On Apr 24, 9:50 am, mark mcclure <[email protected]> wrote: > On Apr 23, 10:55 am, Wally <[email protected]> wrote: > > > If speed & accuracy are important, look at: > > www.polyarc.us/pack > > www.polyarc.us/packer.js > > It really depends on when you need the speed. In my > experiments, packer encodes lines faster than the polyline > encoder *but* the performance of the map after encoding is > much better using the polyline encoder. > > Here's an example > Encode:http://facstaff.unca.edu/mcmcclur/GoogleMaps/EncodePolyline/EncodeAnd... > Packer:http://facstaff.unca.edu/mcmcclur/GoogleMaps/EncodePolyline/EncodeAnd...
I tried these pages on a few more machines and consistently found that Packer encodes faster but that the resulting encoded polylines don't display as smoothly. At the high end, the brand new 3GHz Mac Pro in my office loads both pages quite quickly. The polyline encoder version transitions between levels pretty much instantaneously; the packer version takes several seconds to transition between levels. At the low end, the 1.6GHz PowerPC based macs in an old student lab here requires me to push the "continue script" button 10 times to get the polyline encoder version to load and only 6 times to get the Packer version to load. However, the polyline encoder version requires just a couple of seconds to transition between levels, while the packer version requires several "continue script" button pushes over nearly 20 seconds to transition between levels. I don't know how Packer works so it's possible there are some parameters that could be tweaked to improve the performance. I think it more likely that the polyline encoder, which is based on the well established and widely tested Douglas-Peucker algorithm, accounts for the geometry of the lines more appropriately. Mark --~--~---------~--~----~------------~-------~--~----~ 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 -~----------~----~----~----~------~----~------~--~---
