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Remote Sensing is the science and art
of acquiring information (spectral, spatial, temporal) about material
objects, area, or phenomenon, without coming into physical contact with
the objects, or area, or phenomenon under investigation. Without direct
contact, some means of transferring information through space must be
utilised. In remote sensing, information transfer is accomplished by
use of electromagnetic radiation (EMR). EMR is a form of energy that
reveals its presence by the observable effects it produces when it strikes
the matter. EMR is considered to span the spectrum of wavelengths from
10-10 mm to cosmic rays up to 1010 mm, the broadcast wavelengths, which
extend from 0.30-15 mm.
Types
- In respect to the type of Energy Resources:
Passive Remote Sensing: Makes use of sensors that detect
the reflected or emitted electro-magnetic radiation
from natural sources.
Active remote Sensing: Makes use of sensors
that
detect reflected responses from objects that are
irradiated from artificially-generated energy sources,
such as radar.
- In respect to Wavelength Regions:
Remote Sensing is classified into three types in respect to the
wavelength regions
- Visible and Reflective
Infrared Remote Sensing.
- Thermal Infrared Remote Sensing.
- Microwave Remote Sensing.
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This technique may be the most effective way to collect the information.
Aerial Photographs and Imagery carry huge amounts of analogue data. When
interpreted, they can provide valuable information. This technique is
helpful for environmental data, plan more detailed field investigations,
discover certain classes of properties, map sites, locate and confirm
the presence of predicted sites.
- PAN Images
- LISS III
- IKONOS
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