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Measuring method of surface density of meteorological stations

A measurement method and surface density technology, applied in the field of atmospheric science research, can solve problems such as unreasonable surface density, inaccurate statistical methods, unfavorable objective analysis, etc., and achieve the effect of improving the effect

Active Publication Date: 2020-11-13
NANJING UNIV
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Problems solved by technology

[0008] However, this direct definition has several deficiencies: 1. It needs to artificially divide the area or give a statistical radius d, so the result is subjective, which is not conducive to objective analysis
2. The areal density will show unreasonable discontinuous jumps, which will affect the judgment of the areal density distribution and subsequent analysis
3. Usually only the surface density distribution characteristics under a uniform scale d can be obtained, but the actual station distribution varies greatly and presents multi-scale characteristics, which will lead to inaccurate statistical methods based on scattered point data, such as scattered EOF analysis of point data (Wang Panxing et al. 2011)

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  • Measuring method of surface density of meteorological stations
  • Measuring method of surface density of meteorological stations
  • Measuring method of surface density of meteorological stations

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Embodiment Construction

[0042] Let Ω be the total area to be studied. The total number of stations is N. area is a sub-region whose area is S(ω), and there are n(ω) stations in the region, then the number of stations per unit area, that is, the original definition of station area density ρ(ω) is:

[0043]

[0044] In actual use, a circular area with a certain radius d is often selected for statistics, and the sub-area ω at this time is denoted as and have S(ω)=πd 2 , so the areal density at scale d is

[0045]

[0046] in is the coordinates in the total area, and the sub-area ω is taken as A circular region with a center and radius d.

[0047] In order to still have sufficient accuracy near the regional boundary and the region where the station density is greater than the grid, (2) should be written as

[0048]

[0049] Using this formula can directly measure the density of the station, and this method is called the original method hereinafter.

[0050] The original method is i...

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Abstract

The invention discloses a surface density measuring method of a meteorological station. According to the method, a kernel function is used to smooth the station surface density approximately, a localscale and the like are introduced, and an adaptive surface density of the meteorological station is obtained. The method can overcome the problems including subjectivity, discontinuity and single scale of a present station density calculation method, and can satisfy objective station density measurement and further use statistical methods including interpolation and EOF analysis.

Description

technical field [0001] The invention relates to the measurement of the surface density of meteorological stations in the field of atmospheric science research, in particular to a method for measuring the surface density of meteorological stations. Background technique [0002] The areal density of meteorological stations is a basic quantity that reflects the distribution characteristics of meteorological stations, and is widely used. For example, many interpolation methods need to use the areal density of stations (Stahl et al.2006), such as the representative analysis of the observation station network ( Ren and Ren 2012), such as empirical orthogonal function (EOF) analysis of station data (Wang Panxing et al. 2011), etc. The areal density of stations in existing studies is mainly obtained by using the original definition of areal density, that is, dividing the number of stations in a given area by the area of ​​the area: [0003] [0004] its subregion Ω is the tota...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01W1/00G06F17/18
CPCG01W1/00G06F17/18
Inventor 蒋昱鑫王元郭传江明杰宋金杰
Owner NANJING UNIV