The the sensors are not in direct contact

Therapid development of world?wide urbanization causes many problems.Infrastructure planning, uncontrolled urban sprawl and aconcentration of resources at the expense of the surroundingcountryside are the major problems. Hence, planners and resourcemanagers needs an effective mechanism to assess the consequences ofurbanization quickly. In the present scenario, remote sensing and GISproves to be the new technologies that can help to solve theseproblems with up?to?date spatial information. Generally,Remote sensing refers to the activities of recording, observing,perceiving objects or events at far away places. In remote sensing,the sensorsarenot in direct contact with the objects being observed.

A physicalcarrieris required for the information totravel from the objects to the sensors through an intervening medium.The information carrier in remote sensing is electromagneticradiation. The result of a remote sensing system is usually an imagerepresentingthe scene being observed. In order to extract useful information fromthe image, a further step of image analysis and interpretation isdone.

Urbanizationin a demographic sense is defined as a process of growing populationconcentration whereby the proportion of the total population which isclassified as urban is increasing(Jayalakshmy S. S., Mereena C.S.

).There are three components; natural increase, net in-migrationand changes in city boundaries as far as urban growth is concerned,which result in incorporation of previously rural places.Urbanareas are characterized by a central feature, which concentrates onpopulation, energy and materials, industrial and commercialactivities, and buildings and infrastructure. It is not any singleone of these factors, but the combination of them that defines urbanarea. The only consistent thing about cities is that they are alwayschanging.

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