Comparison and improvement of spatial rainfall interpolation methods

A comparison was made on several spatial rainfall interpolation methods commonly used, including the Thiessen polygon method, the reverse distance weighting method and the ordinary Kriging method. In consideration of great influences of the elevation information, it was taken as an influencing factor of the second class, and introduced into the Co-Kriging method for spatial rainfall interpolation, and a new Co-Kriging method was put forward. The application of the three methods, the reverse distance weighting method, the ordinary Kriging method and the new Co-Kriging method, to rainfall interpolation calculation for the Yanduhe River Basin shows that the effect of the last one is obviously superior to the other two methods.