the middle and  far infra-red wavelengths. Interacts with the atmosphere and surface  materials (reflect, absorb).  Since the Sun has a much higher temperature  (6000 degrees K) than the Earth (303 degrees  K), so t...
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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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