Ciao Stephen, the ImageMosaic is not the proper choice when for low resolutions it will have to open hundreds of files. So if you have more than 20/30 files that composes your mosaic then performance goes from bad to unacceptable. There is one thing to notice, imagemosaic can be used effectively in conjunction with formats like ecw or mrsif (or jp2) where the size of each file can be very big and hence you can create mosaic that are very large and still have good performance.
The other approach is tu build up a pyramid. This time we create various mosaics at various resolutions levels. When the resolutions decreases the number of files decreases as well since usually the file size is fixed. The drawback I foresee most part of the time with this approach is that it is very good when it is really need but most part of the time, when data is under 10/20 gigs there is no need to go under the task of creating the pyramid. Long story short, you might be in the case where a pyramid is needed, since the size of the data is quite big. 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, Apr 18, 2011 at 5:39 PM, Stephen V. Mather < [email protected]> wrote: > It looks like, based on my reading, the image mosaic, unlike the pyramid > layer is not as good at serving large overviews, as everything is > partitioned into many tiles, but it is very good for serving the detailed > data itself and large volumes of it. Is this a correct assessment? > > > > Steve > > > > > > [image: http://www.clemetparks.com/images/esig/cmp-ms-90x122.png]Stephen > Mather > Geographic Information Systems (GIS) Manager > (216) 635-3243 > > [email protected] > clevelandmetroparks.com <http://www.clemetparks.com/> > > > > > > > > > > *From:* Stephen V. Mather [mailto:[email protected]] > *Sent:* Monday, April 18, 2011 11:06 AM > *To:* [email protected] > > *Subject:* Re: [Geoserver-users] ImagePyramid extension vs. ImageMosaic > > > > Looks like I originally just sent this back to Simone: > > > > Hi Simone, > > For better or for worse, our users tend to expect to use > the data at all scales, although there is probably more I could do to > discourage this. As far as volume, we’re talking about the 150GB-800GB > range, depending on the dataset. > > > > Steve > > * * > > > > [image: http://www.clemetparks.com/images/esig/cmp-ms-90x122.png]Stephen > Mather > Geographic Information Systems (GIS) Manager > (216) 635-3243 > > [email protected] > clevelandmetroparks.com <http://www.clemetparks.com/> > > > > > > > > > > *From:* [email protected] [mailto:[email protected]] *On Behalf Of *Simone > Giannecchini > *Sent:* Thursday, April 14, 2011 5:06 PM > *To:* [email protected] > *Cc:* [email protected] > *Subject:* Re: [Geoserver-users] ImagePyramid extension vs. ImageMosaic > > > > Ciao Stephen, > I will tell you what is my take on this. > > First discriminant, you want to to show the data at all scales or just at > the small scales ? > Second discriminant, how much data are we talking about? Order of terabytes > or order of (tenth of) gigabytes? > > Generally speaking I tend to avoid using a pyramid (files base or db based) > and thend to prefere a mosaic; anyway it would be great a bit more about > your use case. > > > 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 Thu, Apr 14, 2011 at 5:18 PM, Stephen V. Mather < > [email protected]> wrote: > > Hi All, > > Looking at the options for serving large amounts of > imagery, what are the performance and practical differences between > ImagePyramid and ImageMosaic? Is there any known ceiling to 1) number of > images 2) total size and extent of images for either method? > > > > Thanks, > > Steve > > > > > > [image: http://www.clemetparks.com/images/esig/cmp-ms-90x122.png]Stephen > Mather > Geographic Information Systems (GIS) Manager > (216) 635-3243 > > [email protected] > clevelandmetroparks.com <http://www.clemetparks.com/> > > > > > > > > > > > > ------------------------------------------------------------------------------ > Benefiting from Server Virtualization: Beyond Initial Workload > Consolidation -- Increasing the use of server virtualization is a top > priority.Virtualization can reduce costs, simplify management, and improve > application availability and disaster protection. Learn more about boosting > the value of server virtualization. http://p.sf.net/sfu/vmware-sfdev2dev > _______________________________________________ > Geoserver-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/geoserver-users > > > > > ------------------------------------------------------------------------------ > Benefiting from Server Virtualization: Beyond Initial Workload > Consolidation -- Increasing the use of server virtualization is a top > priority.Virtualization can reduce costs, simplify management, and improve > application availability and disaster protection. Learn more about boosting > the value of server virtualization. http://p.sf.net/sfu/vmware-sfdev2dev > _______________________________________________ > Geoserver-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/geoserver-users > >
<<image002.png>>
------------------------------------------------------------------------------ WhatsUp Gold - Download Free Network Management Software The most intuitive, comprehensive, and cost-effective network management toolset available today. Delivers lowest initial acquisition cost and overall TCO of any competing solution. http://p.sf.net/sfu/whatsupgold-sd
_______________________________________________ Geoserver-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/geoserver-users
![http://www.clemetparks.com/images/esig/cmp-ms-90x122.png]Stephen](http://www.clemetparks.com/images/esig/cmp-ms-90x122.png]Stephen){kind=link}