Curtis L. Olson > > One idea would be to generate the entire earth in different levels of > detail and switch based on altitude. At higher altitudes, all your > tiles will likely cover more area and contain less information, so you > could make a scheme like that potentially work. However, then you'd > have to think about how you might hide the transition from one global > LOD to the next ... or maybe just live with a big pop at 10k, 50k, > 100k, etc.???
FWIW Here is some *excellent* global data for a start on this http://earthobservatory.nasa.gov/Newsroom/BlueMarble/ Here is the home page of a viewer http://www.andesengineering.com/BlueMarbleViewer/ an *unsupported* beta native Win32 port lives at http://rockfish.net/~nhv/osg/bmv_mingw.tgz WARNING THE COMPLETE SET OF DATA FILES IS HUGE and will require an additional download of approx 70 MB for the minimal installation and approx 300 meg for the full data set, which uncompresses to ~2.0 GB Note this data is the same resolution as the gtopo30 DEM, 1 km pixels at 'best' LOD, and as distributed has 5 levels of texture LOD which is texture mapped onto an unperturbed sphere, this is suitable for distances of >50 miles or so IMHO If you have got the bandwidth and want a truly *awsome* virtual globe This is a *must* have Enjoy Norman _______________________________________________ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
