Point-drawing graph filling method of meteorological and hydrological data of specific area

The invention discloses a point-drawing graph filling method of meteorological and hydrological data of a specific area. Spatial layering is carried out in advance on sites, and according to display granularity of height of each layer, a set of sites which can be clearly displayed by the layer of the height in a case without site covering is determined; according to selected height and the selected display area, sites falling in the selected display area are selected from a set of sites, which correspond to the selected height, in actual display for display of the meteorological and hydrological data; and for any site, graph filling processing is carried out on meteorological and hydrological data of the site only when the site first appears in the selected display area. By using the method, reasonable-density graph filling can be realized according to actual graph filling quantity and a scaling factor of a base graph. 本发明公开了种特定区域气象水文资料抽点填图方法，预先对站点进行空间分层，根据每层高度的显示粒度，确定无压站情况下该高度层能够清楚显示的站点集合；在实际显示时，根据所选高度和所选显示区