Development of Adaptive Thiessen Polygon Method for Imperfect Observation Data

The problem of the low efficiency of the existing spatial interpolation algorithm for hydro meteorological information is discussed and two fast interpolation algorithms based on the conventional Thiessen polygon method was proposed in this paper: improved Thiessen polygon method and self-adaptive Thiessen polygon method. Studies of the Luan River Basin had shown that the self-adaptive Thiessen polygon algorithms are 10–200 times more efficient than the conventional Thiessen polygon method and guarantee calculation accuracy. A comparative analysis of the factors influencing the interpolation algorithm efficiency revealed that the number of grids and stations had the greatest effect on the calculation efficiency, while the number of sub basins was a secondary factor.