On Aug 29, 7:01 am, buttman <nbvf...@gmail.com> wrote:
> I want to add a feature of my application where the user can upload a
> big set of data, and then my application will analyze the data and
> show on a google map as a bunch of line segments. There will be
> hundreds, if not thousands of line segments being rendered. Obviously
> using the javascript polylines method is not ideal. Whats the best way
> to go about attacking this problem? I already have a working
> GTileOverlay implementation going for displaying a bunch of points.
> Has anyone tried using the GTileOverlay method working for line
> segments?
>
> If I just had it so my application outputs a KML file, will that be
> just as bad as using javascript polylines, or will that be a little
> better performance wise? Sometimes when I load a KML file into google
> maps, it seems as if the KML file gets rendered much like how
> GTileOverlay's get rendered. It's almost as if the KML file gets sent
> to Google, then returned back as 256*256 square PNG's along with the
> rest of the data images. Is this how it actually works, or am I crazy?
Google's mapsdt / mapslt server will actually cut tiles for you.
Tiles are cacheable both locally & at Google's server. The trick is
to figure out the right set of conditions to force the mapsdt / mapslt
server to be used (legally). Sometimes GGeoXml will use it.
Sometimes it will not. It depends on your browser. It also depends
on the complexity of your KML file. I do not know the magic formula.
I have submitted an issue to be able to force the use of mapsdt /
mapslt but it has not happened.
For what it is worth, I have an experimental "Light Weight Poly"
facility for V3. It can render polys with over 100,000 vertices. It
uses CANVAS elements cut into tiles. Look at:
www.polyarc.us/polycluster
www.polyarc.us/polycluster/alaska.html
www.polyarc.us/polycluster/absurd.html
www.polyarc.us/polycluster/canada.html
www.polyarc.us/polycluster/east.html
www.polyarc.us/polycluster/west.html
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