Sorry Ákos, I do not know about WMS to answer these. Niels, are you able
to help? I think you might have had to address these issues.
Kind regards,
Ben.
On 06/03/13 22:04, Ákos Maróy wrote:
> Hi,
>
> After a really lot of preliminary work, I've started to implement a data
> store object that would work off AIXM documents - basically documents
> based on GML 3.2 and a set of other XML Schemas. My initial intention is
> to simply read such documents as files into memory, and then use these
> data stores to render content via SLDs. The basic code would look
> something like this:
>
> MapContent = new MapContent();
> AixmDataStore ds = new AixmDataStore("/some/aixm.file");
> Style style = ...
> FeatureLayer layer = new FeatureLayer(dataStore.getFeatureXXX(), style);
> map.addLayer(layer);
>
>
> and then render this map object.
>
> my knowledge is inadequate now on at least two points here. one is, for
> complex features, would one use DataStore.getFeatureSource(), which
> returns a SimpleFeatureSource, or would one use getFeatureReader()? but
> the latter cannot be supplied to a FeatureLayer() constructor call.
>
> moreover, DataStore.getFeatureSource() expects a 'typeName', which I
> can't really properly comprehend here, as all queries would be done
> later, which should simple go through all the data.
>
>
> my second area for lack of knowledge is about SLD filters in such cases.
> SLD filters seem to work well for 'flat' data, say checking if a column
> value in a database table matches a value, by using the
> <ogc:PropertyIsEqualTo/> element, etc. but in this case, the natural
> 'query language' would be XPath, where XPath statements pretty much
> contain themselves - there is no need to match against something.
>
> for example, if I want to get all elements of type<aixm:VOR>, then I
> can express it simply by the XPath statement "//aixm:VOR" - and this
> statement will simply result in the elements I'm looking for. or if I
> want to match a certain node value, I can say "//aixm:type[text() =
> 'VOR']" - here again, this is a unary predicate. but I don't see a way
> to express this in SLD, say for example:
>
> <sld:FeatureTypeStyle>
> <sld:Name>foo</sld:Name>
> <sld:Rule>
> <ogc:Filter>
> <ogc:UnaryPredicate>//aixm:VOR</ogc:UnaryPredicate>
> </ogc:Filter>
> ...
> </sld:Rule>
> </sld:FeatureTypeStyle>
>
>
>
> most probably I'm totally missing something obvious, of course :)
>
>
> Akos
>
>
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--
Ben Caradoc-Davies <[email protected]>
Software Engineer
CSIRO Earth Science and Resource Engineering
Australian Resources Research Centre
------------------------------------------------------------------------------
Symantec Endpoint Protection 12 positioned as A LEADER in The Forrester
Wave(TM): Endpoint Security, Q1 2013 and "remains a good choice" in the
endpoint security space. For insight on selecting the right partner to
tackle endpoint security challenges, access the full report.
http://p.sf.net/sfu/symantec-dev2dev
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