Hi Robert, Thanks for clarification. I have thought --geocentric options generally using for spherical terrain like whole earth terrain database (i.e bluemarble world) and --terrain option for flat terrain. And have used both option seperately to create terrain but haven't tried both of them. So I misunderstood usage.
Regards. 2008/12/12 christophe loustaunau <[email protected]> > Hi, > > I have test your data and there is strange things. > If I use this command line : > osgdem --terrain --geocentric -t hillsmall -o hillsmall.ive > osgdem reproject the two Geotiff and create two temporary files. But it > seems not to use it, as in the output database > the tiles no not line up. > > But if you put these two temporary files into the directory /hillsmall and > run again osgdem with the same command line > osgdem --terrain --geocentric -t hillsmall -o hillsmall.ive > The output database is ok, everything lines up ! (see the sceenshot). > > I think osgdem do not use the temporary files, but I don't know why. Maybe > you could debug it. > Anyway, you could reproject you files and then everything will work fine ! > > Hope this help. > > Regards. > > > On Fri, Dec 12, 2008 at 7:46 PM, Tueller, Shayne R Civ USAF AFMC 519 > SMXS/MXDEC <[email protected]> wrote: > >> All, >> >> I finally have two small Geotiff tiles (1m resolution) that I've >> experimented with to examine this problem. I run them through VPB and they >> first get reprojected (via GDAL I presume) into temporary files. I then >> load >> the two temporary reprojected files into OpenEV for examination and they >> still appear to line up as they did before being reprojected. That would >> seem to suggest that the problem isn't with the reprojection step (or what >> GDAL is doing). >> >> Once VPB installs them into the database, they do NOT line up as I have >> shown in my previous email with the screen capture. This would suggest >> that >> VPB is doing something that is shifting them off so they don't align. >> >> I've attached the two GeoTiff tiles if anyone wants to reproduce this >> problem. >> >> Using VPB, I'm issuing the command: >> >> osgdem --TERRAIN --PagedLOD --geocentric -t hillsmall -l 8 -o >> hillsmall.ive >> >> The "hillsmall" directory contains the two tiles. Interestingly, when I >> remove the "--geocentric" flag from the above command, things look fine >> for >> a flat database and the tiles align (which isn't surprising). It's almost >> as >> if the spheroid between the tiles and what VPB is using are not matched. >> >> Any ideas on what's going on? >> >> -Shayne >> >> -----Original Message----- >> From: [email protected] >> [mailto:[email protected]] On Behalf Of J.P. >> Delport >> Sent: Wednesday, December 10, 2008 11:39 PM >> To: OpenSceneGraph Users >> Subject: Re: [osg-users] discontinuity in texture in VPB... >> >> Hi, >> >> I'd also suggest what Christophe said. Do the projection of some tiles >> manually before VPB is run. I normally use something like: >> >> gdalwarp -t_srs "+proj=latlong +datum=WGS84" -r bilinear $name >> ../reprojected/$newname >> >> Then load the tiles into something like QGIS (http://www.qgis.org/) to >> see if they line up. >> >> jp >> >> christophe loustaunau wrote: >> > Hi Shayne, >> > >> > Maybe you could reproject your imagery to a geographic projection with >> > gdal (gdal_translate) and see if you have the same artifact. >> > You will know if it's a VPB or a gdal reprojection problem. >> > >> > On Wed, Dec 10, 2008 at 6:14 PM, Tueller, Shayne R Civ USAF AFMC 519 >> > SMXS/MXDEC <[email protected] >> > <mailto:[email protected]>> wrote: >> > >> > I've built a geocentric database using VBP 0.9.7. <http://0.9.7.> >> > The imagery is GeoTiff tiles that are NAIP 1 meter UTM and the >> > elevation is DTED level 1. The GeoTiffs appear to be reprojected by >> > VPB (I assume using GDAL internally) for the geocentric database >> > setting. Things appear to build just fine without error but when I >> > view the database in OSG, I see a nasty discontinuity across texture >> > tile boundaries. You can clearly see this in the airfield picture >> > that is attached. The landing strip does not line up across the tile >> > boundary. I've verified that the tiles themselves are correct across >> > boundaries before I fed them into VPB. The discontinuity appears >> > regardless of the LOD that is being paged in. >> > >> > >> > >> > My question is, is this an artifact that I must live with since the >> > original imagery is based in UTM and the reprojection that VPB does >> > (or GDAL) introduces inaccuracies when going to a geocentric >> > database? Is there something else I can do to eliminate these >> > discontinuities? >> > >> > >> > >> > Any input or ideas anyone can suggest to eliminate these >> > discontinuities in the database would be welcome. >> > >> > >> > >> > Thanks, >> > >> > -Shayne >> > >> > >> > _______________________________________________ >> > osg-users mailing list >> > [email protected] >> > <mailto:[email protected]> >> > >> http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org >> > >> > >> > >> > >> > -- >> > Christophe Loustaunau. >> > >> > >> > ------------------------------------------------------------------------ >> > >> > _______________________________________________ >> > osg-users mailing list >> > [email protected] >> > >> http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org >> >> -- >> This message is subject to the CSIR's copyright terms and conditions, >> e-mail >> legal notice, and implemented Open Document Format (ODF) standard. >> The full disclaimer details can be found at >> http://www.csir.co.za/disclaimer.html. >> >> This message has been scanned for viruses and dangerous content by >> MailScanner, >> and is believed to be clean. MailScanner thanks Transtec Computers for >> their support. >> >> _______________________________________________ >> osg-users mailing list >> [email protected] >> http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org >> >> _______________________________________________ >> osg-users mailing list >> [email protected] >> http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org >> >> > > > -- > Christophe Loustaunau. > > _______________________________________________ > osg-users mailing list > [email protected] > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org > > -- Ümit Uzun
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