Ciao Jonathan, please find my answers inline below... Regards, Simone Giannecchini == Our support, Your Success! Visit http://opensdi.geo-solutions.it for more information. ==
Ing. Simone Giannecchini @simogeo Founder/Director GeoSolutions S.A.S. Via Poggio alle Viti 1187 55054 Massarosa (LU) Italy phone: +39 0584 962313 fax: +39 0584 1660272 mob: +39 333 8128928 http://www.geo-solutions.it http://twitter.com/geosolutions_it ------------------------------------------------------- On Wed, Jan 2, 2013 at 2:01 PM, Jonathan Moules <[email protected]> wrote: > Hi Simone, > I did use pages 7-9 to decide to go for BigTIFF and so 17-19 isn't > applicable as I'm not going to ImageMosaic. > > While pages 10-13 are useful, its a slideshow and so lacks details which > were probably included in the spoken part of the presentation. Its the > details that I'm looking for. What tile size is best? What resampling > algorithm? What overview size/scales? Etc. > Don't get me wrong, its an excellent document, but it only provides an > overview so can't substitute for actual detailed documentation. > > Your second link answers the tile-size question, but specific for MapServer > (i.e. 256). > > Also, page 11 hints at "external overviews" but there's no indication as to > how to create them or use them with GeoServer. FME can create them as I'm > sure GDAL can too, but again, I don't know how to use External Overviews > with Geoserver. A search of the docs for "external overviews" finds nothing > and a google only finds that PDF. > Does anyone have more information on how to use these with GeoServer? > No worries, actually this feedback gives me some hints on how to update the presentation :) That said, the considerations done for MapServer applies more or less to GeoServer as they are more related to how to geotiff works rather than to how MapServer or GeoServer works. Anyway, my suggestions are as follows: - tile size- 256 or for very large bigtiff 512 is my preferred size. Using a tile size that is too small may result in too many seeks operations on a side and on the other side might result into a TIFF directory explosion. The more tiles we have the more info we need to encode in the TIFF Directory, which is essentially a list of offset locations that tells us where the data is on disk. For bigtiff where we have thousands of tiles it can be MB big. - Resampling - This depends on the data. For RGB like data (orthos and the like) I would gor for higher order interpolation to reduce aliasing (cripsy images). For data like DEM or other data that contains real values to which you will want to apply a color map I would for for Nearest neighbor to NOT introduce artificial values. In some case you might want to use bilinear of average but this depends much on what you want to do. - Overviews - I usually use steps of 2, as many of them as possible although I usually don't create overviews smaller than the tile size - External Overviews - This works only with pure geotiff (or bigtiff as well as the plugin is the same). ImageMosaic does not (yet) support that. External overviews are useful just in case you don't want to touch the original files or in case they do not support inner overviews (which is not the case for geotiff). Creating external overviews can be done with gdaladdo, check this link http://www.gdal.org/gdaladdo.html > I'm fine with no FME specific documentation and wouldn't really expect > any, but because I can't find things in the generic documentation (i.e., any > of the above but especially external overviews), I can't necessarily > implement an optimal solution with any utility, be it FME or GDAL. Let me know if this helps. I will try to update those slides as well as to create some additional docs. You might even want to contribute some doc once you get to where you needed to go :) > > Thanks, > Jonathan > > > On 2 January 2013 11:25, Simone Giannecchini > <[email protected]> wrote: >> >> Ciao Jonathan, >> I don't know about FME therefore I cannot comment on how to do such >> things with it. I hardly believe many people on this list (as well as >> on other OS oriented lists) will know it much. >> This to say that most intructions you'll find will be oriented towards >> OS tools like GDAL utilities rather than towards proprietary solutions >> like FME. >> >> That said, the suggestions you are looking for are inside the document >> andrea suggested (here the link again http://goo.gl/TXJRS): >> >> - slides 7-9 when do use what >> - slides 10-13 how to optimize each single geotiff >> - slides 17-19 how to prepare a mosaic >> >> and so on. >> >> If you check on the web you'll also find other docs that compare tile >> sizes rather than types of compression, e.g. >> http://www.fosslc.org/drupal/content/tuning-gdal-raster-performance >> >> Regards, >> Simone Giannecchini >> == >> Our support, Your Success! Visit http://opensdi.geo-solutions.it for >> more information. >> == >> >> Ing. Simone Giannecchini >> @simogeo >> Founder/Director >> >> GeoSolutions S.A.S. >> Via Poggio alle Viti 1187 >> 55054 Massarosa (LU) >> Italy >> phone: +39 0584 962313 >> fax: +39 0584 1660272 >> mob: +39 333 8128928 >> >> http://www.geo-solutions.it >> http://twitter.com/geosolutions _it >> >> ------------------------------------------------------- >> >> >> On Thu, Dec 27, 2012 at 2:20 PM, Jonathan Moules >> <[email protected]> wrote: >> > Hi list, >> > Following this up, I've decided to go the GeoTIFF/BigTiff route with >> > inner >> > tiling and overviews based on Andrea's document. >> > But unfortunately there doesn't seem to be any documentation on the >> > GeoServer pages about this stuff. I've never used GDAL before and >> > generally >> > avoid the command line (there's a reason we're trying for GeoServer not >> > MapServer ;-) ) so am not sure where to start. >> > >> > My source input is hundreds/thousands of LZW compressed GeoTIFF tiles. >> > These >> > need to be mosaiced together (I can do that in FME easily enough). >> > But then what? Do I compress them at this point? Or inner tiling? Or >> > Overview? Does it matter what order these things are done? >> > And what settings should I use? For instance Andrea's document gives a >> > "blocksize" of 512, but Jukka's comments were on the order of 10,000 and >> > the >> > default is 256. >> > >> > Is there a tutorial out there on this I've failed to find? >> > Thanks, >> > Jonathan >> > >> > >> > On 21 December 2012 14:45, Jonathan Moules >> > <[email protected]> wrote: >> >> >> >> Thanks Andrea, this looks like a very useful document although it is >> >> looking like I'm not going to be able to do this with FME from what I >> >> can >> >> see. >> >> Cheers, >> >> Jonathan >> >> >> >> >> >> >> >> >> >> On 20 December 2012 21:06, Andrea Aime <[email protected]> >> >> wrote: >> >>> >> >>> On Thu, Dec 20, 2012 at 12:16 PM, Jonathan Moules >> >>> <[email protected]> wrote: >> >>>> >> >>>> Hi Jukka, >> >>>> Thanks for the information. >> >>>> >> >>>> Relating to the TIFF's, I'd still prefer to use one single tool >> >>>> (specifically FME) for tile/image creation. FME can create pyramids, >> >>>> but not >> >>>> as part of a GeoTIFF. So I can create separate TIFF files and tile >> >>>> them if >> >>>> necessary too (either internal tiling or regular tiling), but how do >> >>>> I get >> >>>> these into GeoServer? >> >>>> >> >>>> Is there a resource out there which describes the different Raster >> >>>> serving extensions and the advantages/disadvantages of each? >> >>> >> >>> >> >>> Here: >> >>> >> >>> http://demo.geo-solutions.it/share/foss4g2011/gs_steroids_sgiannec_foss4g2011.pdf >> >>> >> >>> Cheers >> >>> Andrea >> >>> >> >>> -- >> >>> == >> >>> Our support, Your Success! Visit http://opensdi.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 >> >>> >> >>> ------------------------------------------------------- >> >> >> >> >> > >> > >> > >> > This transmission is intended for the named addressee(s) only and may >> > contain sensitive or protectively marked material up to RESTRICTED and >> > should be handled accordingly. Unless you are the named addressee (or >> > authorised to receive it for the addressee) you may not copy or use it, >> > or >> > disclose it to anyone else. If you have received this transmission in >> > error >> > please notify the sender immediately. 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