Dear Andrea,
Thank you for your input.
I am very interested in your solution and the extension.
Since the blog article is from 2011 I could not find the extension. Can you
send a short manual how to set up your solution.
I would like to test it.
Kind regards,
Alexander
From: [email protected] [mailto:[email protected]] On Behalf Of Andrea
Aime
Sent: Monday, December 1, 2014 10:29
To: Strunck, Alexander GIZ PS
Cc: [email protected]
Subject: Re: [Geoserver-users] Combining map services to one map serivce
On Sun, Nov 30, 2014 at 10:23 AM, Strunck, Alexander GIZ PS
<[email protected]<mailto:[email protected]>> wrote:
Dear all,
I am looking to find a solution to combine different map services into one
service.
Example: Every municipality collects building data on a local level. The
municipalities are working with different systems and every municipality runs a
service with their building data.
We would like to share the data on a national level and we want to combine all
these services into one service.
This is still on a concept level but we have to brainstorm on the fact, that
the municipalities do not trust each other and they are not willing to share
their data into one database.
Some time ago we built something similar for WFS, same situation:
http://www.geo-solutions.it/blog/geoserver-aggregating-datastore-aggregate-and-republish-from-several-data-sources/
In your case it's WMS, so it would require a different solution. I'd say the
buildilng blocks are almost there already,
the aggregating data store could be replaced by the mosaick one, and the wfs
one by the ability to cascade
by the WMS cascading support, we just have no way to mix them toghether,
someone would need to write
a property WMS coverage store (what we have now it's not fully implement, just
enough to allow GeoServer
to use it), and then some tooling to build a mosaick out of them.
I guess the reader would have to start off the caps link, but would also need a
list of layers to be cascaded, and
the format to be used for cascading
What are the limits of combining a lot of different services?
Given the experience with the WFS aggregating one, the important bits are:
* ability to make all the requests in parallel, to avoid waiting a lot,
especially over the slowest servers of the lot
(mosaick can do this already)
* ability to only cascade over the servers that are in the area requestest
(mosaick does this already)
* tolerate failures, when hitting many distributed servers having all of them
online and working at the same
time is more the exception than the rule (this would need to be developed,
right now the mosaicking request
fails if one of source readers fails)
Not sure if this is your case, but if reprojection is in the mix because not
all source servers are accepting
the output, requested CRS, small diferences in reprojection accuracy on the
source servers might also
be an issue
Hope this helps.
Cheers
Andrea
--
==
GeoServer Professional Services from the experts! Visit
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==
Ing. Andrea Aime
@geowolf
Technical Lead
GeoSolutions S.A.S.
Via Poggio alle Viti 1187
55054 Massarosa (LU)
Italy
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