ABSTRACT
Distinction should be made between two types of situations in which remote sensing data are used. In the first type, a complete experiment is designed and carried out by a team of people who are also responsible for the analysis and interpretation of the data obtained. Such experiments are usually intended either to gather geophysical data or to demonstrate the feasibility of an environmental applications project involving remote sensing techniques. The second type of situation is one in which remotely sensed data are acquired on a speculative basis by the operator of an aircraft or satellite and then distributed to potential users at their request. In this second situation, it is necessary to draw the attention of the users to the fact that atmospheric corrections may be rather important if they propose to use the data for environmental scientific or engineering work.
