Electromagnetic waves are 2 large group is 1
.He Passive remote sensing system is used widely since the beginning to the present by an energy source that occurs naturally. The sun is the source of energy. This system will receive and log data, mainly in the daytime.Can't get in the rain or when there are clouds, fog, rain
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2.He Active remote sensing is a system power source caused by the build up of survey instruments, such as ช่วงคลื่นไมโครเวฟ created in the system of the radar. Then send the energy to the target area. This system can be received and recorded data.Or the climatic condition. Is able to send and receive signals, both day and night. It also can penetrate clouds, fog, rain in every season in early passive system remote sensing developed before.The system active remote sensing has developed from military. Then published this technology to civil affairs in the period after the exploration in this field has been more and more attention, especially in tropical countries with the clouds. The mist covered regularly.
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