The principles of Earth observation|
In order to be able to understand the application of satellite data, information of for instance, light, radiation, instruments, availability of data and interpretation of satellite information is necessary.
|The electromagnetic spectrum|
|Electromagnetic radiation is equipped with energy transferred through empty space or a permeable medium by electromagnetic waves.|
|Earth observation satellites are equipped with instruments suitable for observation or studies of the surface of the Earth (land/sea) and/or the atmosphere. |
|A satellite in an orbit about 300 km high takes about 90 minutes to orbit around the Earth. The moon, at a distance of about 384.400 km, takes somewhat more than 27 days.|
|Availability and readout of satellite data|
|Satellites in a polar orbit have normally a period around the Earth of about 100 minutes, and make more than 14 such orbits a day.|