A storage and transmission method of vector position data

Abstract

The invention discloses a method for storing and transmitting vector position data. By tailoring the data format according to the variation range of the position data to be stored, an estimated bit or a data distribution mark is set at the end of the data according to the requirement of data accuracy. bits, achieving millimeter-level positioning accuracy in a 4-byte storage space. Therefore, the method for storing and transmitting vector position data of the present invention reduces the space required for vector position data storage and reduces the amount of data transmission during transmission.

Description

technical field [0001] The invention relates to the field of data storage and transmission, in particular to a method for storing and transmitting vector position data. Background technique [0002] The position and shape data of map graphics or geographic entities expressed in the Cartesian coordinate system are generally stored in vector data. Vector location data generally expresses the spatial location information of geographic entities accurately by recording coordinate values. [0003] Currently, the most commonly used coordinate systems for vector data are WGS-84 coordinate system, J2000 coordinate system, etc. [0004] The coordinate values ​​of recorded position points in the WGS-84 coordinate system are generally longitude lon, latitude lat and altitude alt, where the units of longitude and latitude are generally degrees, and the units of altitude are meters. [0005] The coordinate values ​​of the recorded position points in the J2000 coordinate system are gener...

AI Technical Summary

Problems solved by technology

In the digital storage and transmission system, the vector position data is stored by the value of the float type. Since the value of the float type usually has only 7 effective digits in the computer, the longitude value lon=123.6592465636 and the latitude value lat= 29.9840453269, height value alt=2764.9015569712 such precise vector position data, using float type to store, can only get longitude value 123.6592, latitude value 29.98404, height value 2764.901, each component value can only store 7 valid digits, the following The values ​​will be lost, and we know that the distance error dT=1.1131949 meters caused by the deviation of longitude 0.00001 degrees on latitude 0 degrees, the stored data accuracy is not high

[0007] In order to further improve the accuracy of the data, the existing method generally uses the value of the double type for storage, but this will double the data space and increase the cost of storage and transmission

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