To clarify the spatial characteristics of rain-gauge network over Japan, we studied some characteristics of rain-gauge network over Japan using available data observed by the Japan Meteorological Agency (JMA), the Water and Disaster Management Bureau under the Ministry of Land, Infrastructure, Transport and Tourism (WDMB-MLIT) and Local Government (L-Gov). Additional spatial analysis was also used available digital national land information (DEM, topographical slop, land use, surface geology, major road, natural park). As a result of spatial analysis using some digital national land information and observation blank zone, more than altitude 500m area couldn't be installed rain-gauge stations. Some observation blank zones have been topographical slop were rich in ups and downs. Rain-gauge stations weren't installed in only limited land use or surface geology. Moreover, many rain-gauge stations tend to be installed near the major road. Therefore, some observation blank zones could install rain-gauge stations.
