[Mapserver-users] SLD questions - How to filter

[Kralidis,Tom [Burlington]]

A couple of ideas:

1./

- have a 'service' i.e. some CGI script which dynamically generates an SLD
document based on your query, i.e.:

	  http://remote_server/cgi-bin/mapserv_41.exe?map=PATH/wms.map
        &WMTVER=1.0.0
        &REQUEST=map
        &TRANSPARENT=TRUE
        &SRS=EPSG:4326
        &BBOX=50,0,170,40
        &WIDTH=300
        &HEIGHT=150
        &FORMAT=PNG
        &layers=boundaries
 
&sld=http%3A//remote_server/cgi-bin/makesld.exe%3FselectedCountry%3DChina

- use the SLD_BODY keyword to pass the entire SLD document (you might want
to use HTTP POST here :))

2./
- setup another mapfile with the SLD as per below as the template, and pass
that output as the SLD to the WMS

Hope this helps.

..Tom

=========================
Tom Kralidis
Systems Scientist
Environment Canada
Tel: +01-905-336-4409
http://www.ec.gc.ca/cise/


-----Original Message-----
From: Stefan Schwarzer [mailto:stefan.schwarzer at grid.unep.ch] 
Sent: Thursday, February 26, 2004 2:42 AM
To: mapserver-users at lists.gis.umn.edu
Subject: [Mapserver-users] SLD questions - How to filter


Dear list, dear Assefa,

I am trying to understand the functioning of the Styled Layer Descriptor and
am testing the 4.1 development version.

My "problem" (i.e. challenge) is the following: I would like to indicate a
country name within a WMS query, e.g. something like:

        http://remote_server/cgi-bin/mapserv_41.exe?map=PATH/wms.map
        &WMTVER=1.0.0
        &REQUEST=map
        &TRANSPARENT=TRUE
        &SRS=EPSG:4326
        &BBOX=50,0,170,40
        &WIDTH=300
        &HEIGHT=150
        &FORMAT=PNG
        &layers=boundaries

        &selectedCountry=China

in order to receive something like the attached map (highlighting the
selected country).

As far as I understand I have to setup a SLD file... (I am not at all sure
about the correct use of the parameters!)
        <?xml version="1.0" encoding="UTF-8"?>
        <StyledLayerDescriptor version="1.0.0">
                <NamedLayer> 
                        <Name>boundaries</Name>
                        <UserStyle> 
                                <Filter>
                                        <PropertyIsEqualTo>
 
<PropertyName>[CNTRY_NAME]</PropertyName>
                                        <Literal>Thailand</Literal>
                                        </PropertyIsEqualTo>
                                </Filter>
                        </UserStyle>
                </NamedLayer>
        </StyledLayerDescriptor>

and attach it to the URL...
        &SLD=PATH/sld.xml

My .map file (resp. the layer) is looking like this:
        LAYER
                NAME boundaries
                TYPE POLYGON
                STATUS ON
                DATA boundaries 
                CLASSITEM CNTRY_NAME
                LABELITEM CNTRY_NAME
                CLASS   
                        #EXPRESSION ('[CNTRY_NAME]' eq 'China')
                        NAME 'boundaries'
                        #OUTLINECOLOR 0 0 0
                        TEMPLATE 'dummy'
                        LABEL
                                FONT arial-bold
                                TYPE truetype
                                ANTIALIAS true
                                SIZE 12
                                COLOR 248 255 43
                                OUTLINECOLOR 0 0 0
                        END
                END
        END

But in the moment it doesn't work. Can anybody give me some hints or
indicate the location of some examples?

Thanks a lot,

Stefan






        _______________________________________

        Stefan Schwarzer
        Consultant on GEO

        UNEP/DEWA/GRID-Geneva
        Chemin des Anemones 11
        CH - 1219 Chatelaine
        Switzerland

        Tel: (+41) 22.917.83.49
        Fax: (+41) 22.917.80.29

        Email: stefan.schwarzer at grid.unep.ch
        Internet: http://geodata.grid.unep.ch/
        _______________________________________