Chapter 1: Introduction Remote Sensing

What is remote sensing?

• Collecting data through physical contact

• Collecting data without physical contact

• Observing objects with a microscope

• Collecting data with and without physical contact

Which of the following is NOT a component of the remote sensing system?

• Energy source

• Sensor

• Soil type

• Transmission medium

What is the primary source of energy in passive remote sensing?

• Artificial satellites

• The Sun

• Laser beams

• Earth's core

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

• LiDAR

• Photography

• Thermal imaging

• Aerial observation

In remote sensing, spatial resolution refers to:

• The color depth of the image

• The number of bands in an image

• The smallest object that can be detected

• The number of sensors on a satellite

Which type of remote sensing system can operate both day and night and in all weather conditions?

• Passive system

• Optical system

• Active system

• Infrared system

When was the first Landsat satellite (Landsat 1) launched?

• 1972

• 1990

• 1969

• 2020

What is the main advantage of active remote sensing?

• It relies on sunlight, making it simple and cost-effective.

• It can operate both day and night, independent of solar radiation.

• It provides natural color images similar to human vision.

• It is unaffected by atmospheric conditions such as clouds or rain.

Which of the following shows the correct steps in the passive remote sensing process?

• Energy emission from sensor → Interaction with Earth surface → Detection by satellite → Data processing

• Sunlight emission → Interaction with Earth surface → Reflection/emission detected by sensor → Data processing and interpretation

• Sensor generates its own energy → Energy interacts with target → Signal recorded → Data transmitted

• Data processing → Reflection/emission detected by sensor → Sunlight emission → Interaction with Earth surface

What is a major disadvantage of passive remote sensing?

• It cannot operate during nighttime or under heavy cloud cover.

• It requires high energy consumption to transmit signals.

• It is more expensive than active remote sensing systems.

• It cannot provide information about vegetation and land cover.