Generalization of cadastral map based on graphics matching


Road Line based Automated Adjustment
The algorithm for automated adjusting cadastral lines based on given road line is similar with boundary line processing and includes following three parts: 
  • Searching the conflicted cadastral lines based on given local road lines;
  • Moving the conflicted cadastral lines to given local road lines;
  • Related cadastral line adjustment.
Editing Methods
It is very difficult to get the 100% correct result for automated processing. So we need develop some editing tools for modifying the mistakes caused by automated processing. Here we developed a tool for moving cadastral points and related lines based on mouse click. Since other map layers, such as boundary lines, building lines and road lines, are benchmark lines, we do not need to modify them at all. 

Result
According to above presented algorithms, we have developed a system on Windows 98/NT for automated old cadastral map editing. The system main window is shown in Figure 3. The whole processing only need inputting 4 points, then can be automatically working as the following sequence:
  • Cadastral map inputting;
  • Inputting 4 control points and make cadastral map pre-matching;
  • Feature point detection and automated cadastral map matching;
  • Boundary line based conflicted line detection and automated adjustment;
  • Building line based conflicted line detection and automated adjustment;
  • Road line based conflicted line detection and automated adjustment;
  • Editing and output.
Image 3

Figure 3(a). The original cadastral map overlapped with other base maps.


Image 4

Figure 3(b). The final editing result.


Reference
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