Client-server vector cartographic system.

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Screen shots

• general view of the program;
• object selection on the map (magnifying glass with sight can be seen);
• residents of a given apartment in a selected house;
• land and its tenant;s
• calculation of the number of residents on the given territory;
• working with layers;
• document printing preview;
• insertion of a cartographic object into the Visual Basic project.

Functions:

• vector graphics;
• multi-user mode;
• storage of data on the database server;
• division of graphic objects into layers according to their types;
• user authentication according to domain NT, 2000 budget account;
• distribution of the user access to the layers (reading, recording);
• caching of the received information on the client’s side and blocking of its repeated sending in order to reduce network traffic;
• database alterations versions tracking procedure and synchronization with client’s cached information in order to secure data authenticity;
• network traffic minimization: transmitted is only the data on the objects situated in the rectangular questioned by the user, only from the layers to which the user has authorized access for reading, only from the layers questioned by the user and the layers that have not been passed to the client yet;
• database server utilization minimization;
• cartographic data is linked with tables from other projects: buildings, residents, land owners;
• searching for people and their registration address, land owners, enterprises and trade outlets owners is available.

Realization:

• data is stored in MS SQL 6.5;
• server code is implemented on C in the form of advanced stored procedures MS SQL. DB-lib, ODS;
• client application is implemented on Visual C++;
• OCX block version is available for cartographic functions usage in other program projects.