[OpenLayers-Users] Show huge vector layers

[Roald de Wit]

Hi René,

About a year ago, I tackled a similar problem [1]  by putting 
FeatureServer [2] in front of my WFS server, acting as a WPS (sort of). 
Nowadays there are a few applications that can do real WPS (OGC 
standard), like PyWPS, Zoo, deegree (IIRC). The nice thing with FS was 
that I only needed to proved the resolution as an extra WFS parameter to 
get it to work in OL.

The idea is simple:
- convert your GPX data into something that GeoServer (or MapServer, 
etc) can consume and then output as WFS
- have a WPS act as a proxy between OL and your WFS and
- configure the WPS to simplify the features it returns, based on your 
map resolution. The more you zoom in, the less you have it simplify and 
vice versa.

I hope that helps.

Regards,

Roald

[1] http://openlayers.org/pipermail/users/2009-January/009924.html
[2] http://featureserver.org/

On 03/05/10 19:20, Zoeppi at gmx.de wrote:
> Hello,
>
> I use OpenLayers to show the track of a user. The user uploads a gpx file and OpenLayers creates a vector and than shows the track. That's all working fine. But users can also upload track files with more than 10000 track points and that will slow down the zooming and scrolling of the map.
>
>
> I thought about using only every n-th track point, but if I zoom in, the resolution of the track becomes more and more bad, so I had to recalculate the track points for every zoom level, which also slows down the browser.
> So is there a way to limit the number of shown track points of a vector?
>
> Or is there a better way to solve my issue?
>
> Thanks for your help and best regards.
> René
>