Hi Rob:
Okay so more like graph data structures; edge graphics; network analysis fun
and games and so forth. (Not GML's take on ISO 19107 Point, Curve, Surface
etc...).
You can look at the gt-graph package but it is more about isolating the
concepts so algorithms can be written; a persistence mechanism has not been
provided (GML or otherwise) - instead the graph is built from the feature
relationships as needed). Adding a GML import/export to this would be a very
welcome direction.
If you have any references (even just to the basics they would be a welcome
addition to the conversation).
Given that this is a devel list I went straight to the source:
- http://schemas.opengis.net/gml/3.1.1/base/topology.xsd
It actually looks pretty much as expected:
<complexType name="DirectedEdgePropertyType"> <sequence minOccurs="0"> <element
ref="gml:Edge"/> </sequence> <attribute name="orientation" type="gml:SignType"
default="+"/> <attributeGroup ref="gml:AssociationAttributeGroup"/>
</complexType>
And then gets into the fun/exotic (the gt-graph does support creating graphs
based on polygon relationships but it is fun to see it in GML):
<complexType name="TopoSurfacePropertyType"> <sequence> <element
ref="gml:TopoSurface"/> </sequence> </complexType>
Justin did have some ideas on how to persist this stuff; and there is at least
one opengeo project that covers fun with graphs; and pgRouting based things.
--
Jody Garnett
On Thursday, 28 July 2011 at 5:31 PM, [email protected] wrote:
> Hi,
>
> I’ve a new activity starting up that would like topology to be delivered
> through GML Topology. Given we use Geoserver WFS, Geotools will ultimately
> play an important role. We will eventually want query’s as well but suspect
> that will be a WPS issue.
>
> It is worth noting that in this case the Geometry data product is not the
> same as the Topology data product – we don’t need to know the rivers shape in
> order to calculate interesting things about inflows and outflows. The
> topology is thus not directly constructed from the geometry and is, and can
> be, delivered all by itself. A Feature with only Topology information is
> likely.
>
> I’d be interested in hearing experience from anyone who has taken a stab at
> or considered implementing GML topology delivery through Geotools and
> Geoserver WFS (or any other WFS server for that matter). Any pointers to any
> papers and trials would also be welcomed – I have trolled the OGS
> interoperability test beds and only found two references to this issue one in
> OWS3 and one in OWS4 (the latter being less relevant to my use-case).
>
> Cheers,
>
> Rob
>
> Dr Robert Woodcock
> CSIRO – Canberra, Australia
> Mobile: 0412 298 696
> Ph: 08 6436.8780 | E: [email protected]
> (mailto:[email protected]) | W: www.csiro.au (http://www.csiro.au/)
>
> Please note on Monday's and Tuesday's I will normally be found at Geoscience
> Australia as part of the CSIRO/GA e-Research Collaboration project.
>
>
>
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