Reduce number of points definitely will help. But I don't know how much I can improve from a polygon with 300K points. So, I am more interest in Map tiles.
I watched John Coryat's workshop video. It is an eye-opener. But I am still not quite fully understand yet. Before I dive into the codes and samples. I like to know the feasibility of Map tile solution to my application. I have a Windows application (.NET/C# and my background is primary in the MS shop). The Map part is using a WebBrowser Control (IE behind the scene) to show the Map. I need to show the Market boundaries on the map. The boundaries will be static (may change once in several years). I like to show all the boundaries of a country. And, if possible, highlight the CURRENT market in some way. While map tiles maybe a solution for me, it seems to me there are too many tiles needs to be created. (I am doing this for a major chains store which is make development around the world). I also need to get down to the street level in metro areas. Can I only create tiles that contains the points of the polygons? Do I have to provide tiles at every zoom levels? Again, the above is my requirement. I don't have super power web server. Is it feasible to do it with Map Tiles? Thanks. jzerohn On Jul 31, 11:36 am, Dan Glantz <[email protected]> wrote: > John Coryat actually gave me some good advice for a similar problem a couple > days ago. > Try simplifying your polygon data using Douglas Peucker before encoding it. > > On this page:http://www.bdcc.co.uk/Gmaps/Services.htm > > <http://www.bdcc.co.uk/Gmaps/Services.htm>I found this > JS:http://www.bdcc.co.uk/Gmaps/GDouglasPeuker.js > > <http://www.bdcc.co.uk/Gmaps/GDouglasPeuker.js>Which I used to simplify my > polygon data before encoding (351 polygons, almost a hundred thousand > points), and it's a lot faster now. I still have to use Google Maps Flash; > most browsers just can't render this much data with any speed. > > There is a tradeoff; the more accurate, the slower. But if you have polygons > that touch each other like city boundaries, then the less accurate the > polygons are, the more they'll overlap and look bad. Try running the > algorithm on your data a few times, playing around with the Kink level, to > try to hit the sweet spot between accuracy and speed. > > Good luck, I'm going to try to post what I've done with this when I get a > chance. Here's the map I'm working > on:http://www.theformsproject.org/index.html > > I set my kink level to 20 meters, I bet I could simplify it a little more. > 240 meters was a faster, but I had overlappers. > > Danhttp://www.eot.state.ma.us/developers/ > > > > On Fri, Jul 31, 2009 at 12:11 PM, Rossko <[email protected]> wrote: > > > > One thing I noticed is the Map tile. But I am unclear how to do this. > > > Start with John Coryat's workshop > >http://www.youtube.com/watch?v=IYqfT9i1las --~--~---------~--~----~------------~-------~--~----~ 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 -~----------~----~----~----~------~----~------~--~---
