Broadly speaking, the Remote Sensing (Remote Sensing) refers to various non-direct contact, remote sensing technology. Collected primarily on the basis of the target object of the electromagnetic wave reflection and radiation characteristics, use of sound waves, gravitational waves and seismic waves, etc., are also included in the broad sense among remote sensing.
People usually considered to refer to the concept of remote sensing: From remote, high altitude, and even outer space platform (Platform), the use of visible light, infrared, microwave remote sensors (Remote Sensor), through photography, scanning and other methods to receive various types of surface features from the earth surface wave information, and these information processing, and thus identify the nature and movement of material ground state of the integrated technology.
Environmental remote sensing surface features or reflected electromagnetic radiation instrument, called the remote sensors, cameras, scanners, etc. that belong to this category. Vehicles carrying remote sensing devices, called remote sensing platforms such as aircraft, airships and satellites and so on.
Remote Sensing of the content, as applied in the field of the object under study and appears to vary all kinds, but they are by receiving electromagnetic waves to identify and analyze the objectives and the phenomenon of surface. Therefore, the use of remote sensing technology is the use of the electromagnetic characteristics of the object that all objects, because of their different types and environmental conditions, which have a reflection or radiation of different wavelengths of the electromagnetic wave characteristics.
In theory, the whole wave band can be remote, but due to the atmospheric window and the technical limitations, currently only a limited number of bands on the most important band is visible and near infrared bands, in infrared and thermal infrared bands, band and other microwave bands. Band in these remote sensing, electromagnetic properties inherent in the object but also by environmental conditions such as solar and atmospheric effects, and thus to the target remote sensor receives electromagnetic radiation reflected or after the need for correction and interpretation of analysis, to get all in the field of effective information.
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