[glideplan_swproj] Re: [glideplan_swproj] Re: Line drawing

  • From: Tomáš Zámečník <pulcik@xxxxxxxx>
  • To: glideplan_swproj@xxxxxxxxxxxxx
  • Date: Tue, 24 Apr 2012 10:18:31 +0200 (CEST)

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
> >
>
>
>

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