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A method of thinning and smoothing based on vector map data

A technology of vector map data and smoothing processing, applied in image data processing, image enhancement, image coding, etc., can solve problems such as loss, and achieve the effect of improving the display effect

Active Publication Date: 2016-07-06
XIAMEN YAXON NETWORKS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

Inadequacies Reserve redundant points for missing some important nodes

Method used

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  • A method of thinning and smoothing based on vector map data
  • A method of thinning and smoothing based on vector map data

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Embodiment Construction

[0021] A method for thinning and smoothing processing based on vector map data of the present invention mainly includes the following two steps:

[0022] Step 1. Reduce the amount of data by thinning out the curve feature points;

[0023] Step 2. Solve the problem of protruding edges and corners by smoothing the closed curve feature points.

[0024] The specific steps of the feature points of the thinning curve are as follows:

[0025] Step 11, load the geographical coordinates (longitude and latitude) of the curve feature points in the vector map data into the array, and set the thinning state identification iDel for each curve feature point, except the thinning state identification iDel= In addition to 1, the thinning state flag iDel of other feature points is initialized to 0 before thinning and smoothing. Among them, thinning state flag iDel=0 means thinning is allowed, thinning state flag iDel=1 means reserved point, The thinning state flag iDel=-1 can be deleted. If th...

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Abstract

The invention a data rarefying and smooth processing method based on a vector map. The method mainly comprises the following steps: the data volume is reduced by rarefying curve characteristic points, and the protruded edge problem is solved by smoothly processing closed curve characteristic points. The curve characteristic points are compressed by setting different segment length threshold values, angle threshold values and vertical distance threshold values, and unsmoothed broken lines are smoothly processed through the smooth processing algorithm, so the display effect of closed curves having disadvantages of large curvature change and protruded edges can be effectively improved.

Description

technical field [0001] The invention relates to a method for thinning and smoothing processing based on vector map data. Background technique [0002] Geographic Information System (GIS) is more and more widely used in various fields, but massive data not only takes up a lot of storage space, but also affects the processing speed of data when it is used. Therefore, data thinning has become a solution to reduce redundant data, save data space, and improve processing speed. At present, the commonly used thinning algorithms include the Douglas-Pucker method, the vertical distance method, etc. Different thinning algorithms have their own advantages and disadvantages. [0003] Principle of Douglas-Puke method: select the first and last points of the curve (for a closed curve, the leftmost and rightmost feature points are the first and last points of the curve), find the maximum vertical distance from the other points in the curve to the imaginary line connecting the first and la...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T5/00G06T9/00
Inventor 林秋芳季刚陆萍秦科元
Owner XIAMEN YAXON NETWORKS CO LTD
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