One problem you're encountering is that cross-layer filters work as request
filters, not as SLD filters (as shown in the documentation).
Another problem you may encounter is that cross-layer filters are executed
internally in GeoServer, so there may be performance issues with large
datasets used as filters. Have you considered simply filtering by area
size of feature geometry instead?
On Wed, Oct 17, 2012 at 8:36 PM, cmaul christian.m...@dse.vic.gov.auwrote:
Common problem: The size of polygons of the cadastre. While they can be
displayed in rural areas at a scale of 25,000, the map in the city shows a
solid black. It wouldn’t be a specific Australian problem, I guess Italy
would be even more extreme with the agrarian factories of the
Emilia-Romagna, fields of hundreds of hectares and then a medieval town in
the middle with properties of 200 square metres, if they are even that big.
O.k you need to filter. I have a generalized map layer called BUILT_UP_AREA
in a different schema (421 features) which I want to use.
Install querylayers seems to be o.k.
WFS-getCapabilities (local 2.2):
…
ogc:FunctionName nArgs=1CollectGeometries/ogc:FunctionName
ogc:FunctionName nArgs=1queryCollection/ogc:FunctionName
Rather interesting the test geoserver (2.1.3) shows:
ogc:FunctionName nArgs=-1queryCollection/ogc:FunctionName
1 param and any, however, so far so good - both are there.
May be I am wrong here, but in my interpretation SLD uses filters identical
to WFS. My filter reads as follows:
ogc:Filter
ogc:Not
ogc:Within
ogc:PropertyNameSHAPE/ogc:PropertyName
ogc:Function name=collectGeometries
ogc:Function name=queryCollection
ogc:Literalsii:VMLITE.VMLITE_BUILT_UP_AREA/ogc:Literal
ogc:LiteralSHAPE/ogc:Literal
/ogc:Function
/ogc:Function
/ogc:Within
/ogc:Not
/ogc:Filter
First problem in both geoservers:
SystemID: U:\work\sld2\VICMAP_property_6_cl_filt.sld
line 30: cvc-complex-type.2.4.a: Invalid content was found starting with
element 'ogc:Function'. One of '{http://www.opengis.net/gml:_Geometry,
http://www.opengis.net/gml:Box}' is expected.
Well I don’t want a box, MultiLineString or whatever, I want a collection
of
polygons. O.k. I hit ‘submit’ and hope for the best against better
knowledge.
The following is the header of the sld:
StyledLayerDescriptor xmlns:xsi=
http://www.w3.org/2001/XMLSchema-instance;
xmlns=http://www.opengis.net/sld;
xmlns:ogc=http://www.opengis.net/ogc;
xmlns:sld=http://www.opengis.net/sld;
version=1.0.0
sld:NamedLayer
sld:NameProperty Map polygons/sld:Name
sld:UserStyle
which means in my opinion the sld should know what the tag ogc:Function
means.
So when I use the style the not so surprising result is that the filter is
ignored and the layer is shown. No error, no message, nothing from
Geoserver
2.2. If I take the second parameter out (after all WFS in geoserver2.2
shows a 1 as args number) and pass in only the layer as a parameter, I get
the same result.
How do I change that?
Geoserver 2.1.3 on the other hand gives me a NullPointer Error:
java.lang.NullPointerException
at
org.geotools.styling.FeatureTypeStyleImpl.setFeatureTypeName(FeatureTypeStyleImpl.java:179)
at
org.geotools.styling.SLDParser.parseFeatureTypeStyle(SLDParser.java:782)
at org.geotools.styling.SLDParser.parseStyle(SLDParser.java:742)
at
org.geotools.styling.SLDParser.parseNamedLayer(SLDParser.java:606)
at
org.geotools.styling.SLDParser.parseDescriptor(SLDParser.java:413)
at org.geotools.styling.SLDParser.parseSLD(SLDParser.java:375)
at org.geoserver.catalog.Styles$Handler$1.parse(Styles.java:277)
at org.geoserver.catalog.Styles.parse(Styles.java:91)
and that I would like to change as well.
-
Dr Christian Maul
Project Manager
Information Services Branch
Department of Sustainability and Environment
Level13, Marland House, 570 Bourke Street
Melbourne 3000
PO Box 500, East Melbourne Vic 3002
Telephone:+61-3-8636 2325
Telefax: +61-3-8636 2813
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