David Megginson writes: > > Jonathan Richards writes: > > > listgeo gives a whole shedload of information about the mapping, > > too much to report here unless anyone's interested, in which case > > mail me. > > I'd just like to take another opportunity to express my appreciation > to the U.S. government for making so much geodata available free -- > without their resources and (enlightened) policies, it would be > awfully hard to do any free GIS work, much less a Flight Simulator > (even the international projects are often mainly U.S.-led and > -funded).
Hear hear ! I downloaded one of the charts and yes undeed these are the real thing, to include many introduced colors due to the scanning process. I am not positive but I believe these are originally produced with either 16 or 20 distinct colors only. It is probably worth while finding out, but in any case I managed to produced a significantly smaller disk image by running an adaptive color reducer that recolored the map to use 16 colors and then remaped the white replacement color back to white This reduced the disk size to 17 megs from 40 with very little or no loss in percieved image quality. Note one should be able to get a moving map display out of these by setting up a mapserver http://mapserver.gis.umn.edu and having fgfs output a simple http request at fixed intervals. Of course Atlas could be modified too but it's probably less work to use mapserver since the geotiff support is already builtin Regardless the toughest part of getting this going should be 'collar clipping' the charts so as to get a seamless display :-) Cheers Norman _______________________________________________ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
