As we learnt in primary school, sun constantly emits light energy and is only source of natural light for earth. Based on received energy various measurements have been carried out. There are two main types of sensors used in remote sensing technology, active sensors and passive sensors. Some examples of active sensors are a laser fluorosensor and a synthetic aperture radar (SAR). However, active systems require the generation of a fairly large amount of energy to adequately illuminate targets. Specific satellites are used for this purpose. Each of the systems has its own pros and cons that can help you decide whether it’s right for your application. Below are some of the advantages and disadvantages of remote sensing.

• There are two main types of remote sensing satellites viz. Active sensors can be used for examining wavelengths that are not sufficiently provided by the sun, such as microwaves, or to better control the way a target is illuminated. This involves the detection and measurement of radiation of different wavelengths reflected or emitted from distant objects or materials, by … It’s important to understand the difference between these systems to select the most appropriate type of imagery for your applications. The sun's energy is either reflected, as it is for visible wavelengths, or absorbed and then re-emitted, as it is for thermal infrared wavelengths. The sun provides a very convenient source of energy for remote sensing. • Remote sensing is acquiring of data about an object without touching it. Difference between these two is quite small, however, leaves great impact on … Passive RFID Technologies The simplest of the three RFID configurations is one that uses an active reader and passive tags. Advantages of remote sensing technology: Large area coverage: Remote sensing allows coverage of very large areas which enables regional surveys on a variety of themes and identification of extremely large features. Difference between these two is quite small, however, leaves great impact on their functionality. Remote sensing is the science and art of identifying, observing, and measuring an object without coming into direct contact with it. • Passive sensing receives emitted EM energy from various objects which is result of sun's reflected energy from them. There are two types of remote sensing technology, active and passive remote sensing. passive and active. Passive sensors, often referred to as electro-optical or simply optical, acquire the reflected electromagnetic waves of the sunlight and/or the emitted infrared radiation by objects on the ground.