Re: [Flightgear-devel] Lakes
I've just downloaded e000n40.tar.gz scenery file from William's site to discover that lakes are missing there too. The bigger ones that appears in Curt's scenery (like the Lake of Geneva) are now flagged as Default (green) and not Lake (blue). Otherwise, I never saw such a detailed scenery for my home town in whatever sim. Thanks to William, David and vmap0. I have two remarks : 1. rivers are all the of same width, 2. the data set is somewhat misplaced by a fraction of kilometer : I discovered this with fgsd ( screenshot here : http://perso.wanadoo.fr/frbouvi/flightsim/fgsd-vmap0-ann.png ) I presume the map is placed correctly because airports match perfectly. You can see that the shape of the river match but is offset by a small amount. There is also a lake that does not appear. perhaps it is not in the dataset ! It result in rivers climbing mountains or railroads crossing airfields. I don't know if this error can be compensate because I only have one area to look at. Maybe someone can do the same with its area and tell how much the data is off. Here, the difference is about 20 seconds in both longitude and latitude. Cheers, -Fred - Original Message - From: William L. Riley [EMAIL PROTECTED] To: [EMAIL PROTECTED] Sent: Thursday, September 05, 2002 10:36 PM Subject: Re: [Flightgear-devel] Lakes On Thursday 05 September 2002 03:17 pm, David Megginson wrote: Done. Please confirm that the lakes are there now. I am seeing them after a cvs update. Thanks David. *Dunce cap firmly in place* ;) -- William L. Riley [EMAIL PROTECTED] ___ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel ___ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
Re: [Flightgear-devel] Lakes
Frederic Bouvier writes: I've just downloaded e000n40.tar.gz scenery file from William's site to discover that lakes are missing there too. The bigger ones that appears in Curt's scenery (like the Lake of Geneva) are now flagged as Default (green) and not Lake (blue). That could be the result of any of several problems. Lake Geneva is almost certainly in vmap, but perhaps there was a triangulation problem, or perhaps e000n40 was one of William's early efforts, before he nailed down the water stuff. If you remind me, I can try generating it next week and see what I get here. Otherwise, I never saw such a detailed scenery for my home town in whatever sim. Thanks to William, David and vmap0. I'm glad it helped. I have two remarks : 1. rivers are all the of same width, Yes. Unfortunately, vmap0 models smaller rivers and streams as lines, so we don't know how wide to make them. In the future, we might make the shorelines irregular, at the cost of more polygons 2. the data set is somewhat misplaced by a fraction of kilometer : I discovered this with fgsd ( screenshot here : http://perso.wanadoo.fr/frbouvi/flightsim/fgsd-vmap0-ann.png ) I presume the map is placed correctly because airports match perfectly. You can see that the shape of the river match but is offset by a small amount. There is also a lake that does not appear. perhaps it is not in the dataset ! It result in rivers climbing mountains or railroads crossing airfields. Yes, that does happen. Both the DEM and vmap0 data are fairly low resolution, so problems like this will happen. For the Great Lake shorelines, the error in vmap0 is only 10 or 20 metres, vs. 1000m for the GSHHS, but the errors are still there. As Norm has pointed out, the solution will be to load everything into a GIS database and then tweak the data manually where necessary (and run some automated tweaks as well). Unfortunately, we're not set up for that yet. All the best, David -- David Megginson, [EMAIL PROTECTED], http://www.megginson.com/ ___ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
Re: [Flightgear-devel] Lakes
From: David Megginson [EMAIL PROTECTED] Frederic Bouvier writes: I've just downloaded e000n40.tar.gz scenery file from William's site to discover that lakes are missing there too. The bigger ones that appears in Curt's scenery (like the Lake of Geneva) are now flagged as Default (green) and not Lake (blue). That could be the result of any of several problems. Lake Geneva is almost certainly in vmap, but perhaps there was a triangulation problem, or perhaps e000n40 was one of William's early efforts, before he nailed down the water stuff. If you remind me, I can try generating it next week and see what I get here. I can see the outlines of lakes but they are dry and replaced with the Default material. Cheers, -Fred ___ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
