Read over the proposal. Looks nice, this will be great to have.
One question that came up while reading through the proposal was
GranuleSource/Store looks a whole lot like FeatureSource/FeatureStore. Was
it considered to simply model granules as Feature objects, and use the
existing interfaces. Apologies if this was already discussed and I missed
it.
On Wed, May 8, 2013 at 10:00 AM, Andrea Aime
<andrea.a...@geo-solutions.it>wrote:
> Hi,
> a second proposal we'd like to push forward is the ability to look under
> the hood of a grid reader that does mosaicking of information (either
> spatial, temporal or along other dimensions) and get to know the pieces
> making it up:
> http://docs.codehaus.org/display/GEOTOOLS/Structured+grid+coverage+readers
>
> The first obvious candidate for this is image mosaic.
> ImageMosaicJDBC could be another one, if there is interest in extending it.
>
> A side benefit of this proposal is that it would allow applications to be
> more flexible in terms of what dimensions they offer, instead of having to
> accept a time dimension that the reader is proposing, they could inspect
> the date attributes in the granules schema and pick one of their choosing
> (and then send down a Filter when doing the readCoverage request to select
> the bits they want), and also, it would allow us to work against large
> domains more efficiently, since we would not need to convert them to
> strings and back anymore (a limitation that comes with the reader metadata
> map being string oriented).
>
> Also, with this proposal, along with the previous one, we'd be able to
> commit also the NetCDF reader as a community module.
> The NetCDF reader we have been developing supports multiple coverages per
> NetCDF file (e.g., Polyphemus files have 3 coverages inside), supports
> multiple dimensions, and has multi-level indexing to allow fast access to a
> certain coverage/time/elevation combiantion (we basically move directly to
> the offset in the netcdf file containing the information we want).
>
> The NetCDF reader is also the first example of the Grid coverage api to
> come, one that mimics 1-1 the datastores api: it's basically built on it,
> and then adapted to the existing GridCoverageReader one.
>
> The reason for this is that we don't know exactly when we'll be able to
> push the new api so that all readers can adopt it, that is significant work
> that we are not likely to accomplish in the next 6 months, so these two
> proposals are stepping stones towards it (regardless, even when we do the
> switch we'll need wrappers towards the old api to allow a transition period
> and an API deprecation cycle).
> But at least, it would mean the new coverage api gets from spike, where it
> has been sitting for a few years now, to unsupported land.
> If you haven't followed the discussion a few years ago, the coverage-api
> that we're talking about is here:
>
> https://github.com/geosolutions-it/geotools/tree/multidim/modules/unsupported/coverage-experiment/coverage-api
> and the NetCDF provider is here:
>
> https://github.com/geosolutions-it/geotools/tree/multidim/modules/unsupported/coverage-experiment/netcdf
>
> Cheers
> Andrea
>
> --
> ==
> GeoServer training in Milan, 6th & 7th June 2013! Visit
> http://geoserver.geo-solutions.it for more information.
> ==
>
> Ing. Andrea Aime
> @geowolf
> Technical Lead
>
> GeoSolutions S.A.S.
> Via Poggio alle Viti 1187
> 55054 Massarosa (LU)
> Italy
> phone: +39 0584 962313
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>
> http://www.geo-solutions.it
> http://twitter.com/geosolutions_it
>
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--
Justin Deoliveira
OpenGeo - http://opengeo.org
Enterprise support for open source geospatial.
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Learn Graph Databases - Download FREE O'Reilly Book
"Graph Databases" is the definitive new guide to graph databases and
their applications. This 200-page book is written by three acclaimed
leaders in the field. The early access version is available now.
Download your free book today! http://p.sf.net/sfu/neotech_d2d_may
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