+0. (Same reason as before.) I do have a couple of questions: My recollection is that the NetCDF CF (previously COARDS) Conventions were limited to one-grid-per file. Are your multiple coverages all on the same grid?
Do you support CF Conventions? Kind regards, Ben. On 09/05/13 00:00, 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 > fax: +39 0584 1660272 > mob: +39 339 8844549 > > http://www.geo-solutions.it > http://twitter.com/geosolutions_it > > ------------------------------------------------------- > > > ------------------------------------------------------------------------------ > 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 > > > > _______________________________________________ > GeoTools-Devel mailing list > GeoTools-Devel@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/geotools-devel > -- Ben Caradoc-Davies <ben.caradoc-dav...@csiro.au> Software Engineer CSIRO Earth Science and Resource Engineering Australian Resources Research Centre ------------------------------------------------------------------------------ Try New Relic Now & We'll Send You this Cool Shirt New Relic is the only SaaS-based application performance monitoring service that delivers powerful full stack analytics. Optimize and monitor your browser, app, & servers with just a few lines of code. Try New Relic and get this awesome Nerd Life shirt! http://p.sf.net/sfu/newrelic_d2d_may _______________________________________________ GeoTools-Devel mailing list GeoTools-Devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/geotools-devel
