Application of space sciences to hydrology and water resources: The potential and practical use as reflected by WMO experience

Observations from spacecraft have already proved their worth in a number of fields and much work has been undertaken to develop their use in studies of hydrology and water resources. The ability to obtain areal estimates of parameters over large areas as opposed to only point values and the inherent computer-compatibility of the data obtained are only two of the many advantages which may be stressed. However, any new technology requires the expenditure of scarce financial resources, not only on the system itself but also on associated activities. A full use of space observations in hydrology and water resources will require major changes in existing data collection, storage and processing systems. The net benefits to be gained from such changes must first be demonstrated to those responsible for these systems. A dialogue should therefore be established between those supplying the data and investigating their potential uses, and those actually engaged in the assessment and management of water resources. Examples are offered of projects in which space observations are being used and information is given on requirements for work in hydrology and water resources for data acquired by space observation.