Hi there, Thomas Förster wrote: > Am Dienstag 20 Februar 2007 09:57 schrieb Dene: > >>Hi Chris >> >>>Are the landcover db boundaries vector-based? If they are then there >>>is no reason why the terrain could not be created more accurately at >>>those boundaries, for example between land and rivers. >> >>As far s I know, at the moment the land cover is triangle based. ie each >>triangle in the processed terrain is assigned a landcover texture from >>sea, ocean etc to urban etc. This and the simplification of the terrain >>& elevation error limits cause the landcover boundaries to be distorted. > > Depends on what you see as land cover db. The default terrain is created from > SRTM for elevation data and vmap0 for land use (not 100% sure) and the line > features like rivers, roads, railways... > > Unfortunately vmap0 only codes the course of the line features, not their > width. Thats why rivers are uniformly 25 meters wide (except where they are > wide enough to be coded as polygons in vmap0, mostly estuaries), roads are 10 > meters, ...
Is there a free data source that can replace vmap0, that has accurate terrain-type boundaries? > That means there is no way to improve the river shores from the original data > alone. Several people (including me) have created small parts of scenery by > digitizing scanned survey maps, which tremendously increased visual > appearance. Yet time consumption (~30h for a 10x10km area from 1:25.000) and > unclear copyright/terms of use issues don't let it scale well. > > Anyway, Martin Spott already created a data base to collect vector data > contributions and provide a single base for scenery creation. > > http://www.custom-scenery.org/Landcover-DB.212.0.html Kind regards, Chris Wilkinson, Brisbane, Australia. ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys-and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV _______________________________________________ Flightgear-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/flightgear-users
