On Monday 08 Sep 2003 16:15, Curtis L. Olson wrote: > Alex Perry writes: > > From: Erik Hofman <[EMAIL PROTECTED]> > > > http://www.a1.nl/~ehofman/fgfs/gallery/test/san_francisco_natural.jpg > > > http://www.a1.nl/~ehofman/fgfs/gallery/test/san_francisco_fgfs.jpg > > > > Someone was complaining about the lake in the middle of the city. > > I suspect it is the age of the vmap dataset that is to be blamed. > > > > There is the long straight dip going towards downtown and also the > > small lake on the San Andreas fault. In real life, both are fairly > > deep dips and were, I suspect, tidal and flooded respectively. > > > > I suspect that, since the vmap data was collected, the dips were drained > > and thereby turned into the parkland that you see in the photo. > > > > A similar effect is visible in San Diego for the Mission Bay area; > > any long term local who sees our scenery immediately knows when the > > vmap0 data was recorded; only recent arrivals refer to it as 'wrong'. > > > > Therefore, I suggest we leave the lake as-is (unless someone who has > > lived in the area for a couple of decades has better historical data). > > I don't think we can have a simple rule to determine which lakes and > > swamps will have been drained or paved over during the last 20-50 years. > > After all the scenery crunching is finished, this area comes out as > type "default". In other words, the vmap0 data has no opinion about > what the coverage is there, but some place it is recorded as "land" so > it is left as "default". > > The real issue here is what texture should we choose for "default" > areas for which vmap0 has no coverage opinion? I would argue that > water or sand is not the best choice. It may work well for a few > specific instances, but then you are going to get lake or water in a > ***lot*** of places where it shouldn't be. > > Instead we need to use an existing ground cover texture or come up > with something that is slightly more generic and nondescript > ... i.e. it could be grassy, or maybe it's trees, we can't quite tell; > and it's not too green, but not too dry, not too rocky, not too > grassy, not too urban, etc. etc. > > Regards, > > Curt. > -- > Curtis Olson HumanFIRST Program FlightGear Project > Twin Cities curt 'at' me.umn.edu curt 'at' flightgear.org > Minnesota http://www.menet.umn.edu/~curt http://www.flightgear.org
Could you not replace all 'default' coverage with one of the coverages bounding the area of default cover? LeeE _______________________________________________ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
