2.5.2. Types of Sensors

Try these first

1. 1.

   What is the primary source of energy for passive sensors?

   Hint

   Think about how these sensors capture images; what do they rely on?

2. 2.

   Can active sensors operate at night?

   Hint

   Consider how these sensors perform in various weather conditions.

3. 3.

   What is the main difference between passive and active sensors?

   • Passive sensors use internal energy; Active sensors use sunlight
   • Passive sensors work only during the day; Active sensors can work at night
   • Passive sensors are faster than active sensors

   Hint

   Recall the definitions of both types of sensors.

4. 4.

   True or False: LiDAR is a passive sensor.

   • True
   • False

   Hint

   Consider whether LiDAR uses external light.

5. 5.

   In an engineering project, you need to monitor land degradation during nighttime. Which type of sensor would you use and why? Discuss your reasoning.

   Hint

   Think about sensor functioning in different light conditions.

6. 6.

   Consider a scenario where atmospheric conditions prevent sunlight from reaching the Earth’s surface. Which type of sensor would provide reliable data in this case, and why?

   Hint

   Consider which sensor emits energy.