ABSTRACT
The philosophy behind the gathering of remote sensing data is rather different in the case of satellite data than for aircraft data. Aircraft data are usually gathered in a campaign that is commissioned by, or on behalf of, a particular user and is carried out in a predetermined area. They are also usually gathered for a particular purpose, such as making maps or monitoring some given natural resource. The instruments, wavelengths, and spatial resolutions used are chosen to suit the purpose for which the data are to be gathered. The owner of the remotely sensed data may or may not decide to make the data more generally available.
