[glideplan_swproj] Re: Line drawing

  • From: Ales Zita <ala.zita@xxxxxxxxx>
  • To: glideplan_swproj@xxxxxxxxxxxxx
  • Date: Tue, 24 Apr 2012 09:56:21 +0200

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.
> >
> >
> >
>
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