Remote Sensing – In Civil Engineering

What is Remote Sensing?

A remote sensing: Remote sensing is the process of detecting and monitoring the physical characteristics of an area, which usually measures the radiation distance reflected and emitted from a satellite or aircraft.  Special cameras collect sensory images from far away, helping researchers “sense” things about the Earth.  

Types of Remote Sensing 

  1. Active Remote Sensing
  2. Passive remote sensing

Active Remote Sensing

Active sensors emit energy to scan objects and areas and a sensor then detects and measures radiation that is reflected or backscattered from the target.  

Examples: RADAR and LIDAR. 

Passive remote sensing 

Passive sensors collect radiation that is emitted or which is reflected by the object or surrounding areas.  Reflected sunlight is the most common source of radiation measured by passive sensors.  

Examples: film photography, infrared, charge-coupled devices and radiometers.

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