Mike, The problem with D-P and common borders is due to the direction the algorithm takes when simplifying the border. For neighboring polygons, the algorithm will go in opposite directions for every common line. You can see this yourself by just tracing the border with your finger around one polygon, then do the same with its neighbor. D-P will calculate different simplification results depending on where it starts, so slivers and other issues are inevitable. The only way around this, and it can be done, is to determine common borders, break them into lines, simplify them one at a time, reassemble the polygons, check for invalid results (crossing lines, etc.), fix those and you're done. Sounds easy, doesn't it?
While it does sound daunting, if you start with the base geometry, the Tiger edges shapefile, and simplify that before building the edges into larger shapes, the results are easier to deal with. -John Coryat http://maps.huge.info http://www.usnaviguide.com --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Google Maps API" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/Google-Maps-API?hl=en -~----------~----~----~----~------~----~------~--~---
