Cartographic requirements for the quality of the card content concern apart from the geographical accuracy within defined coordinate systems, especially flawless implementation of sign regulations.

The slope is an important object describing the terrain. In the digital version, you have levels, color numbers, line thickness, etc. to distinguish top (OK), bottom (UK) and hachure. Various CAD programs to draw for drawing can provide these attributes and tools for drawing. To produce the DBWK the Bentleys CAD the Bentleys CAD-system MicroStation is used. The working environment is enriched with many additional tools and applications for this particular graphic work. Nevertheless, mistakes happen: the upper and lower edge defining the hachure direction be confused, especially since the sign rule requires both the same color (!). Or hachures not begin or end exactly at the edges (OK / UK).

In retrospect, these errors can be discovered manually barely. Individual files can contain many hundreds of slopes ...

There can help an automated error flag . VOK.MA The MDL program is an application that was developed for this task. 

The full description of the program can be found at VOK.MA .

Building are hatched according to their importance. The angle of the hatching is either 45 ° or 90 ° to take on the longest side. Th program VHACHA.MA can detect defective hachures and for correction mark.

Now it may happen that hachures (already set in 3D) go in the 2D representation over the boundaries. These unclean places with  VHACHO.MA can be discovered and marked.

Revetment is a design area serving for example the identification of the covering  embankments. When designing are cut small area symbols and the project remains loom wrong over the boundary edges out. Also for these unclean places, there is a MDL to identify and marking MDL VREV.MA .