A method and device for reducing the accuracy of vector polygonal spatial data
A technology of spatial data and polygons, applied in the field of geographic information systems, can solve problems such as edge jaggedness and changes in the topological relationship of graphics space, so as to reduce the phenomenon of jaggedness, avoid image distortion, and maintain the original topological relationship and basic characteristics of the data Effect
Active Publication Date: 2019-06-14
CHINA UNIV OF GEOSCIENCES (WUHAN)
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However, when reducing the precision of vector polygonal spatial data spots, the traditional error random interference method cannot well maintain the original basic characteristics of the data, and it is easy to cause changes in the topological relationship of the graphic space and edge jaggedness
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[0067] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art fall within the protection scope of the present invention.
[0068] This embodiment provides a method for reducing the accuracy of vector polygon spatial data, such as figure 1 Shown, including:
[0069] Step 101: Open the vector polygon spatial data file, obtain the vector polygon spatial data, perform lossy compression on the vector polygon spatial data, and obtain the polygon compressed data containing only the feature points. For each polygon in the compressed data, obtain the polygon The original coordinates of each point...
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The invention discloses a method for reducing the accuracy of vector polygon space data. First, lossy compression is performed on the vector polygon space data to obtain polygon compression data containing only feature points, and the original coordinates of each point in the polygon are obtained; according to The coordinates of the original point generate a pseudo-random seed, and the offset direction of the original point is obtained by operating the pseudo-random seed; the pseudo-random seed is used to generate a random number, and the random number is scaled to a preset accuracy range; according to the bias Offset the original point coordinates by the shifting distance and offset direction to obtain the offset point coordinates; after offsetting all point data of each polygon in the vector polygon space data, output the vector polygon space data with reduced precision. .
Description
Technical field [0001] The invention relates to the technical field of geographic information systems, and in particular to a method and device for reducing the accuracy of vector polygon spatial data. Background technique [0002] At present, a large amount of vector polygon spatial data has been accumulated in the field of land and resources management, and these vector polygon spatial data may contain secret spatial locations of geographic elements. In order to ensure that the vector polygon spatial data can be shared under the premise of confidentiality, the vector data to be shared is usually declassified, and the spatial location accuracy and attribute content of the secret-related geographic elements in the secret-level surveying and mapping results are converted to conform to the public surveying and mapping Results. Usually, the method of reducing the accuracy of the vector polygon spatial data is adopted, that is, the coordinate position of the vector geographic data i...
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IPC IPC(8): G06T3/00
CPCG06T3/04
Inventor 王勇廖洪艳刘珍伶
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)