[Geoserver-users] .sld Can nodes be styled?

Tom_JDi_Solutions · July 23, 2007, 11:42am

Hi all,

Hopefully someone will just know the answer to this…

Is it possible to style a layer of polygons and lines to show only the nodes that make up the polygons and lines?

If I come up with the answer from the sld spec before I get a reply I’ll post it here…

cheers,

Tom

Tom_JDi_Solutions · July 23, 2007, 12:15pm

It looks like this is not possible since PointSymbolizer should render on the centre point of a geometry and LineSymbolizer appears to have no capability to show only the nodes. Looks like I’m going to have to try to extract the nodes into a seperate layer at the database level and then render that layer as a point dataset.

If anyone has a better solution please let me know, cheers.

On 7/23/07, Tom (JDi Solutions) <tom.dean@anonymised.com > wrote:

Hi all,

Hopefully someone will just know the answer to this…

Is it possible to style a layer of polygons and lines to show only the nodes that make up the polygons and lines?

If I come up with the answer from the sld spec before I get a reply I’ll post it here…

cheers,

Tom

Justin_Deoliveira · July 23, 2007, 3:24pm

Hi Tom,

Unfortunately I think this is probably the best solution. Are you using postgis? Perhaps pgRouting can work for you.

-Justin

Tom (JDi Solutions) wrote:

It looks like this is not possible since PointSymbolizer should render on the centre point of a geometry and LineSymbolizer appears to have no capability to show only the nodes. Looks like I'm going to have to try to extract the nodes into a seperate layer at the database level and then render that layer as a point dataset.

If anyone has a better solution please let me know, cheers.

On 7/23/07, *Tom (JDi Solutions)* <tom.dean@anonymised.com <mailto:tom.dean@anonymised.com>> wrote:

    Hi all,

    Hopefully someone will just know the answer to this...

    Is it possible to style a layer of polygons and lines to show only
    the nodes that make up the polygons and lines?

    If I come up with the answer from the sld spec before I get a reply
    I'll post it here...

    cheers,

    Tom

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Tom_JDi_Solutions · July 23, 2007, 3:40pm

No I’m using Oracle but thanks for confirming my fears. In case anyone’s interested the following query will extract all the points for insert into another table:


INSERT INTO point_table (geometry)

SELECT SDO_GEOMETRY(2001, 81989, SDO_POINT_TYPE
(X, Y, NULL), NULL, NULL
)
  FROM
  (
    SELECT t.X, t.Y
     
FROM orig_table tl,
     TABLE(SDO_UTIL.GETVERTICES(tl.geometry
)) t
     GROUP BY t.X, t.Y
  
);
 
commit;

Now I just have to wait for Oracle to spatially index 21m point geometries!

thanks,

Tom

On 7/23/07, Justin Deoliveira <jdeolive@anonymised.com> wrote:

Hi Tom,

Unfortunately I think this is probably the best solution. Are you using
postgis? Perhaps pgRouting can work for you.

-Justin

Tom (JDi Solutions) wrote:

It looks like this is not possible since PointSymbolizer should render
on the centre point of a geometry and LineSymbolizer appears to have no
capability to show only the nodes. Looks like I’m going to have to try
to extract the nodes into a seperate layer at the database level and
then render that layer as a point dataset.

If anyone has a better solution please let me know, cheers.

On 7/23/07, Tom (JDi Solutions) < tom.dean@anonymised.com
mailto:[tom.dean@anonymised.com](mailto:tom.dean@anonymised.com)> wrote:

Hi all,

Hopefully someone will just know the answer to this…

Is it possible to style a layer of polygons and lines to show only
the nodes that make up the polygons and lines?

If I come up with the answer from the sld spec before I get a reply
I’ll post it here…

cheers,

Tom

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Still grepping through log files to find problems? Stop.
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The Open Planning Project
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Andrea_Aime3 · July 23, 2007, 8:48pm

On Mon, July 23, 2007 5:40 pm, Tom (JDi Solutions) wrote:

No I'm using Oracle but thanks for confirming my fears.

Hum, I think we should set up a page listing known limitations
of SLD, and once we have a group of them maybe try to formally
address them to the SLD comitee in OGC.
So far I've seen this, the ability to render only the border
when applying a polygon symbolizer to a linestring (useful if
the layer turns out to have mixed geometry types), and the ability
to specify the external graphics URL using an expression instead
of a static string, to make it possible connecting to an
external symbol server (think complex graphics or charts).

Cheers
Andrea