Same deal for this proposal, please write my name down for a couple of
documentation tasks.
1. reading a netcdf file (assume there will be a test case for me to use as an
example?)
2. file harvest for image mosaic
--
Jody Garnett
On Wednesday, 8 May 2013 at 10:00 AM, Andrea Aime 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 (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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> mob: +39 339 8844549
>
> http://www.geo-solutions.it
> http://twitter.com/geosolutions_it
>
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