Hi, After different positive results using VPB to generate world databases (at 450m/150m imagery resolution and 300m/200m DEM resolution), we have tried something more ambitious. Our input data are now :
- a world imagery cover at 0.5s (~15m) : 72 ECW files ~ 94 GB - a world DEM cover at 3s (~90m) : 871 GeoTiff files ~ 60 GB Here is the command line script used under Windows : Code: SET PATH=%PATH%;.\VPB SET GDAL_DATA=.\VPB\data vpbmaster^ -t H:\World_0s5_ECW^ -d H:\World_3s_TIF^ --splits 6 10^ --geocentric^ --no-mip-mapping^ --terrain^ --RGB-24^ -O "compressImageData JPEG_QUALITY 75"^ -o World15m\world15m.ive We read data from external USB 2 drives but write output to the local HD. Depending on the machine and whether we use DEM or not, the approximated time to completion is huge (10-60 days), but we can go along with it. However, after a few days of computation the approximated time stops decreasing or even worse it starts to increase. We think this might be due to the large amount of files generated (after 70h more than one million files are there), getting into disk/system overload as a result. We have also tried onto a Linux system but without a really more effective processing. I am not so familiar with VPB source code, so I prefer to look for advices here before going into a more detailed understanding. First of all, how is the approximated time to completion computed and how is it accurate ? Then, as far as I can see, using a cluster should not help us to manage the file problem even if it can stretch timing a little bit. At last, I do not know if someone has already tried to generate such a big database but what will be your advices to manage this more efficiently ? If not possible, we will probably try the online way to go (osgEarth)... Thank you! Cheers, Luc ------------------ Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=22451#22451 _______________________________________________ osg-users mailing list [email protected] http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
