Drainage basin surface rainfall time sequence calculation method and system based on point-surface fusion

The invention discloses a point-surface fusion-based drainage basin surface rainfall time sequence calculation method and a point-surface fusion-based drainage basin surface rainfall time sequence calculation system. Firstly, the range of a target drainage basin is determined, and longitude and latitude information of all rainfall stations in the drainage basin and corresponding rainfall information are obtained; then constructing a grid chart of the target drainage basin based on ARCGIS, and interpolating rainfall information to corresponding grid points in the grid chart by using inverse distance weight to obtain a grid value corresponding to each grid point; cutting the boundary of the target drainage basin in the interpolated grid chart through a grid cutting tool to generate an interpolation grid; and finally, traversing all grid points in the interpolation grid, and accumulating and dividing grid values corresponding to all the grid points by the grid number to obtain the area rainfall of the target dra