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AW: [udig-devel] Complex Features
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Hmm, that sounds good.
Can you give me some more details where to look? Is the
complex feature support in Geotools trunk, or on a working branch, or somewhere
else in the Geoserver repository?
> "data with
relationships just does not seem to be that common in the GIS
space"
Funny, at least for navigation data in GDF and similar raw
data formats, they have been all over the place from the very beginning.
OpenStreetMap also has relations.
And from a user point of view, the most obvious relations
in geodata are the incidence relations between nodes and links (e.g. junctions
and roads) or the containment hierarchy for administrative
regions.
So if the availability of test data is really a major
blocker, I think I could come up with a simple data model for complex features
(pun intended) and fill it with data compiled from OSM. (And I do not mean a
simple relational rehash of the OSM data model which provides almost no
semantics - I'm thinking of a schema modelling roads, junctions, road and place
names and admin hierarchies.)
Regards,
Harald
Support is gradually being rolled out.
One of the bottlenecks has been we lack a source of rich data structures
- data with relationships just does not seem to be that common in the GIS
space. As such even though we have the implementation in geotools we have been
able to do no more then write test cases against it.
Ben is the fellow leading the charge - I see he has a few words
here:
Aside - "complex features" makes sense in contrast to "simple features"
however it has proven very hard for me to get anyone to fund (something to
keep in mind next time you name something!)
As such there are two attempts to rename it:
- "rich features" - see that sounds like something worth funding :-)
unless people figure it already has money .... I hate language
- "community schemas" - this is actually an application of a rich feature
model; but it is something everyone can feel good about funding - after it
supports a community; and literally allows them to agree on a schema to share
information
Ben has been kind enough to create a test dataset in geotools so I can
try out the rich feature model in uDig. This was the major road block in
taking the rich feature model to uDig.
I share your passion for attributes and references; but we need people to
publish data sets that are interesting enough :-) If we want to wrap up Ben's
test dataset for the uDig catalog we can start working on the info tool
now.
Longer term I would like to see an H2 datastore with support for external
keys.
Jody
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