Abstract
In this study, we analyzed the accuracy of 1-km mesh Radar-Raingauge analyzed precipitation transmitted by the Ministry of Land, Infrastructure, Transport and Tourism. This analysis was compared with Radar-Raingauge analyzed precipitation and precipitation data observed by 498 rain gauges installed by East Japan Railway Company in Kanto, Koshin-etsu, and Tohoku regions. As a result, within a 1-hour rainfall, the majority of cases showed close correlation between precipitations provided by Radar-Raingauge analyzed precipitation and by rain gauge, but there were also cases of divergence. Furthermore, precipitations provided by Radar-Raingauge analyzed precipitation tends to average 10 % less than those provided by rain gauges. However, within a 24-hour rainfall, precipitations were closely correlated and on average were practically equal. It should also be mentioned that we found differences in accuracy depending on geographical area; some areas were more closely correlated than others.
