On Tue, 11 Mar 2008 18:29:47 +0100, Ralf wrote in message <[EMAIL PROTECTED]>:
> Hi! > > Arnt Karlsen wrote: > > On Tue, 11 Mar 2008 16:51:16 +0100, gerard wrote in message > > <[EMAIL PROTECTED]>: > >> hmmmm, > >> AS LONG, we have not sea level consistency with OSG sea tiles and > >> sea coastline which makes the the ships flying over. > >> The carriers and others ships are welcome in the the /AI/AIrcraft > >> directory. > > > > ..precisely _how_ do we model the "sea level" surface of water > > bodies like lakes, sea and the oceans right now??? > > Lakes, sea and ocean are quite different things. All areas covered by > the "Landmasss"-theme of VMAP0 are subject to SRTM/USGS elevation > data, so that most lake elevations are based on this data. TerraGear > adjusts the levels of all lake vertices to the same elevation, which > is determined as the mean of the original elevation of the lake > vertices. ..so if I make use of the Northern Norwegian winter heat (an average 5.1 K above normal, some places 8 Kelvin) to raise the oceans, I will not flood the the flooded lakes too now, ok. > IIRC the slope of streams is specifically limited, leading to the > typical cut-ins in some situations.in mountaineous regions. > > Sea and Ocean all have elevation 0 MSL by default, except that the > curvature of the earth is typically less accurately modeled than for > non-ocean tiles. Originally we had simple quads for all-ocean tiles, > but IIRC that has been changed (Tim?) > > All-Ocean tiles - with some exceptions in the polar area - are > generated on the fly by FlightGear. ..and the wet part of the coastal tiles? Dams? > Cheers, > Ralf ..ok, thanks for your brilliantly clear and brief overview, I was hoping somebody would bark me source pointers. ;o) -- ..med vennlig hilsen = with Kind Regards from Arnt... ;o) ...with a number of polar bear hunters in his ancestry... Scenarios always come in sets of three: best case, worst case, and just in case. ------------------------------------------------------------------------- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ _______________________________________________ Flightgear-devel mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/flightgear-devel
