Abstract
Applications of remote sensing and geographic information systems (GIS) to hydrology are described. They are important techniques for hydrologic applications and can contribute to human life. The targets of hydrology range from the local to global scale. Global scale involves a number of local regions. Each region has peculiar variability and interrelationships of the components, of a spatial and historic nature, and they form regional characteristics. To achieve the outcomes that contribute to human society, a viewpoint based on the region is necessary. At the same time, the outcomes that will help international exchanges will be achieved by locating the regional experiences in the global context. Such an application will be realized through a knowledge base constructed using GIS.
