Differentiate between active system and passive system of remote sensing.

Differentiate between active system and passive system of remote sensing.
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1 Answer

Answer :

Sr.No. Active System
Passive System
1 In this system man made resources of energy are used.
In this system natural sources of are used.
2 The electromagnetic waves are transmitted and reflected back from ground to record the data.
The natural sunrays are allowed to impact on ground objects and received back from earth surface to collect data.
3 The active remote sensors like satellite or airborne sensors, micro wave sensors, radar, etc. are useful. 
The passive remote sensors like film photography, infrared and radiometers are useful.
4 It gives more accurate details of ground objects even from higher elevation.
This system may give less accurate outputs because of variation in sunlight.
5 It is widely applicable in flood, earthquake disaster management and subsoil exploration.
This system is limitedly useful in land use and land cover analysis and small scale mapping.
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