A sensing device that requires an external source of power to operate.
In the context of remote sensing, an active sensor is a device with a transmitter that sends out a signal, light wavelength or electrons to be bounced off a target, with data gathered by the sensor upon their reflection. The data gathered by remote sensing is used for everything from cartography to resource exploration to atmospheric and chemical measurements. Remote sensing is also essential to the Internet of Things (IoT), in which almost any physical or logical entity can be equipped with a unique identifier and the ability to transfer data over a network autonomously.
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