Remote Sensing (Unit-III)

Which satellites are known as Remote Sensing Satellites?

• Navigation satellites
• Earth observation satellites
• Weather satellites
• Communication satellites

How do satellites "see" things?.

• By reading people's minds
• Sensing electromagnetic radiation

• By asking for directions
• All of these

What is speed of light in the space?

• 299,792,458 meters per second
• 1,000,000,000 meters per second
• 500,000,000 meters per second
• 100,000,000 meters per second

What happens with EMR, when it enters in earths' atmosphere?

• It interacts with gases and particles, causing scattering and absorption

• It turns into a solid form
• It disappears completely
• It creates a protective shield around the earth

When light is reflected off a surface, it is detected by passive remote sensing satellites and produces________________,which we use to identify different surfaces.

• Rainbow

• Pulsar

• Spectral Signatures

• Awe inspiring moment

Healthy vegetation reflects energy in what parts of the electromagnetic spectrum?

• Blue and Green

• Green and Near-Infrared

• Blue and Red

• Green and Red

What part of the electromagnetic spectrum can be see with our eyes?

• Near-Infrared

• Red, Green, Blue

• Microwave and radio

• Ultraviolet rays

Water appears blue because shorter visible wavelengths (blue) are absorbed more than longer visible wavelengths (green and red) and near-IR radiation.

• True

• False

Polar orbiting satellites are generally placed at an altitude range of __________.

• 100 to 500 kilometers

• 1,000 to 1,500 kilometers
• 10,000 to 15,000 kilometers
• 500 to 1000 kilometers

The altitudinal distance of a geostationary satellite from the earth is about_____km.

• 26,000

• 30,000

• 36,000

• 44,000