What kind of sensors are photogrammetry sensors Lidar Passiv

Solution

Photogrammetry: photogrammetry is the science of deriving accurate three-dimensional information from images.

It can be done by using 2 types of sensors :

1. ACTIVE SENSORS:Active sensor is more of a radar instrument not a microwave one. Objective of this device or sensor is also for measuring signals. However, they do not come from the sun like this. They throw their own energy source towards earth. This energy reflects from the earth’s surface. These reflections are detected and measured by active sensors.

2. PASSIVE SENSORS:Constituents of earth’s surface and its atmosphere produce natural emissions. Measuring these emissions is useful for global satellite purposes. For measuring these emissions, passive sensors are engineered using multiple microwave components and instruments. Passive sensors measure this energy or power as a function of surface combination of physical temperature, roughness and other physical characteristics related to earth.

LIDAR: A light Detection and Ranging which uses laser beam to hit the target and receive the backscattered or reflected light. As it uses its own source of light hence it is an active sensor.

please rate if satisfied...