Hi, Robert
Thank you for your kind reply, I will try GDAL to solve the problem.
Tianyun
From: Robert Osfield
Date: 2013-08-01 14:41
To: osg-users
Subject: Re: [osg-users] geographic coordinate convert
Hi Tianyun,
The OSG itself doesn't manage mercator projections, so if you want to
covnert being different coordinate systems then you are best using a
3rd party library like GDAL.
What osg::EllipsoidModel can do is handle the whole earth ellisoid and
converson of lats/long to Earth Center Earth Fixed, this is sufficent
for most whole terrain databases and why the OSG specifically supports
it.
Robert.
On 24 April 2013 08:47, Tianyun Su <[email protected]> wrote:
> Hi,
> I use osgdem to create an IVE model with mercator projection and can load the
> model in my OSG program. I want to realize such funciton:
> (1) input the WGS84 coordinate (lon, lat) of target point
> (2) calculate the elevation (z) of the point from the terrain file
> (3) draw a graphic object at the point (lon, lat, z)
> The problem is how to convert the WGS84 coordinate of inputted point to
> mercator projection which is used in my OSG program.
>
> I have used the folllowing method:
>
>
> Code:
> osg::ref_ptr<osg::CoordinateSystemNode> csn=new osg::CoordinateSystemNode;
> csn->setEllipsoidModel(new osg::EllipsoidModel);
> csn->addChild(terrain);//"terrain" is IVE model with mercator projection
> double o,p,q;
> csn->getEllipsoidModel()->convertLatLongHeightToXYZ(osg::DegreesToRadians(80.0),osg::DegreesToRadians(115.0),osg::DegreesToRadians(0.0),o,p,q);
>
>
> The convert value (o,p,q) is not correct.
> How can I realize the function?
>
> Thank you!
>
> Cheers,
> tianyun[/code]
>
> ------------------
> Read this topic online here:
> http://forum.openscenegraph.org/viewtopic.php?p=53776#53776
>
>
>
>
>
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