[glideplan_swproj] Re: Line drawing

  • From: Ales Zita <ala.zita@xxxxxxxxx>
  • To: glideplan_swproj@xxxxxxxxxxxxx
  • Date: Tue, 24 Apr 2012 10:36:57 +0200

Hi

yes it's an approximation that should be sufficient in most of the cases
(imho).

A.

2012/4/24 Tomáš Zámečník <pulcik@xxxxxxxx>

> This is not distance on ellipsoid WGS84, but on some sphere with r =
> EARTH_RADIUS_IN_METERS.
> T.
>
> > ------------ Původní zpráva ------------
> > Od: Ales Zita <ala.zita@xxxxxxxxx>
> > Předmět: [glideplan_swproj] Re: Line drawing
> > Datum: 24.4.2012 09:56:34
> > ----------------------------------------
> > Hi
> >
> > I use the following distance calculation in airspaces:
> > have a look at
> >
> https://github.com/updraft/updraft/blob/master/Updraft/src/plugins/airspaces/oaengine.cpp
> > row 509 :
> > double oaEngine::DistanceInMeters()
> >
> > A.
> >
> >
> > 2012/4/24 Tomáš Zámečník <pulcik@xxxxxxxx>
> >
> > > I don't know how to compute distance on WGS84, maybe there are some
> > > routines in osg/osgEarth.
> > > Have you any idea?
> > > Maybe it would be sufficient to subdivide the line with
> > > osgEarth::Symbology::MeshSubdivider to some level (subdivision
> > > step is defined with radians) and somehow take the data from it.
> > >
> > > T.
> > >
> > > > ------------ Původní zpráva ------------
> > > > Od: Kuba Marek <blue.cube@xxxxxxxxx>
> > > > Předmět: [glideplan_swproj] Re: Line drawing
> > > > Datum: 24.4.2012 00:36:21
> > > > ----------------------------------------
> > > > Is there any realistic chance someone is going to use tasks this
> large?
> > > > Because if there is, then I need to fix calculations of task distance
> > > > (now it uses euclidean distance in XYZ, it would probably be better
> to
> > > > use great circle distance)
> > > >
> > > > K
> > > >
> > > > > I found an easy way how to draw lines on the earth surface.
> > > > > It can be done with osgEarth::Symbology::MeshSubdivider, which
> > > > > subdivides (any?) geometry according to ellipsoid surface. It's
> very
> > > > > easy to use - just call one method on your geometry and specify
> > > > > wheter you want to interpolate according to great circle or not.
> ...I
> > > > > send screenshot (in attachment) of declaration of 25000km FAI
> > > > > triangle :-)
> > > > >
> > > > > T.
> > > >
> > > >
> > > >
> > >
> > > To visit archive or unsubscribe, follow:
> > > http://www.freelists.org/list/glideplan_swproj
> > >
> >
> >
> >
>
> To visit archive or unsubscribe, follow:
> http://www.freelists.org/list/glideplan_swproj
>

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