Hi,
The biggest lake has more than 5000 islands and lots of bays and everything so
I was thinking that a simple automatic tool would for sure break the topology,
and sooner than I could have explained how a good tool should behave I had
splitted the ten biggest lakes by hand. I can't even imagine how hard it would
to be to code such a tool. It should not make invalid geometries and it should
create new vertices so that new polygons could zigzag between the islands
without splitting those, and the new pieces should have about same total number
of vertices with variable number of islands. It was rather easy to iterate with
bare eyes.
-Jukka-
________________________________
Lähettäjä: [email protected] [mailto:[email protected]]
Puolesta Sebastian E. Ovide
Lähetetty: 27. lokakuuta 2010 16:21
Vastaanottaja: Rahkonen Jukka
Kopio: [email protected]
Aihe: Re: [mapserver-users] Maximum number of points in a poligon
Do you spliited the polygons manually or you have some script ? perhaps
using gdal ?
On Wed, Oct 27, 2010 at 1:36 PM, Rahkonen Jukka
<[email protected]> wrote:
Hi,
All I can say is that with our data the service went all to
slow for the end users long before jamming. We have been splitting the biggest
lake polygons into pieces with no more than 45000 vertises because that was the
limit of reasonable speed in our environment. But in that case the limiting
factor was the database and "contains" queries, not Mapserver. Anyhow,
splitting the lakes was good for Mapserver too. For some other layers we have
made simplified versions for the far-away zooms. Simplifying is better for WMS
use if polygons are drawn with different outline colour but it gives a bit more
work with building the scale dependent layers.
-Jukka Rahkonen-
________________________________
Lähettäjä: [email protected]
[mailto:[email protected]] Puolesta Sebastian E. Ovide
Lähetetty: 27. lokakuuta 2010 14:57
Vastaanottaja: [email protected]
Aihe: [mapserver-users] Maximum number of points in a
poligon
Hi All,
I have a shape with 2M polygons. The biggest one has
13k points. It works very well, and fast enough.
I have another shape with 300k polygons and the biggest
one has 800k points... This shape hangs MapServer !... and I have to kill the
process by hand using kill -9. (see the other thread: process survive after
killing apache). The shape files can be opened with ogrinfo though
Is there a maximum number of points for single polygon
supported by MapServer ?
Thanks
--
Sebastian E. Ovide
--
Sebastian E. Ovide
_______________________________________________
mapserver-users mailing list
[email protected]
http://lists.osgeo.org/mailman/listinfo/mapserver-users
