Question

India's INSAT satellites are examples of :

• A. Geostationary satellites
• B. Polar orbiting satellites
• C. Navigation satellites
• D. Sun synchronous satellites

Answer 1

Answer:

A. Geostationary satellites

Satellite Remote Sensing

• The process of gathering information using the sensors installed in artificial satellites is known as satellite remote sensing

• The process of collecting information using sensors fixed on artificial satellites is called satellite remote sensing.

• The artificial satellites are mainly divided into two types: Geostationary satellites and Sun Synchronous satellites

Geostationary satellites

• These are the satellites that move in equal velocity with the earth's rotation.

• They orbit the earth at an elevation of about 36000 kilometers above the earth.

• One third of the earth comes under its field of view

• As the movement of these satellites corresponds to the speed of rotation of the earth, it stays constantly above a specific place on the earth.

■ This helps in continuous data collection of an area.

■ It is used in telecommunication and for weather studies.

■ India's INSAT satellites are examples of geostationary satellites

Sun synchronous satellites

• Sun synchronous satellites are the artificial satellites that passes around the earth along the poles.

• The orbit of these satellites is about 900 km in altitude.

• The surveillance area is less than that of the geostationary satellites.

• The repetitive collection of information of a region at regular interval is possible.

• Used for the collection of data on natural resources, land use, ground water etc.

■ These satellites are mainly used for remote sensing purposes.

■ Satellites in IRS, Landsat series are examples of sun synchronous satellites.

• Photo interpretation institute was established at Dehradum in 1966 for analyzing and studying aerial photographs.

• Later this institution becomes Indian institute of Remote sensing (IIRS).