Remote sensing and geographic information systems for design and operation of water resources systems : proceedings of an international symposium (Symposium S3) held during the Fifth Scientific Assembly of the International Association of Hydrological Sciences at Rabat, Morocco, from 23 April to 3 May 1997 / Edited by Michael F. Baumgartner, Gert A. Schultz, A. Ivan Johnson ; jointly convened by the IAHS International Committee on remote sensing and data transmission and the IAHS International Commission on Water Resources Systems / Wallingford : IAHS Press , 1997