Re: Reduce the number of points in each zoom level

Hi Sir

I am using the polygons from US Census Bureau.
Is that Outdated? Where I can get the accurate one?
Once again thanks for help.. :)

On Nov 17, 1:48 pm, Marcelo <marcelo...@hotmail.com> wrote:
> Making tiles takes time.
> D-P is not going to speed it up very much at it will lower the quality
> of your polygons.
> I am also creating zipcode tiles for a client, and to give you an
> example, at zoom 13 the state of Colorado alone takes about 1 hour.
> This is using USNaviguide's up to date polygons:http://maps.huge.info/zip.htm
>
> If you're using the (outdated) "generalized polygons" from the US
> Census Bureau, the have already applied D-P to those.
>
> --
> Marcelo -http://maps.forum.nu
> --
>
> On Nov 17, 9:34 am, Susi <mailtos...@gmail.com> wrote:
>
> > Hi
> >       Yeah It is for Custom tiles. I will explain the whole process.
> > I am creating tiles image using GD and I have lat/lon for each zip in
> > US.
> > I am creating imgaes for some zoom level and save these images in my
> > server. Also for a perticular
> > reason I have to update these images onces in a month. Problem is that
> > Its taking time for creating the images.
> > For some lower zoom level, I thought of applying Douglas - Peucker
> > algorithm to reduce the number of the points.
> > so that images can created much faster, I guess.
>
> > On Nov 17, 1:15 pm, Marcelo <marcelo...@hotmail.com> wrote:
>
> > > If you're using custom tiles, (as indicated in your other thread), you
> > > don't really need to reduce the number of points.
> > > If you're using encoded polylines instead, here is the page that
> > > Andrew was referring to:http://facstaff.unca.edu/mcmcclur/GoogleMaps/EncodePolyline/
>
> > > --
> > > Marcelo -http://maps.forum.nu
> > > --
>
> > > On Nov 17, 8:01 am, Susi <mailtos...@gmail.com> wrote:
>
> > > > Hi
>
> > > > How can I reduce number of points displayed on the Map in each Zoom
> > > > level, but same time want to retain the fedility of the shape.
> > > > I have gone through the Douglas - Peucker algorithm to reduce the
> > > > number of the polygons. But we need to provide the tolerance as
> > > > argument.
> > > > How can we calculate the tolerance for each zoom level? Are there any
> > > > equation to calculate the tolerance for each zoom level? Or Is it just
> > > > a constant value?

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