[osg-users] osgdem: altitude value of the destination database

[Welsch, Michael, HRD/AB]

Ok, thanks. But one question remains:

If I choose --cs "+proj=latlong +datum=WGS84" as target coordinate system, of which unit is then the z value ? 
Are there any further calculation that has to be done except the multiplication with the matrix to get the value?

My goal is to get the z value as meters (mean sea level), while x/y should be long/lat... 

-----Ursprüngliche Nachricht-----
Von: osg-users-bounces at lists.openscenegraph.org [mailto:osg-users-bounces at lists.openscenegraph.org] Im Auftrag von Robert Osfield
Gesendet: Montag, 23. Juli 2007 18:08
An: osg-users at lists.openscenegraph.org
Betreff: Re: [osg-users] osgdem: altitude value of the destination database

Hi Michael,

osgdem in general works in meters for both x,y and z.  However, you can set the target coordinate system yourself.

Robert.

On 7/23/07, Welsch, Michael, HRD/AB <michael.welsch at mbda-systems.de> wrote:
> Hi,
>
> I'm using osgdem to process heightfields.
>
> The resulting database's VertexArray has values of latitude, longitude 
> in degree (offset defined by the matrix) and an altitude value.
>
> The altitude values are kindly strange. They don't seem to be (kilo) 
> meters or feets (Mean Sea Level).
>
> Does anyone know what type of data the altitude values are (unit, 
> reference point) ?
>
> Example Data:
> 9.66 E 46.33 N, altitude value: 0.0214596633 (should be about 2400m - 
> Mean Sea Level)
>
>
>
> With kind regards,
>
> Michael
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> osg-users mailing list
> osg-users at lists.openscenegraph.org
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>
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