气象应用。分别对x,y,p方向进行空间差分，并对缺值部分进行插补（因为资料可能来源于站点插值，一些网格没有资料）-Meteorological applications. X, y, p direction spatial difference, and part of the interpolation of missing values ​ ​ (because the data may be derived from the site interpolation gri