[Mapserver-users] SHP file simplification

[woodbri at swoodbridge.com]

In most cases, the best tool for this is Mapserver! Depending on how 
your data is organized, you should be able to turn off the roads 
layer using MINSCALE and MAXSCALE parameters in the map file. Also if 
you have attributes with you roads, only display major roadways when 
you are zoomed out, by making another layer that is turned on when 
the regular roads are turned off that only displays the major roads 
by using the CLASSITEM to select the only the attributed major roads.

-Steve

On 4 Oct 2002 at 11:46, Frédérique Boyer wrote:

> 
> Hi all,
> 
> I'm using mapserver on a linux debian.
> I have all the maps of France (buy from IGN) and these maps are very
> precise and acurate. All works fine when I display a map with a
> distance of 1 to 50 kilometers.
> 
> My problem is when I have to display 100 or more kilometers.
> The vectors of roads are very numerous (>= 200.000) and the server
> takes more than 3 minutes to make my map.
> 
> I think, the reason is that the server reads all the vectors to 
> transform
> them in a polyline before display.
> It coul'd be accelarated with a very little number of vectors.
> At this level, I don't use such a precision.
> 
> So, i have two solutions :
> Buy some maps with less precision not very cheap :-( )
> Find a tool able to simplify a shape file.
> 
> Someone knows if such a tool exist and where i can find it ??
> 
> Note : I don't have arcview.
> 
> Thank's a lot
> Frédérique
> 
>