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Document mode-based GML compression method

A compression method and document technology, which is applied in special data processing applications, instruments, electrical digital data processing, etc., can solve problems such as compression of three-dimensional geometric coordinate data and time coordinate data, etc.

Inactive Publication Date: 2012-01-25
TONGJI UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

However, the latest version of GPress only encodes two-dimensional geometric coordinate data, and does not consider the compression of three-dimensional geometric coordinate data and time coordinate data

Method used

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  • Document mode-based GML compression method
  • Document mode-based GML compression method
  • Document mode-based GML compression method

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Experimental program
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Embodiment Construction

[0033] 1. GSC system structure (GML compressor)

[0034] The document schema-based GML compressor consists of five parts: document schema extraction, tree automaton construction, document verification, document encoding, and back-end text compression. The system structure of the compressor GSC is as follows: figure 1 shown. When inputting a GML document to be compressed, GSC performs the compression as follows:

[0035] (1) Extract its tree-type document mode, that is, the document mode in RELAX NG format, and store it in the structure container;

[0036] (2) Establish a schema tree automaton according to the document schema;

[0037] (3) verify the original document with the pattern tree automaton;

[0038] (4) Carry out bit encoding to each state transition selection of the tree automaton, and store it in the structure container; carry out incremental encoding to the coordinate data item, store it in the coordinate container, and store other data items in the text contain...

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Abstract

The invention belongs to the technical field of space information acquisition and processing in information technology, in particular to a document mode-based GML compression method. The method comprises the following steps of: separating a structure from data and expressing the structure by using a document mode and a status switching selection code of a tree automaton in a mode verification document process; and separating spatial data from non-spatial data and performing incremental encoding on coordinate geometry data. Therefore, a large amount of redundant information is removed and the volume of a GML document is reduced effectively.

Description

technical field [0001] The invention belongs to the technical field of spatial information acquisition and processing in information technology, and in particular relates to a method for compressing geographic data in GML format used for data exchange between heterogeneous geographic information systems. Background technique [0002] With the continuous maturity of Geographic Information System technology, there are more and more GIS applications in specific fields, such as agricultural and forestry resource management GIS, urban planning GIS, emergency response GIS and so on. In order to meet the needs of geographic information sharing and interoperability under the Internet environment, geographic data has to be exchanged between various GIS. However, the data formats of these GIS are different. The more common ones are Mapinfo (*.MIF) data format, AutoCAD (*.DWG, *.DXF) data format, ESRI Shap (*.SHP) data format, etc., lacking a unified coding standards. If the exchange...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/30
Inventor 关佶红魏勍颋周水庚朱付保
Owner TONGJI UNIV
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