GIS (geographic information system) vector data camouflage and reduction method based on geometric accuracy weakening of elements
A technology of vector data and geometric precision, applied in the field of camouflage and restoration of GIS vector data based on geometric precision weakening technology, to meet the needs of hidden communication and secure transmission
Inactive Publication Date: 2014-04-23
NANJING NORMAL UNIVERSITY
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However, vector data has many characteristics such as data organization without fixed storage order, various data formats, powerful visual expression means, complex projection transformation, various spatial analysis applications, high precision and less redundancy. It makes the information camouflage research on vector data have certain particularity and great difficulty
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[0044] Further detailed description will be given below in conjunction with the accompanying drawings and embodiments.
[0045] In this example, a typical shp surface layer data is selected, and the whole process of data reading, camouflage processing, and data restoration is further described in detail. This embodiment selects the national 1:4 million provincial boundary layer data (such as figure 1 ) as experimental data. The value of the key Key is "10010101". Select the AREA field as the feature attribute field for processing.
[0046] (1) Data masquerade processing.
[0047] Step 1: Open the provincial boundary layer data file, the data format is area data, and the key value is "10010101".
[0048] Step 2: Determine the layer type, if it is surface layer data, then perform the following steps.
[0049] Step three:
[0050] (a) Read the geometric data of 923 points in the first element into the array queue D, and the attribute value of the corresponding AREA field is...
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The invention discloses a GIS (geographic information system) vector data camouflage and reduction method based on geometric accuracy weakening of elements. The data camouflage method disclosed by the invention comprises the following steps of: (1) opening a GIS vector data layer file, reading a name of an attribute field and setting 8-bit binary random information as a Key; (2) judging the type of the layer: respectively reading specified attribute information and geometric information of a point element to a numerical variable a and a point object (Point) against data of a point layer, and weakening the accuracy of a Point value; and reading geometric data of all points in one element to an array queue D against the data of a line-surface layer, reading the specified attribute information of the element to the numerical variable a, and weakening the accuracy of the Point value of each point in the D; and (3) saving the camouflaged data after completing circulating processing of each element. According to the GIS vector data camouflage and reduction method disclosed by the invention, safety of the GIS vector data in data transmission can be effectively improved, and the GIS vector data camouflage and reduction method can be applied to hidden communication and safety transmission of the GIS vector data.
Description
technical field [0001] The invention belongs to the field of geographic information security, and in particular relates to a method for disguising and restoring GIS vector data based on geometric precision weakening technology. Background technique [0002] The security protection of geographic information involves national security and social interests, and is a major national and social demand that needs to be urgently addressed. Especially in today's situation where the demand for spatial data sharing is gradually expanding and the application of geographic information services is expanding, the security issues of geographic information are further highlighted. As the main data content of the National Spatial Data Infrastructure, GIS vector data, its information security research is even more important. [0003] At present, information camouflage has become another important branch besides cryptography in information security research. The analysis of relevant research ...
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IPC IPC(8): G06F21/60
Inventor 李安波闾国年张驰
Owner NANJING NORMAL UNIVERSITY