A Twice Interpolation Method for Daily Temperature Based on DTW

1.Shandong Meteorological Data Centre;2.Fujian Meteorological Information Centre

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Shandong Meteorological Bureau Key Scientific Research(2021sdqxz02); Shandong Meteorological Bureau Youth Scientific Research(2021SDQN03)

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    As the most basic physical quantity for studying on climate evolution, the integrity and accuracy of daily temperature series are of great significance for climate analysis and assessment. In recent years, with the deployment of a large number of unmanned ground intensified automatic weather stations, missing data with double random characteristics such as random distribution of stations and random lengths of series, which poses significant obstacles to climate analysis and operational applications. In view of the shortcomings of the existing methods for meteorological data interpolation, a new twice interpolation method of daily temperature data based on dynamic time warping (DTW) is proposed in this paper. The method adopts a real-time interpolation strategy, which mainly includes: (1) The method decomposes the temperature observation time series into a fitted straight line and a residual curved line by using univariate linear regression equation, and recomposes new temperature series by combining the two lines; (2) The method provides the definition and interpolation conditions of temperature interpolation areas; (3)The method proposes a new model for calculating the distance between stations by DTW . The collecting temperature data from Shandong Province in 2021 is used to test the method, and the test results show that the method can meet the interpolation needs of daily temperature data with double random characteristics, and the combination method of DTW distance and twice interpolation in the interpolation process can achieve a better effect than any of the other combination based on site geographical proximity relationships; the method is sensitive to terrain, and the interpolation effect in plain or hilly area is better than that in mountainous area.

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  • Received:November 30,2022
  • Revised:May 18,2023
  • Adopted:June 09,2023
  • Online: November 17,2023
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