Earth observation from space

Remote Sensing is a technology to observe objects' size, shape and character without direct contact with them. The reason why they can be observed without contact because of the characteristics of electromagnetic waves, such as light reflected or radiated from the objects. These reflected or radiated electromagnetic waves are received by sensors aboard earth observation satellites.

In general, the characteristics of reflected or radiated electromagnetic waves depend on the type or condition of the objects. Therefore by understanding the characteristics of electromagnetic waves and by comparing to the observed information, we can know the size, shape and character of the objects.

There are some characteristics of remote sensing by earth observation satellites. Applying these characteristics, the observation data are utilized for various studies related to the earth environment as well as various fields affecting to our lives.