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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 ...


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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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If you have Adobe Illustrator and the MAPublisher plugin, you can open the PDF in Illustrator and then export it as shapefiles for use in ArcMap


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I removed all the event handlers from my map control, thus effectively paring it back to the core ArcGIS functionality. The map painting issue disappeared. I then added the event handlers back in one-by-one to isolate the problem. The problem appears to be a bug in the ArcGIS control where if a map layer is inserted in the code for the OnExtentUpdated event ...



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