KML works for small numbers of polygons only, once you get past a certain point, the map renders slow and there is a limit to the number of polygons that can render in KML on a Google Map, or at least there used to be.
Your first task will be to locate a suitable zip code polygon database. The Census's Tiger site has shapefiles for 2003 ZCTA's which approximate zip codes in a rough way. If your budget is limited or want to get started without investing a lot of money, this is a good way to go. Purchasing a server license to a USPS Zip Code Polygon database is going to run between $2000 and $15000 depending on the provider, so if you want better than Tiger's data, it will cost quite a bit. >From your description, a method like this might be a good candidate: http://maps.huge.info/zipcolors.htm This one takes a radius (or modified polygon) and displays the zip codes that are contained by it. A similar system using your service areas would also work. If you can combine the zip codes involved with your service area into a single polygon, then KML or GPolygon would probably be suitable. -John Coryat http://maps.huge.info http://www.usnaviguide.com http://www.zipmaps.net --~--~---------~--~----~------------~-------~--~----~ 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 -~----------~----~----~----~------~----~------~--~---
