[Mapserver-users] SHP file simplification

Frédérique Boyer Frédérique Boyer
Fri, 4 Oct 2002 11:46:34 +0200 

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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 (>=3D 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
Fr=E9d=E9rique



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<DIV><FONT face=3DArial size=3D2><FONT face=3D"Times New Roman" =
size=3D3>Hi=20
all,<BR><BR>I'm using mapserver on a linux debian.<BR>I have all the =
maps of=20
France (buy from IGN) and these maps are very precise<BR>and =
acurate.<BR>All=20
works fine when I display a map with a distance of 1 to 50 =
kilometers.<BR><BR>My=20
problem is when I have to display 100 or more kilometers.<BR>The vectors =
of=20
roads are very numerous (&gt;=3D 200.000) and the server takes<BR>more =
than 3=20
minutes to make my map.<BR><BR>I think, the reason is that the server =
reads all=20
the vectors to transform<BR>them in a polyline before display.<BR>It =
coul'd be=20
accelarated with a very little number of vectors.<BR>At this level, I =
don't use=20
such a precision.<BR><BR>So, i have two solutions :<BR>Buy some maps =
with less=20
precision&nbsp; not very cheap :-(&nbsp; )<BR>Find a tool able to =
simplify a=20
shape file.<BR><BR>Someone knows if such a tool exist and where i can =
find it=20
??<BR><BR>Note : I don't have arcview.<BR><BR>Thank's a=20
lot<BR>Fr=E9d=E9rique</FONT><BR><BR></FONT></DIV></BODY></HTML>

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