Hi Edward,
I realize the typical use case for mbtiles, but my scenario is a little
different than most. What I am seeking is the most compact (disc size)
raster source possible, and based on the research of my colleague, mbtiles
what the industry uses to cache tile data on smart phones etc, so he
theorizes this is the most compact. I have him running tests to prove this
claim at the moment, which seems interesting to me as compressing image
binaries (aside from deduplication) isn't usually that significant. In the
mean time, I wanted to test the waters for community interest in this -
your response was very helpful in this regard.
My use case is that I would like make a version of my web application
(currently bundled as an EAR, dependent on GIS services) easily deployable
to nodes that are often offline or with very poor communications. These
nodes will have no IT support, so they really need a double-click/service
run sort of operation. Rather than write a thick client application, which
I will have to maintain with an already understaffed/small team, I am
looking to leverage an embedded application server (glassfish) to serve as
a container for my apps and geoserver (war) both backed by an H2 database
(for relational an vector/metadata). Geoserver would serve as an
offline/local GIS solution for each node, which I would initially seed with
some raster data but would receive updates through a remote management
service. What I am looking toward mbtiles for is a compact raster source.
A second (smaller) advantage is it's small disc footprint in terms of
number of (small/very small) files. Since many of these deployments will
be on file systems that need to be regularly defragmented, I don't want to
cause users to have to do this type of "administrative" work (especially
since they might not by delegated the permission to do so).
I did initially see that GeoWebCache supported this and provides WMTS
(which is great). I initially suggested we use GeoWebCaches ability to
register tiles programmatically via it's REST API to seed the cache and use
this service, but the team made a good point in that that wouldn't give WMS
services, which is important for many other clients (if we're giving them
an offline GIS server, they might as well be able to use it for all their
tools that support OGC services). Depending on the most of disc space
allocated to us, we may or may not have GeoWebCache running on the deployed
system - of course, if geoserver directly supported mbtiles, perhaps it
could be done in such a way that both system could use the same source
(read only, of course) - geoserver for WMS+ and geowebcache for WMS-C,
WMTS, TMS, etc.
I appreciate your time, and any feedback would you and the community would
be greatly appreciated.
S
On Tue, Jan 31, 2012 at 4:41 AM, Edward Mac Gillavry <
[email protected]> wrote:
> Steven,
>
> MBTiles is a storage format for tile caches. In what sense would you like
> to see GeoServer supporting MBTiles? Tile caches are typically generated
> with GeoWebCache in the context of GeoServer. Here, the MBUtil (
> https://github.com/mapbox/mbutil) could be of use to convert your
> directory based tile cache created by GWC into MBTiles and then serve it in
> TileMill? Also, MBUtil and a few other scripts (e.g.
> https://gist.github.com/837851 and
> https://github.com/pbarry/MBTiles-extractor) take the tiles from the
> MBTiles database and put them into a directory structure.
>
> Or would you like to see GeoServer treating an MBTiles database as it
> would cascade a WMS, i.e. yet another data store?
>
> Kind regards,
>
> Edward
>
> From: [email protected]
> Date: Mon, 30 Jan 2012 14:43:58 -0500
> To: [email protected]
> Subject: [Geoserver-users] mbtiles support
>
>
> Hello,
>
> I've checked the email archives, JIRA, and the project Roadmap and see no
> mention of supporting MBTiles in GeoServer. I did, however, see a few
> external blogs mentioning that it was on a "long list" of items to
> support.
>
> I did briefly go through the trunk branch and the branches branch on the
> SVN and didn't see any existing project for this.
>
> Is there any community effort on this particular issue at the moment that
> I'm not seeing? Is there interest by the community for something like this
> in GeoServer?
>
> If creating an extension for GeoServer is the route I go...I see that GDAL
> has support for mbtiles. Can anybody give advice on this would be the right
> approach for the GeoServer architecture, our supporting the mbtiles
> specification directly would be more preferable. Any other info/interest
> in this would be good to know, which would influence myself/my company in
> investing in this effort.
>
> Regards,
>
> Steve
>
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--
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Director Innovation and Research
T3 Solutions
(706) 791-9083
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