[OSGeo-Discuss] I just saw this link go by my email ....
rkgeorge at cadmaps.com
Tue Aug 1 12:15:23 PDT 2006
Thanks for the link. I am glad to see that GOS NSDI etc are fairly
far along in the discovery services angle.
Also interesting, for anyone looking into the potential of catalogue
After skimming the OGC CSW 2.0.1 and trying a few experiments on CSW call
chains looking for WMS services at
apabilities, I didn't find an easy way to search for WMS/WFS/WCS services
(using GetRecords), but I am a newbie on CSW. I did find some more
interesting SOAP services!
is working out an approach to the discovery issue from osgeo perspective.
Discovery service is a need and a lot more complex than I had thought at
first glance. Just a way to find getCapabilities links on available OWS
services is a good start. FGDC metadata is certainly complete and CSW is
flexible, but in the meantime lightweight metadata would work.
I like this note:
Per Chris Holmes': "Something much more lightweight, that other services can
On a separate note:
I have sometimes been frustrated by the imposition of a front end
client to services, hiding the middle tier OWS from direct access. Quite a
few services seem to have ESRI clients in the front and require some time
consuming investigation to get at the getCapabilities url.
"Open", I think, should entail open to other service chains and
client interfaces, and a good start would be some neutral url repository.
Detailed metadata like owner, bbox, attributes... are available from that
basic starting url, at least on OWS.
From: Doug Nebert [mailto:ddnebert at fgdc.gov]
Sent: Monday, July 31, 2006 11:40 AM
To: discuss at mail.osgeo.org
Subject: Re: [OSGeo-Discuss] I just saw this link go by my email ....
Randy George wrote:
> Hi Paul,
> Very helpful overview.
> I didn't know - "GeoServer includes support for the Z39.50 catalog server"
> There aren't very many OWS catalogue services around.
> Although, this is a useful alternative:
> http://www.refractions.net/white_papers/ogcsurvey/index.php :)
> Actually bare links to capabilities xml might be just as useful as a full
> blown OGC Catalogue.
> Seems like an OGC Catalogue service (or something like it) would be a
> service for OSGeo to host, since public OWSs hold a lot of promise for the
> data side of open source.
There are three protocols for OGC Catalogue Services: Z39.50 (400+
registered servers), HTTP CS-W web interface (at least 50 instances),
and CORBA (perhaps 10).
> I would think NSDI(http://www.fgdc.gov/grants )would want to implement at
> least a catalogue service for USA agencies (part of One Stop). OSGeo is a
> 'bit' more internationally oriented and could better perform the role of
> international OWS cataloguing. A combination of search and community
> populated OGC services would really help. Right now it's difficult to find
> url's to services, many are still experimental, some are not publicized
> to resource limitations.
The geodata.gov service does expose both a CS-W and Z39.50 interface to
search all its resources (services and data) with the response returned
as XML ("Full" form as FGDC XML).
Z39.50 entrypoint: z3950s://gos2.geodata.gov:210 (databasename=default)
> Hmm, I just ran across this:
> Looks like work in progress. Has anyone looked into a 2007 grant proposal
Douglas D. Nebert
Geospatial Data Clearinghouse Coordinator, Information Architect
FGDC/GSDI Secretariat Phone: +1 703 648 4151 Fax: +1 703 648-5755
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