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Publication Title | PRINCIPLES OF REMOTE SENSING

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PRINCIPLES OF REMOTE SENSING
Shefali Aggarwal
Photogrammetry and Remote Sensing Division
Indian Institute of Remote Sensing, Dehra Dun
Abstract : Remote sensing is a technique to observe the earth surface or the
atmosphere from out of space using satellites (space borne) or from the air using
aircrafts (airborne). Remote sensing uses a part or several parts of the
electromagnetic spectrum. It records the electromagnetic energy reflected or emitted
by the earth’s surface. The amount of radiation from an object (called radiance) is
influenced by both the properties of the object and the radiation hitting the object
(irradiance). The human eyes register the solar light reflected by these objects and
our brains interpret the colours, the grey tones and intensity variations. In remote
sensing various kinds of tools and devices are used to make electromagnetic radiation
outside this range from 400 to 700 nm visible to the human eye, especially the
near infrared, middle-infrared, thermal-infrared and microwaves.
Remote sensing imagery has many applications in mapping land-use and cover,
agriculture, soils mapping, forestry, city planning, archaeological investigations,
military observation, and geomorphological surveying, land cover changes,
deforestation, vegetation dynamics, water quality dynamics, urban growth, etc. This
paper starts with a brief historic overview of remote sensing and then explains the
various stages and the basic principles of remotely sensed data collection mechanism.
INTRODUCTION
emote sensing (RS), also called earth observation, refers to obtaining
Rinformation about objects or areas at the Earth’s surface without being
in direct contact with the object or area. Humans accomplish this task with
aid of eyes or by the sense of smell or hearing; so, remote sensing is day-to-
day business for people. Reading the newspaper, watching cars driving in front
of you are all remote sensing activities. Most sensing devices record information
about an object by measuring an object’s transmission of electromagnetic energy
from reflecting and radiating surfaces.
Satellite Remote Sensing and GIS Applications in Agricultural Meteorology
pp. 23-38

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