Ciao Christian, please, read below... Regards, Simone Giannecchini ------------------------------------------------------- Ing. Simone Giannecchini GeoSolutions S.A.S. Founder
Via Poggio alle Viti 1187 55054 Massarosa (LU) Italy phone: +39 0584 962313 fax: +39 0584 962313 mob: +39 333 8128928 http://www.geo-solutions.it http://geo-solutions.blogspot.com/ http://www.youtube.com/user/GeoSolutionsIT http://www.linkedin.com/in/simonegiannecchini http://twitter.com/simogeo ------------------------------------------------------- On Mon, May 30, 2011 at 8:05 AM, <christian.muel...@nvoe.at> wrote: > Short result of my weekend investigations. > > Successful integration stopped at the CatalogBuilder, GranuleDescripter,.... > This architecture seems not well fitted for jdbc databases since it > will cause a lot of unnecessary IO. > > First, I have to load the the set of granule descriptors and > afterwards, fetch BLOB data for each granule. > > Number of Select statements = number of granules + 1. > Going by memory, what the GranuleCatalog does is to load a set of GranuleDescriptors (wrapping simple features). Therefore it is posible to iterate over features, and then use them to compose a mosaic; we do not really issue multiple select. Even if the data is inside a BLOB it should still be possible to mark that somehow (empty location??) and read the image from the blog itself. I believe we need to somehow push all the logic to choose overview level and subsampling within the GranuleCatalog and have your code implement that interface/class. > The current imagemosaic JDBC module does the following: > > Input for raster data fetching > > 1) level > 2) bbox > > Statement: > > select location,minx,miny,maxx,maxy,rasterdata from levelTable where > bbox intersects geom. > > Result > A set of georeferenced images. This set is the basis for mosaicking, > cropping and scaling. > > We have exactly one statement. This is also possible using jdbc-ng > SimpleFeatureTypes since BLOBs are supported. > > As a consequence, the module must be able to work with a set of > features,each feature containing minx,miny,maxx,maxy and rasterdata. > Unfortunately, I have not found a simple solution. > I will ask andrea and daniele to investigate as well and see what they come up with. > We should not forget our special friend Oracle Georaster. > Mosaicking,cropping and scaling is done in the database itself. > Well, this would require a custom MosaicBuilder that does it all at the DB level. Let's keep on brainstorming on this. Aside, can you point us towards the (extensive :) ) doc for your module so that we are all on the same line. > Any ideas ? > > > > > > > > > > > > > > > > ---------------------------------------------------------------- > This message was sent using IMP, the Internet Messaging Program. > > > > ------------------------------------------------------------------------------ > vRanger cuts backup time in half-while increasing security. > With the market-leading solution for virtual backup and recovery, > you get blazing-fast, flexible, and affordable data protection. > Download your free trial now. > http://p.sf.net/sfu/quest-d2dcopy1 > _______________________________________________ > Geotools-devel mailing list > Geotools-devel@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/geotools-devel > ------------------------------------------------------------------------------ Simplify data backup and recovery for your virtual environment with vRanger. Installation's a snap, and flexible recovery options mean your data is safe, secure and there when you need it. Data protection magic? Nope - It's vRanger. Get your free trial download today. http://p.sf.net/sfu/quest-sfdev2dev _______________________________________________ Geotools-devel mailing list Geotools-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/geotools-devel
