On 4/3/07, Anders Gidenstam wrote:
Hi!
There seems to be an elevation problem in Scandinavia in the 0.9.10 world
scenery: between N60 and N61 the terrain elevation is 0. Everything is
flat. I flew due west from the Baltic sea to the Atlantic at 300ft MSL
along the southern edge of the area without hitting terrain.. The cliffs
were spectacular ;)
Here is an Atlas picture from another user:
http://pics.ww.com/d/48167-1/fgfs-altproblem.png
I don't know if/how far the problem area extends further to the east.
There is also a lake at N60.19 E15.10 (mpmap coordinates) that has
its surface at -580ft in FlightGear. There could be more such strangeness
but this is what I've found so far.
It would be nice if someone who has the raw data handy could check whether
it too has problems in this area or if this is something that went wrong
in the world scenery generation.
There are a couple issues that could be happening here. The SRTM data ends
at +60 latitude. So from that point on up to the north pole, we have to use
a different data set which off the top of my head might be the GLOBE 30
arcsec data set? SRTM also pots out a global 30 arcsec data set which might
have the regions outside of +/- 60 latitude covered from other data sets ...
can't remember now off the top of my head.
There is a point (maybe +62 latitude?) where FlightGear switches tile
widths. This seemed like a good idea at first (and it is for a couple
reasons), but the tile boundaries at this division are not handled correctly
in the code so you can see some missing triangles.
Generally, if altitudes are just plain wrong, we would need to go back and
check the source terrain data ... although there may not be a quick/easy
solution.
Curt.
--
Curtis Olson - University of Minnesota - FlightGear Project
http://baron.flightgear.org/~curt/ http://www.humanfirst.umn.edu/
http://www.flightgear.org
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