On Mon, Jan 10, 2011 at 8:35 AM, Martin Spott wrote: > from time to time we're adjusting the ground elevations of all object > positions in the Scenemodels-database and thus in the TerraSync- > repository to the actual terrain elevation. Typically this is one of > several preparational steps when people start getting serious about > planning a release :-) > If every of our submitters has properly followed the submission > guidelines at: > > http://scenemodels.flightgear.org/contribute.php > > Hi Martin,
I skimmed the contribute.php link for info on specifying object elevation and had one question. Your approach seems focus on landmarks and buildings that need to sit on top of the ground. But often, important tall objects have a known absolute height ... like a radio tower in an FAA database. For these objects it would be better to keep them at a fixed absolute height rather than float them up or down with different revisions of the terrain. Originally when I populated the world with all the FAA database objects I had the absolute heights in an external database and used that to compute the placement in the .stg files. These generic objects (generic buildings, generic radio towers, etc.) usually protruded well into the ground so they could have their proper above ground height. If we now nudge these objects up and down as the underlying terrain changes we will lose some absolute accuracy in object placement. (And I know that there were some errors in the FAA database that caused things to be misplaced or float where they shouldn't, so I'm not claiming that this original placement was always perfect in every case ... and perhaps we have already gone through a round of adjustments in the past without anyone complaining ... but I would still hate to see these objects that are intended to be placed at an absolute height now be moved up and down as terrain changes.) Thanks, Curt. -- Curtis Olson: http://www.atiak.com - http://aem.umn.edu/~uav/ http://www.flightgear.org - http://www.flightgear.org/blogs/category/curt/<http://www.flightgear.org/blogs/category/personal/curt/>
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