Run expression and operation-based map drawing method

A travel and map technology, applied in the field of vector map representation, can solve the problems of low efficiency of travel operation, low accuracy of travel expression, inconvenience, etc., and achieve the effect of being beneficial to map editing, improving access speed and saving time.

Inactive Publication Date: 2010-09-15
NANJING UNIV
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AI Technical Summary

Problems solved by technology

This data structure can effectively compress the raster, but it is quite inconvenient when performing other operations. The positioning, insertion, deletion, and merging under run-length encoding need to traverse the...

Method used

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  • Run expression and operation-based map drawing method
  • Run expression and operation-based map drawing method
  • Run expression and operation-based map drawing method

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Embodiment Construction

[0033] This embodiment is based on the map forming method of run-length expression and operation, such as figure 1 As shown, the map forming method based on run-length expression and operation, its data support layer includes spatial database and map symbol library, and the specific mapping steps are as follows:

[0034] The first step is to extract data from the spatial database and organize it hierarchically to form a collection of vector layers;

[0035] The second step is to insert the corresponding map symbols in the map symbol library into the vector layer to complete the symbolization of each element in the vector layer;

[0036] The third step is to transform the symbolized map symbols in each layer into a run-length set composed of run-length units through the line scanning method, and the map symbols in the layer correspond to the run-length set;

[0037] The fourth step is to perform a superposition operation on the run-length units on the same map grid row according...

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Abstract

The invention relates to a run expression and operation-based map drawing method and belongs to the technical field of vector map expression related to computer mapping. The map drawing method comprises the following steps of: (1) extracting data from a spatial database and carrying out layering organization to form a vector layer collection; (2) symbolizing each element in vector layers; (3) converting symbolized map symbols in each layer into a run collection consisting of run units; (4) carrying out superposition operation on the run units positioned on the same map raster line in a superposition order of the layers; and (5) decoding the superimposed run collection to complete map output. The map symbols in the layers of the invention are expressed by the run, thus, the method has the advantages of small occupied resources, rapid superposition operation and high map drawing efficiency; and each layer is converted into a plurality of run collections corresponding to the map symbols one by one respectively so as to improve the access speed of the map symbols in the layers and contribute to inserting and deleting operation of the map symbols.

Description

technical field [0001] The invention relates to a map forming method based on run length expression and operation, and belongs to the technical field of vector map expression related to computer graphics. Background technique [0002] With the increasing popularity of GIS application technology, the application of digital maps is becoming more and more extensive. The corresponding computer mapping methods have changed the traditional manual mapping methods, and can meet various map needs with the support of databases. The vector area map expresses the surface objects by recording the coordinates of the boundary points and the composition of the boundary, which can be regarded as recording the outline of the objects. In the drawing stage, this vector data must be transformed into raster data and output after being symbolized. [0003] The data layer of existing map mapping methods generally consists of two parts: a spatial database and a map symbol library. As the data suppo...

Claims

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Application Information

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IPC IPC(8): G06T11/00
Inventor 王结臣蒲英霞姚良马劲松陈刚
Owner NANJING UNIV
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