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Have a look at generalization tools such as Expand, Shrink, Boundary Clean and Thin. A combination of these tools should help. For instance Expand followed by Thin in your case should join many of the gaps. What is achievable will depend on how poor your data are. An alternative which could help if you are finding too frequent merger of small areas is to ...


In ArcScan, (even with v9.3) there are a whole load of tolerances to fiddle with, including a "gap closure tolerance". Have you fiddled with these? See ArcScan - batch vectorization In some cases you will have to resort to cleaning these gaps manually.

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