Simone, Thanks, that link is helpful.
Is there any way to get the metadata information from the MrSID file such as the number of zoom levels? getNumOverviews always seems to return 0, but if I use the MrSIDImageReader (with a MrSIDImageReaderSPI), the number of overviews is properly computed. Thanks, Jeff -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Simone Giannecchini Sent: Thursday, December 16, 2010 5:22 AM To: Jeff Storey Cc: [email protected] Subject: Re: [Geotools-gt2-users] Displaying MrSID images Ciao Jeff, I guess I would need to look at the code you are writing in order to be helpful. Anyway, what you need to do is to make use of the Read_gridgeometry read parameter of the MRsidReader with the envelope and pixel dimensions needed. See code below, where you have code to set many parameters to control the reading process: http://pastebin.com/EYmqMgGZ if you are using the geotools renderer, it should handle that seamelessly. I think I would avoid conversions and things like that, especially with jpeg and png. Simone. ------------------------------------------------------- Ing. Simone Giannecchini GeoSolutions S.A.S. Founder Via Poggio alle Viti 1187 55054 Massarosa (LU) Italy phone: +39 0584962313 fax: +39 0584962313 mob: +39 333 8128928 http://www.geo-solutions.it http://geo-solutions.blogspot.com/ http://www.linkedin.com/in/simonegiannecchini http://twitter.com/simogeo ------------------------------------------------------- On Tue, Dec 14, 2010 at 9:26 PM, Jeff Storey <[email protected]> wrote: > Simone, > > I have a mapping application and the user might load in file xyz.sid for > example. Let's say that file is 4000x4000 pixels and spans 10 deg lat-11 deg > lat and 10 deg lon-11 deg lon. If the user is zoomed in on a region that is > only showing 10.2lat-10.4lat and 10.1lon-10.2lon at 800x400 pixels, I want to > show only that region and zoomed in. My current approach is to take the grid > coverage for the entire image and then create a smaller coverage based on the > envelope the user is currently viewing. I can then upsample or downsample the > image as needed to get a higher or lower resolution. Then I get the rendered > image from the grid coverage and display it as a png that the user can view > on the map. > > Does this approach make sense? Is there a more efficient way to do this? > > Thanks, > Jeff > > -----Original Message----- > From: [email protected] [mailto:[email protected]] On Behalf Of Simone > Giannecchini > Sent: Tuesday, December 14, 2010 1:16 PM > To: Jeff Storey > Cc: [email protected] > Subject: Re: [Geotools-gt2-users] Displaying MrSID images > > Ciao Jeff, > I am not sure what you mean. > Can you please describe a litlle bit better what you are trying to do? > > Ciao, > Simone. > ------------------------------------------------------- > Ing. Simone Giannecchini > GeoSolutions S.A.S. > Founder > > Via Poggio alle Viti 1187 > 55054 Massarosa (LU) > Italy > > phone: +39 0584962313 > fax: +39 0584962313 > mob: +39 333 8128928 > > > http://www.geo-solutions.it > http://geo-solutions.blogspot.com/ > http://www.linkedin.com/in/simonegiannecchini > http://twitter.com/simogeo > > ------------------------------------------------------- > > > > On Mon, Dec 13, 2010 at 11:47 PM, Jeff Storey > <[email protected]> wrote: >> Hi, >> >> >> >> I've used the MrSIDImageReader to successfully read in a MrSID image. >> However, now I would like to display it in my application. I'm trying to >> figure out if the best thing to do is to convert it to another format (such >> as jpg or png) at given resolution or scale. I'm not actually even sure how >> to do that quickly either. Is there anyone that has actually displayed the >> MrSID contents from within their application? Any tips on how to proceed >> would be greatly appreciated. >> >> >> >> Thanks, >> >> Jeff >> >> >> >> ------------------------------------------------------------------------------ >> Lotusphere 2011 >> Register now for Lotusphere 2011 and learn how >> to connect the dots, take your collaborative environment >> to the next level, and enter the era of Social Business. >> http://p.sf.net/sfu/lotusphere-d2d >> _______________________________________________ >> Geotools-gt2-users mailing list >> [email protected] >> https://lists.sourceforge.net/lists/listinfo/geotools-gt2-users >> >> > > ------------------------------------------------------------------------------ > Lotusphere 2011 > Register now for Lotusphere 2011 and learn how > to connect the dots, take your collaborative environment > to the next level, and enter the era of Social Business. > http://p.sf.net/sfu/lotusphere-d2d > _______________________________________________ > Geotools-gt2-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/geotools-gt2-users > ------------------------------------------------------------------------------ Lotusphere 2011 Register now for Lotusphere 2011 and learn how to connect the dots, take your collaborative environment to the next level, and enter the era of Social Business. http://p.sf.net/sfu/lotusphere-d2d _______________________________________________ Geotools-gt2-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/geotools-gt2-users
