Passive and Active Remote Sensing

The video tutorial explains the classification of remote sensing into active and passive types. Active remote sensing involves sensors with their own illumination source, like radar systems. Passive remote sensing relies on external sources, such as sunlight, to illuminate the object being sensed. The tutorial provides examples of each type, such as cameras with built-in flash for active sensing and satellite imaging using sunlight for passive sensing. The video concludes with a summary of these concepts.

What are the two main types of remote sensing?

• Analog and Digital

• Direct and Indirect

• Active and Passive

• Static and Dynamic

In active remote sensing, what does the sensor include?

• A data storage unit

• A source of illumination

• A temperature sensor

• A built-in GPS

Which of the following is an example of active remote sensing?

• A digital camera without flash

• A satellite with a radar transponder

• A telescope

• A smartphone camera

How does a radar-equipped satellite function in remote sensing?

• It relies on gravitational waves

• It captures images using sunlight

• It uses thermal imaging

• It sends out and receives radar waves

What is the role of the sun in passive remote sensing?

• It acts as a data processor

• It stores the images

• It transmits signals

• It provides the energy source

In passive remote sensing, what does the sensor rely on?

• External illumination

• Built-in flash

• Its own energy source

• Internal data processing

Which example best illustrates passive remote sensing?

• A camera with a built-in flash

• A satellite using radar waves

• A smartphone with night mode

• A digital camera using sunlight

What is the primary difference between active and passive remote sensing?

• The type of data collected

• The presence of an internal energy source

• The speed of data transmission

• The size of the sensor

What is the key characteristic of passive remote sensing?

• It uses its own light source

• It depends on external light sources

• It requires no light at all

• It only works at night