In addition to the existing raingauge networks, for the 2003 observations special instruments were installed jointly by universities at home and abroad. Pukyong National University in Korea provided two networks. One of them, Network 1 (Fig. 7), comprises four tipping bucket raingauges placed about 10 km away from the radar with a spacing of about 300 meters. The rainfall intensity in space, which the radar measures, can thereby be obtained. The other, Network 2, comprises four raingauges placed in a mountainous area, on a straight line from the radar. Network 2 was put in place so as to confirm the accuracy of rainfall estimates for mountainous areas. Such raingauges have a resolution of 0.1mm, and a sampling interval of one minute. In addition to these networks, three impact type disdrometers were deployed, with which devices raindrop size distributions can be measured. Furthermore, a 2D-video disdrometer, which enables the measurement of raindrop size, was deployed by Colorado State University.

Network comprised of specially prepared raingauges and disdrometers (2003).

(a) 2D-video disdrometer placed on the rooftop of the NIED Hiratsuka Testing Yard (Hiratsuka, Kanagawa). (b) One-minute interval data recording tipping bucket raingauge and impact disdrometer placed at the same location.