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Remote Sensing: Introduction and Basic Concepts Basic concepts of remote sensing
MODULE – 1 LECTURE NOTES – 1 BASIC CONCEPTS OF REMOTE SENSING
Remote sensing is an art and science of obtaining information about an object or feature without physically coming in contact with that object or feature. Humans apply remote sensing in their day-to-day business, through vision, hearing and sense of smell. The data collected can be of many forms: variations in acoustic wave distributions (e.g., sonar), variations in force distributions (e.g., gravity meter), variations in electromagnetic energy distributions (e.g., eye) etc. These remotely collected data through various sensors may be analyzed to obtain information about the objects or features under investigation. In this course we will deal with remote sensing through electromagnetic energy sensors only.
Thus, remote sensing is the process of inferring surface parameters from measurements of the electromagnetic radiation (EMR) from the Earth’s surface. This EMR can either be reflected or emitted from the Earth’s surface. In other words, remote sensing is detecting and measuring electromagnetic (EM) energy emanating or reflected from distant objects made of various materials, so that we can identify and categorize these objects by class or type, substance and spatial distribution [American Society of Photogrammetry, 1975].
Fig. 1. Schematic representation of remote sensing technique (Source: http://geoportal.icimod.org)
D Nagesh Kumar, IISc, Bangalore 1 M1L1
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