日本气象厅于1984年着手,把全国大致划分成37 900个约一平方公里方,将各方的月、年平均降水量用8个色段区分,利用全国1938个观测点1953～1976年的平均降水量资料,制成了全国平均降水量网状气象图对没有观测点的地方,则将与气候有关的地形特征值,如纬度、经度、标高、起伏量、倾斜度,距海岸的距离等输入大型计算机进行数值化处理得到插值。 The Japan Meteorological Agency started in 1984, dividing the entire country into roughly 37,900 square kilometers. The monthly average precipitation of each party is divided into 8 color segments. By using 1938 observation points from 1953 to 1976 Average precipitation data, the national mean precipitation network mesoscale weather map for the absence of observation points, the climate-related topographic features such as latitude, longitude, elevation, amount of fluctuation, inclination, the distance from the coast Such as input large computer numerical processing interpolation.