The the sensors are not in direct contact

rapid development of world?wide urbanization causes many problems.
Infrastructure planning, uncontrolled urban sprawl and a
concentration of resources at the expense of the surrounding
countryside are the major problems. Hence, planners and resource
managers needs an effective mechanism to assess the consequences of
urbanization quickly. In the present scenario, remote sensing and GIS
proves to be the new technologies that can help to solve these
problems with up?to?date spatial information.

Remote sensing refers to the activities of recording, observing,
perceiving objects or events at far away places. In remote sensing,
the sensors
not in direct contact with the objects being observed. A physical
is required for the information to
travel from the objects to the sensors through an intervening medium.
The information carrier in remote sensing is electromagnetic
radiation. The result of a remote sensing system is usually an image
the scene being observed. In order to extract useful information from
the image, a further step of image analysis and interpretation is

in a demographic sense is defined as a process of growing population
concentration whereby the proportion of the total population which is
classified as urban is increasing(Jayalakshmy S. S., Mereena C.
S.).There are three components; natural increase, net in-migration
and changes in city boundaries as far as urban growth is concerned,
which result in incorporation of previously rural places.

areas are characterized by a central feature, which concentrates on
population, energy and materials, industrial and commercial
activities, and buildings and infrastructure. It is not any single
one of these factors, but the combination of them that defines urban
area. The only consistent thing about cities is that they are always