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Method for estimating lightning density distribution and annual average ground flash density (NG) value by kernel density estimation

A technology of kernel density estimation and density distribution, applied in the intersection of GIS and meteorological information technology, can solve the problems of redundant information, unintuitive and distinct disaster distribution situation, huge space, etc., and achieve the effect of improving statistical efficiency.

Inactive Publication Date: 2011-11-23
NANJING UNIV OF INFORMATION SCI & TECH
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Problems solved by technology

Therefore, when the original data of lightning is stored in the form of text records, the space is huge and the information is redundant, and its disaster distribution is not intuitive and clear.

Method used

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  • Method for estimating lightning density distribution and annual average ground flash density (NG) value by kernel density estimation
  • Method for estimating lightning density distribution and annual average ground flash density (NG) value by kernel density estimation
  • Method for estimating lightning density distribution and annual average ground flash density (NG) value by kernel density estimation

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Embodiment Construction

[0033] like figure 1 As shown, the present invention adopts the lightning density distribution and NG value statistical method of kernel density estimation, including the following steps:

[0034] (1) Read the time, location information, attributes and other information in the lightning data database to form a set of point space elements;

[0035] (2) Determine the smooth bandwidth, calculate the lightning density calculation scale and density function, and obtain the lightning density collective;

[0036] (3) Render the lightning point vector layer according to the density value, and cut the appropriate layer according to the condition area;

[0037] (4) rasterizing the vector layer, and cutting the raster layer according to the above-mentioned condition area;

[0038] (5) Calculate the area of ​​the area selected by the user and the number of lightning in the area, obtain the NG value of lightning, and display the final density map and numbers comprehensively.

[0039] Th...

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Abstract

The invention discloses a method for estimating lightning density distribution and annual average ground flash density (NG) values by kernel density estimation. The method comprises the following steps of: 1, constructing and maintaining a thunder and lightning space database and establishing a thunder and lightning real-time positioning monitor system by combining the geographic information system (GIS) technology to acquire the source of information on the occurrence of thunder and lightning, and displaying the positioning distribution of the lightning in real time in a space element mode; 2, acquiring the distribution of regional lightning density by a kernel density estimation process, and cutting graph regions which are selected by users and are used as condition layers to form a regional density distribution map and eliminate an edge effect; and 3, calculating a total regional area (kilometer) and annual total lightning time of the kernel density estimation to solve the NG values of the corresponding regions and form a weather product which combines the lightning density map and the numerical values, and releasing and sharing a thunder and lightning data analysis product by a sharing network finally. The fundamental aim of thunder and lightning service is fulfilled by the lightning density statistical method.

Description

technical field [0001] The invention belongs to the cross field of GIS and meteorological information technology, and the power of the geographic information system (GIS) is that it can digitally store the spatial geographic distribution status and its attributes, establish a data management system, and develop various analysis and processing functions at the same time. In order to obtain information quickly, and express the processing results in the form of maps, primitives and data. Therefore, to deal with massive and complex real-time lightning data information, it is necessary to obtain the regional lightning density distribution and lightning NG value through an accurate and fast method, which provides a scientific means for the analysis and decision-making of lightning protection, and greatly improves the lightning protection in various forms. Statistical efficiency of the data. Background technique [0002] The occurrence of lightning in nature is very random, instan...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F19/00G01W1/16G01R29/08
CPCY02A90/10
Inventor 侯荣涛朱斌史鑫明
Owner NANJING UNIV OF INFORMATION SCI & TECH
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