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Any big project involves, first of all, splitting a complex task into smaller ones. If you take a project digitizing large territory, the division into small plots and subsequent digitization is obvious. The problems start when one try to put the pieces together, and this need more detailed discussion.

As a matter of fact, tracing is always rather random. One may say: "I am orderly digitizing road network" but hardly know which line will be selected at the next crossroad. Will it be right or left turn, line continuation upward or downward, and so on?