There are 2 groups of electromagnetic waves is.1. remote sensing system using Passive common from the beginning until now, with the birth of natural energy source is the Sun as a source of energy in this system to receive and save the data. Mainly in the daytime, there are limitations and deficiencies of air. Failed to get information for the FON, or when there is a haze of rain.2. remote sensing is an Active source of energy caused by a system created in a wave of exploration, for example, range, microwave, built in Kedah, the power transmission system for resin to the target area. This system can be made to obtain and record the information without any restriction in time or the weather conditions, is able to receive the signal in both day and night can also pass through haze of rain in any season, the first system for passive remote sensing range has been developed before, and are still widely used today. Active remote sensing systems section has developed from a military band, and then publish the Civil Affairs during the technology behind exploring it more attention, especially with the countries in the tropical haze covered the issue.
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