Method for recoding second category of product data of Doppler weather radar

A weather radar and product data technology, applied in the field of meteorological data encoding and processing, can solve the problems of large data file size, affecting the download and loading speed of data files, etc., to achieve the effect of improving download speed, saving traffic, and reducing volume

Active Publication Date: 2017-09-01
洛阳市气象局
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  • Summary
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  • Claims
  • Application Information

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Problems solved by technology

[0003] When developing on the iOS side based on the second type of product data, it was found that although the pixel-by-pixel encoding method of the second type of product data can make all product files consistent in size and regularity, it also leads to data files The size is large, and the downloading and loading speed of data files is s

Method used

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Example Embodiment

[0020] The present invention provides a method for re-encoding the second-type product data of Doppler weather radar, which includes the following steps:

[0021] 1). Perform system initialization; after that, go to step 2);

[0022] 2). Read the second-class product data of the Doppler weather radar, which is a binary file compiled according to the third-level archive data format of the next-generation weather radar compiled by the National Climate Data Center of the United States. The data structure of Le Weather Radar’s second category of products can be divided into three parts: product information block, product description block, and product representation block. The data of the product representation block describes the radar product image in a branch and pixel by pixel manner, occupying all The main part of the second product data volume of the Doppler weather radar; the product representation block data consists of multiple data lines: each data line contains a specified numb

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Abstract

The invention relates to a method for recoding a second category of product data of Doppler weather radar. The method comprises the following steps of: after initializing a system, extracting product representation block data which describes a radar product image; then reading the product representation block data row by row and byte by byte; according to each read byte, calculating a color index value and length of each product image color block; in each data row, accumulating the length values of the color blocks which continuously appear and have the same color, and storing the accumulated length values and the color index values in pairs until an accumulated length value is greater than 255 or a color value is changed so as to complete recoding. By adopting the technical scheme of the invention, a storage volume of the second category of product data can be reduced to implement traffic saving so as to improve a downloading speed of the data and a loading speed of a client.

Description

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Claims

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Application Information

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Owner 洛阳市气象局
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