Intersect filter not working with WMS GetMap

[tbonfort]

Reporter: b.veldkamp@zonnet.nl Date: 2004/09/30 - 10:58

We are unable to get the Intersect filter working with a WMS GetMap request.
Ordinary requests such as
http://localhost/cgi-bin/mapserv.exe?map=test.map&service=wms&version=1.1.0&request=getmap&layers=nap&styles=
work without any problem, but using an sld with an embedded intersect filter
(i.e.
http://localhost/cgi-bin/mapserv.exe?map=test.map&service=wms&version=1.1.0&request=getmap&layers=nap&styles=&sld=http://localhost/intersect.sld)
results in an empty image.

Other filters in an sld, such as PropertyIsLike, PropertyIsEqualTo of
PropertyIsBetween work correctly. 
I tried a recent nightly build (sep 20), where a bug concerning spatial filters
was fixed, but still no luck. Maybe a simple example of how to apply a spatial
filter would clarify things?

Berend Veldkamp

Here's an example sld-file:
<StyledLayerDescriptor version='1 0 0'>
  <NamedLayer>
    <Name>nap</Name>
    <UserStyle>
      <Title>nap</Title>
      <FeatureTypeStyle>
        <Rule>
          <Filter>
            <Intersect>
              <PropertyName>geometry</PropertyName>
              <Polygon srsName="EPSG:28992">
                <outerBoundaryIs>
                  <LinearRing>
                    <coordinates>258964.100000,557394.600000
259215.900000,557073.900100 259842.100000,556199.199900
261295.200000,554253.600000 258964.100000,557394.600000</coordinates>
                  </LinearRing>
                </outerBoundaryIs>
              </Polygon>
            </Intersect>
          </Filter>

          <PointSymbolizer>
            <Graphic>
              <Size>5</Size>
              <Mark>
                <WellKnownName>circle</WellKnownName>
                <Fill>
                  <CssParameter name="fill">#0000ff</CssParameter>
                </Fill>
              </Mark>
            </Graphic>
          </PointSymbolizer>
        </Rule>
      </FeatureTypeStyle>
    </UserStyle>
  </NamedLayer>
</StyledLayerDescriptor>

[tbonfort]

Author: dmorissette Date: 2004/09/30 - 16:31

Since spatial filters don't map well into MapServer classes, it is quite likely
that spatial filters are just not supported for SLD. I'll let Assefa comment
further on that.

[tbonfort]

Author: dmorissette Date: 2004/09/30 - 16:44

Quick clarification, in my previous comment, of course I meant: "spatial filters
not supported for SLD *in MapServer*".

[tbonfort]

Author: assefa Date: 2004/09/30 - 17:05

I had actually added the support for the spatial filters for WMS couple of
months ago. The main addtion was for BBOX filters but I also added Intersect and
Dwithin. I did some tests a couple of weeks ago and did some corrections related
to these filters (sep 17) and my test case was passing.

 I can check what is wrong with filter if you provide me with sample data that
goes with the filter. It takes me a  considerable amount of time to reproduce
any problems without sample data. You can e-mail me your data personnaly if
possible. 

[tbonfort]

Author: dmorissette Date: 2004/09/30 - 17:14

Assefa, did you really do filters *in SLD*?

[tbonfort]

Author: assefa Date: 2004/09/30 - 17:54

Yes in was added in SLD. I have created a bug 919 to update the SLD docs and add
sld with spatial filters examples using the world_test data.

[tbonfort]

Author: b.veldkamp@zonnet.nl Date: 2004/10/01 - 10:40

Never mind, after two weeks of pulling my hairs out, it now all of a sudden
works :-| I have no idea what I changed to make it work, but if I find out, I'll
let you know.

BTW does Mapserver as WMS *client* also support sld filters? I believe that what
Mapserver does now, is try to convert a filter to classes *) and then, when
making a WMS request, it converts these classes back to an sld filter. Or is it? 
Obviously this can't work for spatial filter, due to the nature of Mapserver
classes, but I think that if a valid filter is already known, there's no need to
create classes in the first place, right?

Berend

*) I'm talking about php/mapscript and applysld() here.

[tbonfort]

Author: assefa Date: 2004/10/29 - 01:57

Marking this as Invalid. Please reopen if there are still issues.

Regarding the question in comment #6, If I understant well, You can specifify 
on a wms client layer (in the map file) the following metadata :

wms_sld_url : value would be an url to a valid sld document. The WMS request 
will be send using SLD=

wms_sld_body : 2 possible values
   - full sld document (eg ("wms_sld_body" "StyledLayerDescriptor version='1 0 
0'>...</StyledLayerDescriptor>"
   - or the value can be AUTO ("wms_sld_body" "AUTO") : this will genarate an 
SLD from your classes
 When using the wms_sld_body, the WMS request will be send using SLD_BODY

[tbonfort]

Author: b.veldkamp@zonnet.nl Date: 2004/10/29 - 08:29

Ah, OK. I had only tried wms_filter in the metadata. Is wms_sld_url documented
somewhere?

[tbonfort]

Author: assefa Date: 2004/10/29 - 15:40

The docs are in mapserver wiki right now :
http://mapserver.gis.umn.edu/cgi-bin/wiki.pl?SLDMapServer

It should make it to the official docs location before the 4.4. release.