Refer to this article:

Relationships between forest stand parameters and Landsat TM spectral response in the Brazilian Amazon Basin

Hi Abhinaya,

Infrared photography is now regularly used for measuring plant vigour and detecting stress caused by disease or lack of moisture and for terrain mapping. Photographic film is not sensitive to wavelengths beyond the near infrared region; thus, nonphotographic sensors must be used.

Infrared scanners can detect radiation in the thermal infrared band (3-14 um) and produce an image in which the brightness of an object in the scene is related to the temperature of the object. This technique is used from aircraft to measure heat loss through the roof of buildings caused by poor insulation, to trace effluents from power plants and sewers into rivers and lakes, to detect incipient forest or coal mine fires and to locate water supplies by detecting where underground streams discharge at the surface. It is used from spacecraft to map temperature distribution in water bodies.

Laser-based sensing systems have been developed in Canada to measure and map water depth in clear coastal waters, as well as to make terrain profiles for topographic mapping and tree height assessment.

Hope this helps a bit,

Cheers,

Frank

Grateful to you....!!!!

Some suggestions:

Automatic Fire detection systems:

http://www.dias-infrared.com/index.php/content/view/141/162/lang,en/

http://grvc.us.es/publica/congresosint/documentos/CI-055.99Distributed%20intelligent%20automatic.pdf

Visual Tree Assessment:

http://www.treethermography.it/papers/10.pdf

http://auf.isa-arbor.com/request.asp?JournalID=1&ArticleID=3190&Type=2

http://www.flir.com/cs/emea/it/view/?id=52123