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The Research and Application of the Web Map Issuing Technology


The integration of the data of the system

The integration of the map data
Although maps can be drawn with the software CorelDraw, Flash MX does not support the .cdr format. Fortunately, both CorelDraw and Flash MX can import and export the .ai files. Therefore, the following transformation is necessary:

Dealing with the cartographic data of the .cdr file Regarding the restriction of the bandwidth of the Internet and of the display area, geographic elements of cartographic data need to be simplified and abstracted before they are displayed. After technical processing, the .cdr files are exported as the .ai files in order to integrate data into Flash MX.

Inputting the .ai files to the Flash MX software The most basic element of Flash MX is the MovieClip. The cartographic data layers with the format .ai are firstly transformed as the MovieClips, then they are imported into the Movieclip library of Flash MX and are given specific names in order to be managed by the ActionScript programs.

Integration of non-geometric data
In addition to the geometrical data, non-geometric data also need to be integrated into the system. They include navigational entries, information about the areas, information about the enterprises, etc.

Realization of the system functions
In order to realize the aim of “offering the users with the combination of various enterprise’s information and the spatial information in a more direct way”, the system contains the following functions:
  2. Display of maps: bird’s-eye view, controlling of the coverages, zooming out, zooming in, roaming, showing a whole map, displaying the map scale, printing
  3. Query for information: retrieving the information of the enterprises by regions, by types, or by key words
  4. Display of non-geometric information: including the names, the addresses, the types, the telephone numbers, the fax numbers, the homepages and other information of the enterprises
  5. Other functions: for help information, map legend, declaration of the copyright, joining our team, correcting the errors of the map, sound effect
Issuing the Information through Internet
While the cartographic data were integrated into the system and all of functions were implemented by the actionscript which functions in the background of the system, the information of all the enterprises are transformed into .swf files to facilitate the transmission of the vector stream for issuing the information through Internet. The client can use anyone of the following browsers: IE, Netscape, or Flash Player, if he downloaded the plug-in Flash Player beforehand.


Figure2. the snapshot of the web map issuing system


Conclusion
“The Web Map Issuing System of the Main Enterprises of the Shezhen City” allows the users to conveniently find the position of the enterprises in many ways and they can get important information of these units. The system can perform the operation of display the maps; can open the enterprises’ homepages when the users click their point positions; can print the current content on the screen; can also receive the feedback from the users for updating or correcting the cartographic information of this system. Under the current network conditions, the system satisfies ordinary people’s needs for the cartographic information through the Internet. The system also promotes the popularization of the web maps and has fulfilled the task of this project.

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